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5-HTP is the direct precursor to serotonin and melatonin, both of which regulate sleep, mood, and energy. Low serotonin is implicated in chronic fatigue syndrome, and 5-HTP has been studied in CFS patients. Studies show 5-HTP may improve sleep quality and reduce fatigue in individuals with serotonin-deficiency-related fatigue.

Acetyl-L-Carnitine (ALCAR) facilitates mitochondrial fatty acid oxidation for ATP production and crosses the blood-brain barrier to support both physical and mental energy. Clinical studies in patients with chronic fatigue-related conditions (hepatic encephalopathy, CFS) show significant reductions in both mental and physical fatigue. It is more potent than standard L-carnitine for energy-related applications.

Alpha-Lipoic Acid is a mitochondrial coenzyme essential for pyruvate dehydrogenase and alpha-ketoglutarate dehydrogenase complexes in the Krebs cycle. It functions as a powerful antioxidant and has been studied for fatigue in ME/CFS patients, particularly in combination with other mitochondrial-targeted nutrients. Clinical evidence supports its role in reducing oxidative stress-related fatigue.

Two clinical studies — a 2006 pilot (n=41) and a 2012 multicenter trial (n=257) — found D-ribose at 15 g/day produced marked improvements in energy, pain, sleep, and overall well-being in CFS/fibromyalgia patients. Both studies were open-label and uncontrolled, but the findings were consistent across populations. CFS is theorized to involve impaired mitochondrial ATP metabolism, providing a mechanistic rationale.

Human RCTs of the standardised A. galanga extract (EnXtra®) demonstrate significant reduction in fatigue and daytime sleepiness alongside increased energy over four weeks of supplementation. This places A. galanga among a small group of herbs with actual RCT data for fatigue outcomes.

Multiple randomized, double-blind, placebo-controlled trials demonstrate that ashwagandha root extract significantly reduces fatigue and improves energy levels in stressed and fatigued adults. A key mechanism involves HPA-axis modulation, cortisol reduction, and mitochondrial support. NIH ODS acknowledges clinical evidence for improved energy and well-being with standardized extracts.

Astaxanthin is a powerful carotenoid antioxidant produced by Haematococcus pluvialis microalgae, clinically studied for reducing exercise-induced fatigue and oxidative stress. Multiple RCTs and animal studies demonstrate reduced physical fatigue, improved endurance, and reduced inflammatory markers. It protects mitochondrial membranes from oxidative damage central to fatigue pathophysiology.

Astragalus (Astragalus membranaceus) has been used in Traditional Chinese Medicine for over 2,000 years as a 'Qi tonic' for fatigue and weakness. Clinical evidence supports its use in cancer-related fatigue and immune-related energy deficits. Astragaloside IV, its primary active constituent, supports mitochondrial function and HPA axis modulation.

Adenosine 5-triphosphate disodium (PEAK ATP) is the supplement form of ATP studied in clinical trials for muscular endurance and fatigue. RCTs demonstrate improvements in muscle excitability, strength, and fatigue at 400 mg/day. It acts via purinergic receptors to improve blood flow and muscle energy availability.

BA supplementation delays the onset of neuromuscular fatigue by elevating muscle carnosine and buffering exercise-induced acidosis, allowing sustained effort before subjective and biochemical fatigue thresholds are reached. RCTs have demonstrated significant increases in the physical working capacity at fatigue threshold (PWCFT) and time-to-exhaustion in both younger and older populations. Effects are exercise-context specific rather than addressing systemic chronic fatigue syndrome.

A 2025 systematic review and meta-analysis of 16 RCTs found that beta-glucan supplementation significantly reduced fatigue, increased vigor, and improved mood state in healthy individuals compared to placebo. The mechanism is thought to involve immune modulation and reduction of subclinical inflammation that contributes to fatigue. Effect sizes were modest but statistically robust.

CoQ10 and NADH both increase cellular ATP production through mitochondrial oxidative phosphorylation, and CoQ10 supplementation has been investigated in fatigue syndromes including ME/CFS. Reduced CoQ10 levels have been documented in chronic fatigue patients. Bovine heart is the richest food source of CoQ10 alongside contributing L-carnitine and B12.

