Resfriados (con fiebre)

5-HTP is the direct precursor to serotonin and readily crosses the blood-brain barrier, increasing CNS serotonin synthesis. Clinical and preclinical evidence supports its use for depression, anxiety, sleep, and other conditions regulated by serotonin. It bypasses the rate-limiting step of tryptophan conversion.

Acetyl-L-Carnitine (ALC) exerts neuroprotective, neurotrophic, antidepressive, and analgesic effects in painful neuropathies. It acts as a precursor for acetylcholine and supports mitochondrial energy metabolism in neurons. Multiple peer-reviewed studies and systematic reviews confirm its role in neuroinflammation and neurodegenerative conditions.

Agmatine is an endogenous neurotransmitter/neuromodulator derived from arginine that regulates multiple neurotransmitter systems in the CNS, including NMDA receptor function, imidazoline receptors, and nitric oxide synthesis. Clinical studies support its role in neuropathic pain and neurological protection.

ALA supports nervous system function through neuroprotective, anti-neuroinflammatory, and neurotrophic mechanisms. It protects against brain ischemia, reduces neurodegeneration, and supports synaptic plasticity via BDNF/TrkB signaling pathways.

Alpha-Lipoic Acid is a potent endogenous antioxidant cofactor with well-documented clinical evidence for neuroprotection, particularly in diabetic peripheral neuropathy. The ALADIN and SYDNEY clinical trials demonstrated significant symptom relief and improvement in nerve conduction velocity.

DHA is an essential structural component of neuronal membranes throughout the nervous system and is critical for normal development and maintenance of neuronal function. Deficiency of DHA in the nervous system is associated with multiple neurological and psychiatric conditions. Algal oil provides a direct source of DHA that supports neuronal membrane integrity and neurotransmitter signaling.

Anchovies supply DHA — the dominant structural fatty acid of neuronal membranes — as well as vitamin B12, niacin, and selenium, all critical for neurological function. EPA and DHA are integral to maintaining neuronal cell membrane fluidity and neurotransmission. Vitamin B12 supports myelin sheath synthesis and nerve conduction.

Anemarrhena constituents exert significant pharmacological effects on the nervous system, including neuroprotection, AChE inhibition, anti-neuroinflammation, and memory enhancement across multiple preclinical models. Timosaponin B-II, AIII, sarsasapogenin, and mangiferin all contribute to nervous system-relevant activities.

Ashwagandha (Withania somnifera) is a cornerstone of Ayurvedic medicine with extensively documented neuroprotective and adaptogenic properties. Withanolides and sitoindosides modulate the HPA axis, GABAergic signaling, and NF-κB pathways, and clinical trials show improvements in cognitive performance and stress biomarkers.

D-aspartic acid is an endogenous constituent of the vertebrate nervous system, with a documented role in nervous system development and neuroendocrine signaling. It is concentrated in brain regions including the frontal cortex and hippocampus, and plays functional roles via NMDA receptor activation in synaptic plasticity. Animal studies document effects on memory and cognition linked to hypothalamic D-Asp concentrations.

Astaxanthin is a potent carotenoid antioxidant that crosses the blood-brain barrier and blood-retinal barrier, demonstrating neuroprotective properties in preclinical and human studies. Clinical trials show benefits for cognitive function, neural fatigue, and neuroprotection against oxidative stress.

Baccosides (variant spelling of bacosides) are the primary bioactive saponins of Bacopa monnieri responsible for memory and nervous system effects. Clinical trials standardized to baccosides confirm improved memory and neuroprotective effects.

Bacopa monnieri has been used in Ayurvedic medicine for centuries to enhance cognitive function. It modulates the cholinergic system, offers neuroprotective effects in the hippocampus, and multiple human trials show improved memory and reduced anxiety. Its active bacosides are linked to enhanced BDNF and acetylcholine activity.

Bacopin is a proprietary standardized extract of Bacopa monnieri containing defined levels of bacosides, the active compounds responsible for cognitive and nervous system effects. Clinical trials using this standardized form confirm improved memory and neuroprotective benefits.

Bacosides are the primary bioactive saponins of Bacopa monnieri responsible for its memory-enhancing and neuroprotective effects. They modulate the cholinergic system, reduce oxidative stress in the hippocampus, and human clinical trials confirm their cognitive benefits.