Bovine liver provides B12, heme iron, riboflavin, niacin, pantothenic acid, and CoQ10 — nutrients that are collectively essential for mitochondrial ATP production and red blood cell oxygen transport. Deficiencies in B12 and iron are clinically recognized causes of chronic fatigue. The dense B-vitamin profile of liver directly feeds into energy metabolism pathways.

Cistanche tubulosa (Orobanchaceae, also known as broomrape) has human clinical trial evidence for reducing fatigue symptoms. A randomized, double-blind, placebo-controlled trial in 190 adults with chronic fatigue syndrome (CFS) showed significant improvement in fatigue scores and blood lactic acid levels with a Cistanche+ginkgo combination. Orobanche cumana in ancient Chinese use was also attributed antifatigue effects.

Caffeine is among the best-evidenced substances for acutely reducing fatigue and improving alertness, recognized across extensive clinical research. It acts as an adenosine receptor antagonist, blocking fatigue signals in the central nervous system. Multiple systematic reviews confirm its efficacy for reducing perceived fatigue and increasing vigilance and alertness.

Chlorella is a single-celled green alga rich in protein, chlorophyll, iron, B vitamins, and antioxidants. Clinical evidence includes an RCT showing Chlorella supplementation reduced fatigue in patients with fibromyalgia. Its dense nutrient profile addresses multiple nutritional deficiency-related causes of fatigue, and animal studies document reduced exercise fatigue markers.

Multiple RCTs demonstrate that CoQ10 supplementation (alone or with NADH) significantly reduces fatigue in chronic fatigue syndrome (ME/CFS) patients. A 2021 RCT of 242 ME/CFS patients showed improved fatigue perception, sleep quality, and health-related quality of life over 12 weeks. CoQ10 deficiency is well-documented in CFS and is mechanistically linked to impaired mitochondrial ATP production.

Cordyceps sinensis has been used in Traditional Chinese Medicine for centuries for fatigue, invigoration, and endurance. Clinical trials including a randomized, double-blind, placebo-controlled trial in elderly subjects show improved aerobic capacity and reduced fatigue. A 2024 RCT in long COVID patients found Cs4 supplementation significantly improved fatigue scores.

Creatine is a well-established ergogenic supplement that maintains ATP availability in muscle and brain, directly countering energy depletion and fatigue during high-intensity activity. Multiple systematic reviews and meta-analyses confirm its efficacy for reducing fatigue and improving performance. It also shows promise for mental fatigue, sleep deprivation, and certain neuromuscular conditions associated with fatigue.

Creatine monohydrate is the most studied and evidence-supported form of creatine for reducing fatigue and maintaining ATP availability in muscle and brain. Hundreds of RCTs and multiple systematic reviews confirm its efficacy. It is specifically studied under this name in the vast majority of fatigue and performance research.

D-Ribose is the structural backbone of ATP and has been studied specifically for chronic fatigue syndrome and fibromyalgia, where impaired ATP synthesis is a documented pathophysiology. A multicenter clinical trial (ClinicalTrials.gov NCT03186027) investigated D-ribose supplementation in CFS/FMS patients and found significant improvements in energy and quality of life.

Low DHEAS levels correlate with fatigue in adrenal insufficiency and aging. DHEA replacement in Addison's disease improved mood in some studies; in SLE, DHEA has been studied as a pharmacological agent for managing fatigue. However, in healthy elderly individuals and in Addison's disease RCTs, DHEA supplementation did not significantly reduce fatigue on validated scales.

Eleuthero (Eleutherococcus senticosus, 'Siberian ginseng') has a documented RCT showing possible effectiveness for fatigue in patients with moderate chronic fatigue syndrome. It has been used in Russian and Chinese traditional medicine as an adaptogen for physical and mental fatigue. A systematic review (Yang et al. 2022) noted this RCT as evidence supporting its use in moderate fatigue.

Anti-fatigue activity is among the documented pharmacological properties of eucommia across multiple published reviews and preclinical studies. The bark is noted in the Shennong Herbal Classic for 'relieving exhaustion,' and modern pharmacological research has confirmed anti-fatigue effects including enhanced energy metabolism and mitochondrial function.

Animal studies with chronic fatigue syndrome models show shilajit (containing fulvic acid) prevents mitochondrial oxidative stress and maintains energy-related behaviors. Fulvic acid's mitochondrial support role provides a mechanistic basis, with traditional Ayurvedic use as an energy-restoring adaptogen.

A double-blind RCT of Ganopoly in 132 neurasthenia patients showed significant reduction in fatigue and improvement in well-being over 8 weeks. A pilot RCT in breast cancer patients also demonstrated significant fatigue reduction with Ganoderma spore powder.

Ginkgo biloba extract has well-documented effects on cerebral blood flow and mitochondrial function that may contribute to reduced mental fatigue. It is among the most extensively studied herbal supplements with numerous clinical trials showing improvements in cognitive performance, mental energy, and fatigue in both healthy adults and those with cognitive decline.

Panax ginseng has been used in East Asian medicine for thousands of years as a tonic for vitality and fatigue. A 2020 systematic review and meta-analysis of 8 RCTs found Panax ginseng compounds were superior to placebo on fatigue scales and heart rate recovery (p<0.05). A separate 2022 meta-analysis of disease-related fatigue RCTs also demonstrated anti-fatigue benefits.

Ginsenosides are the primary active constituents of Panax ginseng responsible for its anti-fatigue effects, confirmed in a 2020 systematic review and meta-analysis of 8 RCTs showing superiority to placebo on fatigue scales and heart rate recovery (p<0.05). They modulate HPA axis activity, reduce oxidative stress markers, and improve mitochondrial energy metabolism.

Goji berry (Lycium barbarum) is a classical TCM tonic herb used for millennia to combat fatigue and strengthen vitality. A randomized clinical trial in healthy adults found Goji berry juice improved energy levels, fatigue ratings, and quality of life versus placebo. Its polysaccharides (LBP) modulate mitochondrial function and antioxidant defenses.

Multiple clinical trials support guarana's ability to reduce fatigue, including cancer-related fatigue. A pivotal double-blind RCT in breast cancer chemotherapy patients (n=75) found guarana extract significantly improved fatigue scores (FACIT-F, BFI) versus placebo at days 21 and 49. A systematic review and meta-analysis of 7 studies (427 cancer patients) supports guarana for cancer-related fatigue management. Traditional use by Amazonian peoples for fatigue predates these findings.

Iodine deficiency is a direct cause of hypothyroidism, and fatigue is the cardinal symptom of hypothyroidism. Patients with low thyroid hormone levels, driven by iodine insufficiency, experience chronic, persistent tiredness unrelieved by rest. Population surveys confirm fatigue and weakness as the most common reported symptoms of iodine-deficiency-related low thyroid function. Correcting deficiency and restoring thyroid hormones reliably improves fatigue.

Iron deficiency is the most common nutritional deficiency worldwide and a primary, well-established cause of fatigue and low energy. Even without frank anemia, iron deficiency (low ferritin) causes fatigue. Iron repletion in deficient individuals consistently and significantly reduces fatigue. The 2020 Tardy et al. review and NIH ODS confirm iron's central role in oxygen transport and energy metabolism.

Jiaogulan (Gynostemma pentaphyllum) is used in Chinese traditional medicine as an adaptogen for fatigue, stamina, and longevity. Its gypenosides activate AMPK, supporting mitochondrial energy metabolism. Clinical studies show improved exercise performance and reduced fatigue, and it is called the 'herb of immortality' in southern Chinese folk medicine.

L-carnitine plays an essential role in mitochondrial energy metabolism by shuttling long-chain fatty acids for ATP production. It is consistently identified by peer-reviewed reviews alongside B vitamins, magnesium, and iron as a nutrient relevant to fatigue and energy metabolism. Clinical studies support its use in fatigue associated with deficiency states and certain chronic conditions.

Multiple human RCTs show L-ornithine reduces subjective fatigue in both physical and psychosocial stress contexts. Sugino et al. found significant anti-fatigue effects on a VAS scale and physical performance during prolonged cycling. The 2014 Miyake et al. 8-week RCT reported sustained improvements in fatigue-related POMS subscales in workers with low-grade fatigue taking 400 mg/day. The proposed mechanism involves urea cycle-mediated ammonia clearance and upregulation of lipid metabolism via growth hormone.