Benfotiamine is a fat-soluble form of vitamin B1 (thiamine) with superior bioavailability that has been specifically studied for diabetic peripheral neuropathy. Clinical trials demonstrate improvements in neuropathic symptoms and nerve conduction in diabetic patients.

Biota seed's bioactive components—saponins, essential oils, and flavonoids—modulate multiple neurochemical targets including serotonergic, GABAergic, and monoaminergic systems in preclinical models. These findings support its traditional classification as a 'Shen-calming' herb with genuine nervous system activity. Human clinical data remain unavailable.

Bovine heart provides vitamin B12 in high concentration (~8.55 µg/100 g), essential for myelin sheath integrity, neurotransmitter synthesis, and neuronal function. Deficiency of B12 causes peripheral neuropathy and neurological decline. CoQ10 has also been investigated as a neuroprotective agent.

Bovine liver's B12, folate, B6, choline, and niacin are each documented as essential for nervous system structure and function. B12 is required for myelin synthesis; deficiency causes demyelination of the spinal cord and peripheral nerves. Choline is a precursor to acetylcholine. Niacin deficiency causes pellagra with neurological manifestations.

DHA is the primary structural omega-3 in neuronal membranes throughout the nervous system, governing membrane fluidity, synaptic function, and neuroprotection. Calamari oil, as a concentrated DHA source, directly supports neuronal structural integrity. Clinical evidence confirms omega-3 importance in nervous system development, function, and preservation across the lifespan.

Centella asiatica (Gotu kola) is extensively documented in Ayurvedic medicine for nervous system support and cognitive enhancement. Its triterpene constituents stimulate neurite outgrowth, support myelination, and multiple human trials confirm cognitive and anxiolytic benefits.

Choline is an essential nutrient for nervous system health, serving as a precursor for acetylcholine synthesis—a critical neurotransmitter for memory, muscle control, and cognition. Inadequate choline is associated with cognitive dysfunction, and significant evidence shows its importance for healthy brain function.

Citicoline (CDP-choline) is an essential intermediate in phosphatidylcholine biosynthesis in neuronal cell membranes, crosses the blood-brain barrier, and increases brain metabolism and neurotransmitter levels. Clinical trials and meta-analyses support its neuroprotective role in traumatic brain injury, stroke, and cognitive decline.

Copper is essential for myelination of the brain and spinal cord, neurotransmitter synthesis (via dopamine β-hydroxylase and peptidylglycine amidating monooxygenase), and synaptic transmission. Copper deficiency causes myelopathy, peripheral neuropathy, and demyelination. These effects are documented in human case series and clinical studies.

CoQ10 is an endogenous mitochondrial electron carrier essential for neuronal energy production. It has been clinically studied for neuroprotective effects in Parkinson's disease, migraine prevention, and protection against oxidative stress-mediated neurodegeneration.

Cowage seed has ancient Ayurvedic use as a nerve tonic and modern human clinical trial evidence supporting its role in Parkinson's disease — a primary nervous system disorder. A 2025 systematic review of clinical trials confirmed consistent improvements in PD motor symptoms. Preclinical studies show neuroprotection, anti-neuroinflammation, and acetylcholinesterase inhibition.

Curcumin, the primary bioactive of turmeric, crosses the blood-brain barrier and has been extensively studied for neuroprotection. Multiple clinical trials and meta-analyses demonstrate improvements in mood, memory, and biomarkers of neurodegeneration, mediated through anti-inflammatory and antioxidant mechanisms.

Alpha-tocopherol is essential for neurological function: hereditary deficiency causes spinocerebellar ataxia in humans, correctable by high-dose supplementation. It protects neuronal membranes from lipid peroxidation and supports neuromuscular integrity. The NIH identifies protection of neuromuscular function as the primary health-promoting property of vitamin E in humans.

D-Asp is an endogenous amino acid with a documented role in nervous system development and function. It occurs transiently at high concentrations in the embryonic and early postnatal brain, where it is implicated in neurogenesis and neural differentiation. It is found in synaptosomes and synaptic vesicles and fulfills several classical neurotransmitter criteria.