L-Theanine, an amino acid from green tea, promotes relaxed alertness by modulating alpha-brain waves and GABA/glutamate neurotransmission. It counteracts the jitteriness of caffeine while maintaining anti-fatigue and alertness effects. Multiple RCTs document its effects on fatigue, stress, and cognitive performance, particularly in combination with caffeine for sustained energy.

L-Tyrosine is the dietary precursor of catecholamine neurotransmitters (dopamine, norepinephrine, epinephrine), which regulate arousal, motivation, and stress resilience. NIH-published research (NBK209061) documents tyrosine's ability to prevent stress-induced fatigue by maintaining catecholamine levels during demanding conditions. It is particularly effective for fatigue under acute physical or cognitive stress.

Licorice root's inhibition of 11β-HSD2 prolongs cortisol activity, and this mechanism has been proposed as a treatment rationale for chronic fatigue syndrome (CFS), where low adrenal cortisol levels are implicated. EBSCO Research Starters and authoritative herbal references cite CFS as a studied indication. Evidence is mechanistic and case/observational level rather than from large RCTs.

Lion's Mane (Hericium erinaceus) is clinically studied for cognitive fatigue, neurological function, and mental energy. A double-blind RCT in Japanese adults found Lion's Mane powder significantly improved cognitive function and reduced fatigue-associated anxiety compared to placebo. Its hericenones and erinacines stimulate nerve growth factor (NGF), supporting neurological energy and function.

Maca (Lepidium meyenii) has been used in Andean traditional medicine for energy, endurance, and fatigue since pre-Columbian times. Clinical and preclinical studies show anti-fatigue effects via mitochondria protection and oxidative stress reduction. Multiple studies report improvements in energy scores and mental performance.

Magnesium is a cofactor in over 300 enzymatic reactions including ATP synthesis, glucose metabolism, and protein production. Deficiency is associated with fatigue and muscle weakness. EFSA authorizes a health claim for magnesium contributing to reduction of tiredness and fatigue. The 2020 Tardy et al. review documents magnesium's central role in energy-yielding metabolism and fatigue.

B12 deficiency, corrected by MeCbl, is a well-established cause of fatigue, weakness, and low energy. MeCbl repletion in deficient individuals restores energy and reduces fatigue. Some clinical evidence also suggests B12 may have effects on fatigue beyond nutritional deficiency correction, possibly via circadian or neurological mechanisms.

NADH (reduced nicotinamide adenine dinucleotide) has been studied in RCTs for ME/CFS, particularly in combination with CoQ10. A double-blind RCT (n=73) showed CoQ10 plus NADH significantly reduced fatigue impact scale scores vs. placebo. NADH deficiency is documented in CFS physiopathology.

NR was directly tested in a large RCT for chronic fatigue in the context of long-COVID, where it raised NAD+ levels within 5 weeks but did not significantly improve fatigue versus placebo at the primary endpoint. Exploratory analyses suggested within-group benefits after 10 weeks. Additionally, NR's core mechanism—replenishing NAD+ for mitochondrial oxidative phosphorylation—provides a plausible basis for energy support in states of NAD+ depletion.

NMN is a direct precursor to NAD+, which is central to mitochondrial ATP production and energy metabolism. A 12-week double-blind RCT in older Japanese adults (PMC8877443) studied NMN's effects on sleep quality, fatigue, and physical performance. Multiple clinical trials show NMN increases NAD+ levels and improves energy-related outcomes.

Okra seeds have demonstrated anti-fatigue activity in vivo, identified as the primary anti-fatigue fraction of okra pods. A PMC-indexed study (PMC4632455) showed okra seed constituents—polyphenols, flavonoids, isoquercitrin, and quercetin-3-O-gentiobiose—reduced fatigue biomarkers including blood lactate and blood urea nitrogen in exercise models.

Clinical studies show Pycnogenol improves fatigue and energy in multiple populations including peri-menopausal women and elderly adults in aging studies. Mechanisms include improved microcirculation, antioxidant protection of mitochondria, and reduced systemic inflammation. Burnout and fatigue reduction has been documented in professional populations.

Pregnenolone is the direct precursor to cortisol and DHEA, both essential for energy metabolism and stress response; its deficiency contributes to fatigue. Older clinical studies and modern practitioner-level evidence link pregnenolone supplementation to reduced fatigue. Human trials in pain and mood disorder populations consistently report improved energy as a secondary outcome.

Bee propolis has been used in traditional medicine across cultures for energy and vitality, with modern research showing anti-inflammatory and antioxidant properties that address fatigue pathophysiology. Brazilian green propolis (artepillin C) has been studied for immune support and fatigue reduction, particularly in cancer-related fatigue contexts.

An open-label clinical trial (n=17, 20 mg/day for 8 weeks) showed PQQ disodium salt significantly improved fatigue scores on the POMS-SF. The vigor subscale also increased significantly, suggesting subjective energy enhancement. Quality-of-life measures improved in parallel.

Quercetin is a flavonoid with documented effects on mitochondrial biogenesis and anti-fatigue activity. Multiple clinical trials show quercetin supplementation reduces exercise-induced fatigue and improves endurance performance. It activates SIRT1 and PGC-1α to stimulate mitochondrial biogenesis—a key anti-fatigue mechanism.

Reishi (Ganoderma lucidum, Lingzhi) has been used in Chinese medicine for over 2,000 years as the 'Mushroom of Immortality' for energy, longevity, and fatigue. A double-blind RCT in breast cancer survivors found reishi polysaccharides significantly reduced cancer-related fatigue. Its polysaccharides modulate immune function and mitochondrial energy metabolism.

Resveratrol is a polyphenol from grapes and other plants with documented effects on mitochondrial biogenesis via SIRT1/PGC-1α activation. Clinical evidence shows resveratrol improves metabolic function and reduces fatigue in certain clinical populations. Animal studies consistently show improved endurance and reduced fatigue markers.

Rhodiola rosea has been studied in multiple RCTs for physical and mental fatigue, with a systematic review (PMC 2012) identifying 11 eligible trials. An open-label clinical trial (Karger, 2017) showed significant fatigue improvements in 100 subjects with prolonged or chronic fatigue using 400 mg/day for 8 weeks. Evidence is mixed but positive signals exist for mental fatigue reduction.

Royal jelly is the secretion produced by worker bees for nourishing the queen, rich in 10-Hydroxy-2-Decenoic Acid (10-HDA), proteins, and B vitamins. A Japanese RCT found royal jelly supplementation significantly improved quality of life and reduced fatigue in healthy adults. Clinical and traditional evidence support its energy and vitality-enhancing properties.

A 2009 PubMed-indexed review documented good scientific evidence that schisandra increased endurance and mental performance in patients with mild fatigue and weakness. Small human trials show schisandra may reduce fatigue and improve resilience to stress. In TCM it has been used for centuries as a qi tonic to combat chronic exhaustion and build stamina.

Schisandrins are the primary active lignans of Schisandra chinensis (Wuweizi), a classical Chinese adaptogen. They increase activity of enzymes in oxidative phosphorylation, reducing fatigue and increasing exercise resistance. Schisandra has traditional use in TCM and Russian ethnomedicine as an anti-fatigue adaptogen.

Shilajit is a mineral-rich resinous substance from Himalayan rocks, used in Ayurvedic medicine for millennia as a 'Rasayana' for energy, vitality, and anti-fatigue. Clinical studies show shilajit improves mitochondrial function and CoQ10 efficacy. An RCT demonstrated reduced physical fatigue in healthy volunteers. Its fulvic acid and dibenzo-alpha pyrones support mitochondrial ATP production.

Spirulina (Arthrospira platensis/maxima) is a nutrient-dense cyanobacterium rich in protein, B vitamins, iron, and phycocyanins. Clinical studies demonstrate Spirulina reduces exercise-induced fatigue, improves aerobic capacity, and increases time to exhaustion. An RCT showed improved muscle strength and reduced fatigue in older adults.

In menopausal RCTs, fatigue was among the symptom domains significantly improved by succinate-based supplementation. As a direct mitochondrial substrate entering oxidative phosphorylation via Complex II, succinic acid provides a mechanistic basis for combating cellular energy deficits. Animal studies confirm succinate rescues ATP levels under metabolic stress conditions.