Damiana has well-documented preclinical effects on multiple nervous system targets: GABA-A receptor modulation, MAO-B inhibition, dopamine and noradrenaline reuptake inhibition, and glutamate receptor antagonism. The British Herbal Pharmacopoeia lists it as a nerve tonic. No human neurological studies exist.

DHA is a long-chain omega-3 fatty acid that is the dominant structural lipid in the brain and retina, essential for neuronal membrane fluidity, neurotransmitter release, and nervous system development. Deficiency is linked to impaired cognition, learning, and behavior across the lifespan.

EGCG is one of the most studied natural neuroprotective compounds, inhibiting amyloid-beta and alpha-synuclein aggregation, reducing neuroinflammation, promoting mitochondrial health, and activating neuronal survival pathways. Clinical studies demonstrate reductions in neurodegenerative biomarkers and improvements in cognitive and motor function.

EPA contributes to nervous system health by reducing neuroinflammation, modulating neurotransmitter systems, and supporting myelin and neuronal membrane integrity. Clinical evidence spans depression, anxiety, ADHD, and cognitive function, with EPA identified as the anti-inflammatory omega-3 most relevant to neuropsychiatric outcomes.

EPA is a marine omega-3 fatty acid with potent anti-inflammatory properties relevant to nervous system health, particularly through modulating neuroinflammation. Evidence supports its role in depression, mood disorders, and nervous system inflammation reduction.

Eucommia extracts exhibit documented neuroprotective activity across multiple models including Parkinson's, Alzheimer's, stroke, and oxidative stress-induced neuronal death. Active mechanisms include Nrf2 pathway activation, NLRP3 suppression, cholinergic enhancement, and dopaminergic neuroprotection.

Fisetin is a well-documented neuroprotective flavonoid in preclinical models, protecting against neurodegeneration via antioxidant, anti-inflammatory, and senolytic mechanisms across multiple nervous system diseases. One human clinical trial in ischemic stroke has been conducted.

EPA and DHA from fish oil are essential structural and functional components of neuronal cell membranes throughout the central and peripheral nervous system. DHA is highly concentrated in neuronal synapses, myelin sheaths, and the brain gray matter, supporting neurotransmission, myelination, and neuroprotection. Deficiency is associated with neurological impairments across the lifespan.

Folic acid is an essential B vitamin (B9) critical for nervous system development and maintenance, particularly for DNA synthesis and methylation reactions supporting neurotransmitter production. Deficiency causes neural tube defects and is associated with neurological symptoms and elevated homocysteine damaging nerve tissue.

Folinic acid is essential for nervous system integrity through its roles in myelin synthesis, neurotransmitter methylation, and neuronal DNA replication. Cerebral folate deficiency—treated with folinic acid—produces leukodystrophy, neuropathy, and neurological regression. Evidence from both inborn-error disease management and observational data in aging populations supports folate's critical role in maintaining nervous system health.

Multiple preclinical studies and a comprehensive 2022–2023 literature review have documented neuroprotective properties of Forsythia suspensa active components, particularly forsythoside A. Relevant conditions studied include Alzheimer's disease, Parkinson's disease, ischemic stroke, and peripheral neuropathy. All evidence is from animal/in vitro studies; human clinical trials are absent.

Poria cocos interacts with GABAergic, serotonergic, and dopaminergic systems in preclinical models, supporting sedative, anxiolytic, antidepressant, and neuroprotective functions. Polysaccharides protect hippocampal neurons in Alzheimer's models, and the herb appears in the Chinese Pharmacopoeia for neurological indications.

GABA is the principal inhibitory neurotransmitter in the central nervous system, present in approximately 25–50% of CNS neurons. It plays a major role in spinal motor networks, seizure suppression, and modulation of neuronal excitability. Oral GABA supplement research is ongoing regarding blood-brain barrier penetration.

Ginkgo biloba is one of the most researched herbal medicines for cognitive health, used in Traditional Chinese Medicine for thousands of years. Standardized extract EGb 761 improves cerebral blood flow, has potent antioxidant properties protecting brain cells, and shows moderate evidence for managing dementia symptoms.

Ginseng (Panax ginseng) has centuries of use in Traditional Chinese Medicine to tonify the nervous system and enhance mental function. Ginsenosides—the primary active compounds—modulate multiple neurotransmitter systems, support neuroplasticity, and clinical trials document cognitive and neuroprotective benefits.

Ginsenosides are the primary bioactive compounds in Panax ginseng responsible for its neuroprotective and cognitive-enhancing effects. They modulate multiple neurotransmitter systems, promote NGF expression, and protect neurons against excitotoxicity and amyloid toxicity in preclinical and clinical studies.

GLA and its metabolites are required for normal neuronal membrane structure, nerve blood flow, and impulse conduction. Diabetics have impaired GLA synthesis and develop neuropathy partly due to GLA deficiency. Multiple controlled trials show GLA supplementation significantly improves neurophysiological parameters in diabetic neuropathy.

Glycine is a primary inhibitory neurotransmitter in the spinal cord and brainstem, acting through glycine-gated chloride channels (GlyRs), and a mandatory co-agonist at NMDA receptors throughout the brain. Systematic review of 52 human studies found the nervous system showed the most positive and consistent effects of glycine administration, including improved psychiatric symptoms in clinical populations.

Gotu kola (Centella asiatica) has been used in Ayurvedic and traditional Asian medicine for millennia for nervous system toning and cognitive enhancement. Its triterpenoids (asiaticoside, asiatic acid) support neuronal regeneration, myelination, and cognitive function in human trials.

Glycerophosphocholine (GPC, alpha-GPC) is a highly bioavailable choline compound that crosses the blood-brain barrier and serves as a precursor to acetylcholine, supporting neuronal membrane integrity and cognitive function. Clinical trials show improvements in Alzheimer's disease symptoms and cognitive performance.

Guarana is a well-documented CNS stimulant via caffeine-mediated adenosine receptor antagonism. Animal studies show neuroprotective properties and anxiolytic effects involving serotonergic and dopaminergic systems. Guarana has also been shown in preclinical models to reduce neuronal oxidative stress and protect against hyperlipidemia-induced cognitive impairment.

Hericenones are bioactive compounds unique to Lion's Mane mushroom fruiting body that stimulate Nerve Growth Factor (NGF) synthesis in the nervous system. Preclinical studies strongly support their neurotrophic role, and they represent the primary active fraction responsible for Lion's Mane's nervous system benefits.

Hericium erinaceus (Lion's Mane mushroom) is extensively documented in Traditional Chinese Medicine for supporting nervous system health. Its bioactive hericenones and erinacines stimulate NGF synthesis, with preclinical and emerging clinical evidence for neuroprotection and cognitive support.

Hops exerts well-documented central nervous system depressant effects via GABA-A receptor modulation, melatonin receptor binding, and serotonin receptor interaction. These have been verified in animal behavioral models and are consistent with clinical observations of sedation and sleep improvement. Alpha-acids, particularly humulone, are the primary active constituents.

Huperzine A is a potent, highly specific, reversible acetylcholinesterase inhibitor isolated from Huperzia serrata that also acts as an NMDA receptor antagonist with neuroprotective properties. Clinical trials in China demonstrated significant relief of memory deficits in aged subjects, Alzheimer's disease, and vascular dementia patients.

Hypericum (St. John's Wort) is one of the most extensively studied herbal medicines for nervous system conditions, particularly mild-to-moderate depression. Multiple Cochrane meta-analyses confirm superiority to placebo and comparable efficacy to antidepressants.

Inositol is a carbocyclic polyol that plays roles as a secondary messenger in nervous system signal transduction and has been studied clinically for anxiety, depression, OCD, and panic disorder. Myo-inositol is a key component of phosphatidylinositol in neuronal membranes.

Kava (Piper methysticum) is a traditional Pacific Island beverage used for centuries for its anxiolytic and nervous system calming effects. Kavalactones have been shown in multiple RCTs to reduce anxiety through GABA-A receptor modulation, with evidence comparable to low-dose benzodiazepines.

Kavalactones are the primary bioactive compounds of kava responsible for its anxiolytic and nervous system-calming properties. They modulate GABA-A receptors, inhibit voltage-gated ion channels, and multiple RCTs confirm their efficacy for anxiety reduction.

L-asparagine is essential for nervous system development and function, as demonstrated by asparagine synthetase deficiency (ASNSD), a rare neurometabolic disorder causing congenital microcephaly, epileptic encephalopathy, and progressive cerebral atrophy. Brain cells depend on local asparagine synthesis because dietary L-asparagine cannot freely cross the blood-brain barrier. Asparagine also serves as a precursor to aspartate, a neuromodulator involved in excitatory signaling throughout the CNS.