Taurine is a conditionally essential sulfur-containing amino acid widely studied for its role in reducing oxidative stress, improving muscle contractility, and modulating fatigue. A 2025 systematic review and network meta-analysis confirmed taurine's neuromodulatory and cellular homeostasis effects relevant to fatigue, with evidence as a widely used anti-fatigue agent in energy drinks and standalone supplements.

Multiple human RCTs demonstrate Tongkat Ali reduces fatigue scores in aging and stressed populations. A multicentre RCT (Chinnappan et al., 2021) showed improvement in Fatigue Severity Scale (FSS) scores in aging males alongside testosterone normalization. The Talbott et al. (2013) trial showed fatigue subscale improvements in moderately stressed adults. Traditional Southeast Asian use specifically positions the root extract as a treatment for lethargy and fatigue.

CoQ10 supplementation has been specifically studied in myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) with positive results. A 12-week double-blind RCT in 207 ME/CFS patients found that 200 mg CoQ10 plus 20 mg NADH significantly reduced cognitive fatigue and improved health-related quality of life. CoQ10 deficiency and mitochondrial dysfunction are documented features of ME/CFS.

Vitamin B1 (thiamine) is essential for energy-yielding metabolism and has a recognized EU health claim for reducing fatigue and contributing to normal energy-yielding metabolism. It is a required cofactor for pyruvate dehydrogenase and alpha-ketoglutarate dehydrogenase, enzymes central to glucose and ATP production. Deficiency causes profound fatigue and weakness.

Vitamin B12 deficiency is among the most common and well-documented causes of chronic fatigue, neurological symptoms, and megaloblastic anemia. B12 repletion in deficient individuals reliably and significantly improves fatigue and energy. It is essential for myelin synthesis, red blood cell formation, and DNA synthesis—all contributing to oxygen delivery and cellular energy.

Vitamin B2 (riboflavin) is essential for the synthesis of FMN and FAD, coenzymes that are integral to the mitochondrial electron transport chain and energy-yielding metabolism. EFSA has authorized a health claim for riboflavin contributing to energy-yielding metabolism and reduction of tiredness and fatigue. Deficiency is linked to fatigue and reduced physical performance.

Niacin (Vitamin B3) is a precursor to NAD+ and NADH, which are central to mitochondrial electron transport and ATP production. EFSA authorizes a health claim for niacin contributing to normal energy-yielding metabolism and reduction of tiredness and fatigue. Deficiency (pellagra) causes severe fatigue and weakness.

Niacinamide (nicotinamide) is a form of Vitamin B3 and a direct precursor to NAD+, central to mitochondrial energy production and electron transport. Like niacin, it carries an EFSA health claim for contribution to energy-yielding metabolism and reduction of fatigue. It is better tolerated than niacin and studied in ME/CFS-related energy metabolism.

Vitamin B5 (pantothenic acid) is essential for Coenzyme A synthesis, which is required for the Krebs cycle, fatty acid metabolism, and acetyl-CoA production. EFSA authorizes a health claim for pantothenic acid contributing to normal energy-yielding metabolism and reduction of tiredness and fatigue. Deficiency causes pronounced fatigue and the 'burning feet' syndrome.

Vitamin B6 (pyridoxine) is a cofactor in over 100 enzymatic reactions including amino acid metabolism, glycogen breakdown, and neurotransmitter synthesis. EFSA authorizes a health claim for B6 contributing to energy-yielding metabolism and reduction of tiredness and fatigue. It is also required for L-carnitine biosynthesis, which directly supports mitochondrial energy production.

Folate (Vitamin B9) is essential for DNA synthesis and red blood cell maturation. Deficiency causes megaloblastic anemia and fatigue. EFSA authorizes a health claim for folate contributing to normal blood formation and reduction of tiredness and fatigue. It is included in the authoritative 2020 Tardy et al. review (PMC7019700) among micronutrients with recognized roles in fatigue.

Methylfolate (5-MTHF) is the bioactive form of folate and bypasses MTHFR enzyme conversion, making it particularly relevant for individuals with MTHFR polymorphisms who often present with fatigue. It directly participates in methylation reactions and neurotransmitter synthesis. Clinical evidence supports superiority over folic acid in specific populations experiencing fatigue.