L-carnosine is concentrated in the brain and nerve tissue where it exerts neuroprotective, antioxidant, anti-inflammatory, and metal-chelating effects. Clinical evidence includes improved cognitive outcomes in elderly RCTs and a pilot trial in Parkinson's disease. Preclinical evidence is extensive across models of ischemia, neurodegeneration, and neuroinflammation.

De novo synthesis of L-serine is essential for central nervous system development and function. Genetic defects in L-serine biosynthetic enzymes cause severe neurological disease including microcephaly, seizures, intellectual disability, and spastic quadriplegia—all substantially improved or prevented by L-serine supplementation. L-serine also promotes remyelination, inhibits neuroinflammation, and supports neurotrophic signaling.

L-Theanine is a green-tea amino acid that crosses the blood-brain barrier and affects the CNS through multiple pathways, including increasing GABA release, inhibiting glutamate formation, and exerting antidepressant and mood-enhancing effects. Meta-analyses of RCTs support its role in cognitive function.

L-Threonine raises glycine levels in the central nervous system by serving as its precursor, and glycine is an inhibitory neurotransmitter in the spinal cord. Multiple double-blind, placebo-controlled trials have evaluated L-threonine for spinal spasticity, showing a modest but statistically significant antispastic effect. This is the best-supported clinical application of L-threonine supplementation.

Lavender has well-documented anxiolytic, sedative, analgesic, anticonvulsive, and neuroprotective effects supported by animal models and clinical human studies. A 2013 PMC review (PMC3612440) comprehensively surveyed evidence for lavender across neurological disorders. Oral lavender oil preparation Silexan has demonstrated clinical efficacy for anxiety disorders equivalent to lorazepam and paroxetine.

Lecithin is a phospholipid mixture rich in phosphatidylcholine that provides essential structural components for neuronal membranes and serves as a choline source for acetylcholine synthesis. It has been studied clinically for Alzheimer's disease, tardive dyskinesia, and neurological conditions requiring cholinergic support.

Lemon balm (Melissa officinalis) has been used since the Middle Ages for nervous system conditions including anxiety and insomnia. GABA transaminase inhibition has been identified as a key mechanism, and clinical trials demonstrate significant reductions in anxiety and mood improvements.

Lion's Mane (Hericium erinaceus) mushroom has a long history in Traditional Chinese Medicine for supporting nervous system health. Its bioactive compounds hericenones and erinacines stimulate Nerve Growth Factor (NGF) production, supporting neuronal survival and growth. Preclinical studies show strong neurotrophic effects, with emerging human clinical data.

Lithium exerts well-documented neuroprotective effects in the nervous system, including inhibiting apoptosis, reducing neuroinflammation, blocking amyloid-β and tau pathology, and promoting neurotrophic factor expression. These effects have been demonstrated in cell models, animal studies, and some human clinical data, and are mechanistically applicable to lithium orotate.

Lotus seed alkaloids (neferine, liensinine) exert neuroprotective, anticonvulsant, and neurotransmitter-modulating effects in animal models. TCM has long used lotus seed embryo for nervous system disorders. No human neurological trials exist specifically for lotus seed.

Magnesium is an essential mineral that plays a critical role in nervous system function as a natural NMDA receptor antagonist, modulating synaptic transmission and neuronal excitability. Deficiency is associated with increased risk of neurological symptoms, and supplementation supports normal nerve function.

Manganese is required for glutamine synthetase activity in astrocytes, which regulates glutamate-glutamine cycling and neurotransmitter homeostasis in the brain. MnSOD protects neurons from mitochondrial oxidative stress. Both deficiency and excess manganese disrupt normal nervous system function.

Preclinical studies in zebrafish have demonstrated that marjoram essential oil has neuroprotective effects, improving cognitive performance and reducing acetylcholinesterase activity in a scopolamine-induced amnesia model. Traditional use as a nervine is extensively documented.

Methylcobalamin is the active, neurologically bioavailable form of vitamin B12 that promotes regeneration of injured nerves, antagonizes glutamate-induced neurotoxicity, and improves nerve conduction. Clinical studies document its analgesic effects in diabetic neuropathy, low back pain, and neuralgia.

Molybdenum cofactor deficiency (MoCD) and isolated sulfite oxidase deficiency both produce severe, progressive neurological damage in humans — presenting as neonatal seizures, encephalopathy, brain atrophy, and early death. This represents the strongest and most direct clinical evidence linking molybdenum to nervous system health. Sulfite accumulation is the primary neurotoxic mechanism.

N-Acetyl Cysteine is a precursor to glutathione, the brain's primary antioxidant, and modulates glutamatergic neurotransmission. Multiple clinical trials and meta-analyses support its use for psychiatric and neurological conditions including OCD, depression, bipolar disorder, and neuroprotection.

Omega-3 fatty acids, particularly EPA and DHA, play a significant role in brain function, development, and nervous system health, with neuroprotective effects mediated through reduction of neuroinflammation. Evidence supports benefits in depression, cognitive decline, and multiple neurological conditions.

Passionflower (Passiflora incarnata) has been used in European and American traditional medicine for anxiety, insomnia, and nervous tension. Clinical trials demonstrate comparable efficacy to oxazepam for generalized anxiety disorder, with GABA-A receptor modulation identified as a key mechanism.

Phosphatidylcholine is a major structural phospholipid of neuronal cell membranes and a source of choline for acetylcholine synthesis. It supports neuronal membrane integrity, neurotransmitter production, and myelin synthesis, with evidence for cognitive support in aging and neurological conditions.

Phosphatidylethanolamine (PE) is the second most abundant phospholipid in neuronal membranes, critical for maintaining membrane curvature, synaptic vesicle fusion, and mitochondrial function in neurons. It is essential for proper nervous system structural integrity and function.

Phosphatidylinositol is a critical membrane phospholipid in neurons that serves as the substrate for second messenger systems essential to nervous system signal transduction. IP3-mediated calcium signaling from PI hydrolysis is fundamental to neurotransmitter release and synaptic plasticity.

Phosphatidylserine is an endogenous phospholipid critical to neuronal cell membranes that supports memory, cognitive function, and nervous system integrity. Clinical evidence and an FDA-qualified health claim support its role in mitigating cognitive decline.

Phospholipids—which contain phosphorus as an essential structural element—are the primary components of neuronal cell membranes and are required for synaptic neurotransmission. Phosphate-based high-energy molecules (ATP, phosphocreatine) fuel all nervous system function. Disturbances in brain phosphorus metabolism are detectable in neurological disease.

Radix Polygalae is extensively studied as a neuroprotectant across multiple CNS disorders. Preclinical evidence supports protection against Alzheimer's and Parkinson's disease models, reduction of oxidative stress and neuroinflammation, enhancement of cholinergic function, and promotion of neuronal survival. It is classified as a cerebrotonic in TCM and Japanese Kampo.

Pharmacological reviews confirm that Polygala root has broad protective effects on the central nervous system, including neuroprotection against oxidative stress, neuroinflammation, and excitotoxicity. Modern pharmacological studies identified CNS protection as a primary pharmacological category for this herb.

Potassium is fundamental to nerve cell membrane potential and action potential propagation. K+ channels control repolarization in neurons, and dyskalemias produce clinically documented neuromuscular dysfunction including weakness, paresthesia, and in severe cases paralysis. This relationship is mechanistically established and clinically validated.

Pregnenolone is an endogenous neurosteroid synthesized in the brain and peripheral nervous system from cholesterol, functioning as the precursor to all steroid hormones and acting directly as a positive allosteric modulator at multiple neurotransmitter receptors. It has been studied for cognitive enhancement and neuroprotection.

PQQ disodium salt stimulates NGF production in astroglial cells, protects neurons from glutamate-induced excitotoxicity, and has demonstrated neuroprotective effects in multiple preclinical models. Human trials confirm cognitive and mood benefits at 20 mg/day, consistent with active neuroprotection.

Rhodiola rosea has a long traditional use in stimulating the nervous system and treating stress-induced fatigue and depression. Its active compounds salidroside and rosavins modulate neurotransmitter systems. Clinical trials document efficacy in reducing fatigue, burnout, and stress-induced nervous system symptoms.