Vitamin C is essential for L-carnitine biosynthesis and iron absorption—two processes directly linked to energy production and fatigue. EFSA authorizes a health claim for vitamin C contributing to the reduction of tiredness and fatigue. Deficiency (scurvy) presents prominently with severe fatigue, and subclinical deficiency impairs carnitine synthesis and iron utilization.

Vitamin D deficiency is strongly and consistently associated with fatigue, muscle weakness, and low energy across multiple observational studies and clinical trials. Supplementation in deficient individuals significantly improves fatigue. It is among the most common nutrient deficiencies linked to fatigue and is recognized by NIH and Harvard Health as a key micronutrient in this context.

An open-label clinical trial of ME/CFS patients found that 9.6 mg/day of 6-MSITC for 12 weeks significantly improved performance status and reduced subjective symptoms including pain and cognitive dysfunction. A separate single-arm trial in healthy adults with daily fatigue reported improvements in pre-task fatigue, sleep, and mood. Both studies lacked placebo controls, limiting causal inference.

Zinc is a cofactor for over 200 metalloenzymes involved in energy metabolism, DNA synthesis, and immune function. EFSA authorizes a health claim for zinc contributing to normal energy-yielding metabolism. The 2020 Tardy et al. review includes zinc among micronutrients with recognized roles in fatigue when status is inadequate.

Adrenal cortex extract has historically been used by integrative practitioners for chronic fatigue, framed around HPA axis dysregulation and suboptimal cortisol output. A randomized placebo-controlled study of low-dose hydrocortisone and fludrocortisone for chronic fatigue syndrome showed no beneficial effect. OTC adrenal cortex supplements have no clinical trial evidence for ME/CFS or chronic fatigue.

Tonifying Qi and relieving fatigue is a primary TCM indication of Atractylodes macrocephala, and it is considered a tonic herb in Chinese medicine. Preclinical data suggest its polysaccharides may support energy metabolism via AMPK/PGC1α. Human-specific clinical trial data on fatigue are limited.

Bacopa monnieri (Brahmi) is a classical Ayurvedic herb traditionally used for mental fatigue, cognitive function, and adaptogenic support. While primary clinical trial focus is on memory and cognitive performance, traditional use specifically includes mental exhaustion and fatigue. Some clinical evidence supports reduced anxiety and improved cognitive performance that may benefit mental fatigue.

Epimedium is classified in TCM as a tonic herb used for physical and mental fatigue, and is listed as an aphrodisiac and energy-enhancing agent. Its traditional use for fatigue is documented in ethnopharmacological literature. Icariin's effects on mitochondrial function, antioxidant defense, and testosterone support provide mechanistic plausibility.

Black spruce is widely used in aromatherapy for chronic fatigue and low energy, attributed to its cortisol-supporting, adrenal-toning, and stimulating properties. Peter Holmes (Aromatica) and Kurt Schnaubelt (Advanced Aromatherapy) both document it for fatigue and burnout. Conifer phytoncide research documents effects on chronic fatigue.

Iron and B12 deficiencies are recognized contributors to chronic fatigue, and bovine spleen is exceptionally rich in both nutrients as well as heme iron. Traditional practice directed spleen consumption toward debility and low energy states. No clinical trial data confirm bovine spleen supplementation for chronic fatigue as a defined condition.

Cat's claw is used in traditional South American medicine and modern herbal practice for fatigue associated with chronic inflammatory conditions. The NIH/NCBI LiverTox monograph lists it as used for 'fatigue' alongside fever and muscle aches. Modern herbalists recommend it for 'chronic fatigue' and related syndromes, though no clinical trials targeting fatigue specifically exist.

Codonopsis pilosula (Dangshen) is a classical TCM herb used as an affordable substitute for Panax ginseng, specifically indicated for Qi deficiency manifesting as fatigue, weakness, and low energy. It has been used in TCM for centuries as an energy tonic and is documented in Chinese Pharmacopoeia with anti-fatigue indications.

Damiana has been used as a tonic and stimulant to combat debility and fatigue across Mexican and Central American traditional medicine, and was included in the US National Formulary as an invigorant from 1888. Its caffeine content and stimulant volatile oils provide partial mechanistic support. No clinical fatigue studies exist.