RJ and its bioactive lipid fraction (10-HDA) stimulate neurogenesis, promote neurite outgrowth, modulate neurotransmitter synthesis (GABA, serotonin, dopamine), and reduce neuroinflammation across multiple preclinical models. A combination clinical trial showed cognitive benefit in MCI. Human-specific neural protection evidence is limited.

Saffron (Crocus sativus) and its active constituents crocin, crocetin, and safranal have been studied in multiple RCTs for depression and anxiety. Meta-analyses confirm efficacy for mild-to-moderate depression comparable to standard antidepressants, with serotonergic and neuroprotective mechanisms.

SAMe is an endogenous methyl donor essential for synthesis of neurotransmitters including dopamine, serotonin, and norepinephrine, as well as myelin maintenance. Multiple RCTs confirm its efficacy for depression comparable to tricyclic antidepressants, with a favorable safety profile.

Schisandra lignans cross the blood-brain barrier and protect the nervous system via antioxidant, anti-neuroinflammatory, and neuroprotective mechanisms. A PMC review (PMC6073455) summarizes extensive preclinical evidence for protection against neurodegeneration. MSKCC confirms schisandra 'appears to protect the liver and nervous system' based on lab evidence. TCM has used it for nervous system complaints including palpitations and anxiety for centuries.

Skullcap has been used in Western herbalism for centuries as a primary nerve tonic. Modern evidence shows that baicalin and baicalein from S. baicalensis protect neurons against oxidative damage, neuroinflammation, excitotoxicity, and apoptosis in multiple preclinical models. S. lateriflora's GABAergic activity supports direct nervous system modulation.

S. indicus demonstrates neuroleptic, anxiolytic, anticonvulsant, and central nervous system depressant activities in preclinical studies. It is also referenced for neuroprotective effects against age-related neurological changes in animal models. Traditional use covers epilepsy and mental illness.

St. John's Wort (Hypericum perforatum) is one of the most extensively studied herbal medicines for nervous system conditions, particularly mild-to-moderate depression. Multiple meta-analyses confirm superiority to placebo and comparable efficacy to standard antidepressants for mild depression.

Taurine is one of the most abundant amino acids in the brain and spinal cord and is essential for neuronal development, proliferation, and survival. It acts as an inhibitory neuromodulator via glycine and GABA receptors and protects neurons from excitotoxicity, oxidative stress, and mitochondrial dysfunction.

Curcumin exhibits documented neuroprotective properties including anti-neuroinflammatory, antioxidant, and BDNF-upregulating effects relevant to nervous system health. Clinical evidence supports its benefit in cognitive function, depression, and neuropsychiatric conditions. Multiple pathways relevant to neural protection have been validated in human studies.

Velvet bean (Mucuna pruriens) is a rich botanical source of L-DOPA, the direct dopamine precursor, used in Ayurvedic medicine for centuries for nervous system conditions. Clinical trials confirm efficacy for Parkinson's disease motor symptoms through direct dopaminergic nervous system support.

Vincamine is a natural alkaloid from Vinca minor that is a precursor to vinpocetine, with vasodilatory effects on cerebral blood vessels. It has been used traditionally and clinically in European medicine for cerebrovascular insufficiency and age-related cognitive decline.

Vinpocetine is a semi-synthetic derivative of the periwinkle alkaloid vincamine that dilates cerebral blood vessels, improves cerebral blood flow, exhibits potent anti-inflammatory effects at the microglial level, and has been used clinically for cognitive impairment and nervous system disorders.

Vitamin B1 (thiamine) is an essential neurotropic vitamin required as a cofactor in glucose metabolism that indirectly supports synthesis of neurotransmitters, myelin, and nucleic acids in the nervous system. Deficiency causes severe neurological disorders including Wernicke's encephalopathy and peripheral neuropathy.

Vitamin B12 is essential for nervous system health, critical for myelin synthesis and neuronal maintenance. Deficiency causes subacute combined degeneration of the spinal cord, peripheral neuropathy, and cognitive changes. Supplementation is well-established to reverse neurological symptoms of B12 deficiency.

Vitamin B3 is essential for NAD+ synthesis, which is critical for neuronal energy metabolism, DNA repair, and survival of neurons. Severe deficiency causes pellagra with neurological manifestations including confusion and dementia. Recent reviews identify niacin as a promising therapeutic target in multiple sclerosis, Parkinson's disease, Alzheimer's disease, and ALS, operating through NAD+ replenishment and Hcar2 receptor-mediated neuroprotection.

Vitamin B5 is essential for the synthesis of acetylcholine, the primary neurotransmitter enabling nervous system communication. Experimental B5 deficiency in humans produces neurological symptoms including paresthesia, muscle weakness, and impaired coordination. Post-mortem studies show markedly depleted cerebral pantothenate in Alzheimer's, Huntington's, and Parkinson's disease dementia.

Vitamin B6 (pyridoxine) is a neurotropic vitamin essential as a coenzyme in the biosynthesis of multiple neurotransmitters including serotonin, dopamine, GABA, and norepinephrine. Deficiency causes peripheral neuropathy, and supplementation supports nervous system function.

Folate (vitamin B9) is essential for nervous system development and maintenance, critical for one-carbon methylation supporting neurotransmitter synthesis and homocysteine metabolism. Deficiency causes neural tube defects and is linked to peripheral neuropathy, depression, and dementia.

Methylfolate (5-MTHF) is the active, blood-brain barrier-crossing form of folate that directly supports neurotransmitter synthesis, methylation reactions, and homocysteine metabolism in the nervous system. It is particularly important for individuals with MTHFR polymorphisms who cannot efficiently convert folic acid.

Wheat germ is a significant source of folate, B vitamins (B1, B6), vitamin E, and magnesium—all well-established as critical for nervous system structure and function. Folate deficiency is linked to neural tube defects and demyelinating diseases. B1 (thiamine) deficiency causes severe neuropathy. Wheat germ provides these nutrients in a nutritionally dense form.

Withanolides are the primary neuroprotective steroidal lactones from Ashwagandha (Withania somnifera). Preclinical and clinical studies document their effects on Alzheimer's disease pathology, neural regeneration, GABA-A receptor modulation, and anti-neuroinflammation.

Yeast (particularly fortified nutritional yeast) is one of the richest sources of B-complex vitamins critical to neurological function, including thiamine (B1), riboflavin (B2), niacin (B3), pyridoxine (B6), and folate (B9). These vitamins are essential for neurotransmitter synthesis, myelin maintenance, and nerve conduction. Deficiencies in these vitamins are directly causative of neurological disease.

Cordyceps (Cordyceps sinensis/militaris) has been used in Traditional Chinese Medicine for centuries to tonify the nervous system, combat fatigue, and enhance mental clarity. Modern research identifies adenosine, cordycepin, and polysaccharides as active compounds with documented neurological effects.

Eleuthero (Eleutherococcus senticosus, Siberian ginseng) has been used in traditional Russian and Chinese medicine to stimulate the nervous system, combat fatigue, and enhance stress resistance. Modern research shows adaptogenic effects on the HPA axis and nervous system resilience.

Muira puama has a centuries-long traditional role as a nervous system tonic ('nerve tonic') in Amazonian Brazil, European herbalism, and the British and German herbal pharmacopeias. It has been used for neurasthenia, paralysis, ataxia, neuralgia, and general nervous weakness. Laboratory evidence of neuroprotective and adaptogenic properties provides biological plausibility.

Reishi mushroom (Ganoderma lucidum) has been used in Traditional Chinese Medicine for over 2000 years for nervous system calming, anxiety reduction, and cognitive support. Modern research identifies triterpenes and polysaccharides with neuroprotective and GABAergic activity.

Rosemary (Rosmarinus officinalis) has been used in European traditional medicine since antiquity for nervous system stimulation, cognitive enhancement, and headache relief. Modern research identifies rosmarinic acid and carnosic acid as active compounds with neuroprotective and acetylcholinesterase-inhibiting properties.

Schisandrins are the primary bioactive lignans from Schisandra chinensis, used in Traditional Chinese Medicine for over 2000 years as an adaptogen to strengthen the nervous system and improve mental performance. Modern research confirms anti-stress and neuroprotective properties.

Valerian root has been used in European traditional medicine since antiquity for nervous system complaints including anxiety, insomnia, and nervous tension. Its valerenic acid components modulate GABA-A receptors, providing the scientific basis for its traditional anxiolytic and sedative properties.