Dong Quai (Angelica sinensis) is a classical TCM herb used for centuries as a blood tonic for fatigue, weakness, and anemia—particularly in women. Its use for fatigue is directly tied to blood deficiency (anemia-related fatigue) in TCM. The WHO traditional medicine monograph acknowledges its use for fatigue and blood deficiency.

Fu Ling is classified in TCM as a Qi tonic and has been used for centuries for fatigue, weakness, and recovery from debilitating illness. It is listed among historical uses for 'recovery from long illness' and physical weariness. The Chinese Pharmacopoeia Shennong Bencao Jing classifies it as a superior herb for promoting vitality.

Treating fatigue and weakness is among the oldest documented traditional uses of G. littoralis across Chinese, Japanese, and Korean medicine. The PMC 2019 systematic review explicitly lists fatigue and weakness as classical TCM indications. No clinical or pharmacological studies on fatigue were identified.

Injectable bovine liver extract containing folic acid and cyanocobalamin (LEFAC) was historically used in Southern California as a treatment for chronic fatigue syndrome. A 1989 double-blind RCT (Kaslow et al., Arch Intern Med) found no significant benefit over placebo in 15 CFS patients, though a strong placebo response was noted. The use therefore rests on traditional/historical practice rather than confirmed clinical efficacy.

Maitake (Grifola frondosa) has been used in Japanese and Chinese traditional medicine for energy, vitality, and fatigue. Its beta-glucan polysaccharides (D-fraction) modulate immune function and have demonstrated adaptogenic properties in animal studies. While direct clinical fatigue RCTs are limited, traditional use as a tonic and preliminary scientific data support its inclusion.

Muira puama is one of the most historically prominent traditional remedies for chronic debility, fatigue, and low energy in Amazonian folk medicine. It is described across multiple authoritative sources as an 'energy tonic' and 'general health improver,' and its traditional use for debility is documented in the UTEP Herbal Safety database and multiple pharmacopeias.

Traditional use of prickly pear for fatigue is documented in Mexican, Latin American, and Asian folk medicine. The Pollinator.org fact sheet lists fatigue among historically recognized indications. No clinical trials specifically examining fatigue outcomes with Opuntia have been published.

Strengthening human energy and combating age-related fatigue are documented traditional TCM applications of Ligustrum lucidum. It is used as a yin-nourishing tonic for chronic depletion states. No clinical trial data targeting fatigue endpoints exist.

Prepared Rehmannia (Shu Di Huang) is a core TCM tonic for chronic fatigue associated with kidney or blood deficiency, described as addressing weakness, lassitude, and low back pain from constitutional depletion. The Restorative Medicine monograph lists fatigue as a recognised traditional indication. Naturopathic practitioners cite Rehmannia for chronic fatigue associated with adrenal insufficiency.

Rehmannia is used in TCM as an adrenal and kidney tonic for fatigue, exhaustion from overwork, and chronic low energy states associated with Kidney Yin and Yang deficiency. The Restorative Medicine monograph lists fatigue among its indications. Preclinical anti-fatigue properties have been reported.

Poria cocos sclerotium has been used in TCM as a qi-tonifying herb to combat fatigue and promote vitality. Pharmacological reviews list anti-fatigue activity among its documented effects, and TCM includes it in formulas targeting fatigue and nervous exhaustion.

Black spruce essential oil is well-established in French aromatherapy as an adaptogenic restorative for chronic fatigue, burnout, and adrenal exhaustion. It is described by prominent aromatherapists (Dr. Kurt Schnaubelt) as supportive of adrenal cortex function. This use is traditional within aromatherapy practice and lacks formal clinical RCT evidence.

Suma is documented in Brazilian folk medicine as a traditional remedy for fatigue and exhaustion, classified as an adaptogen and tonic. It is listed among the traditional therapeutic indications for P. paniculata alongside stress and low immune function. Clinical evidence is absent.

Whole adrenal glandular is among the most commonly recommended supplements in integrative medicine for chronic fatigue, framed as support for HPA axis dysfunction presumed to underlie persistent low energy. This traditional use is well-documented in naturopathic literature and functional medicine, including use for ME/CFS-adjacent presentations. No rigorous clinical trials have validated this application.

Brewer's yeast has traditional use in Germany and Europe for fatigue and convalescence, supported by its exceptional B-vitamin content, complete amino acid profile, and minerals. Yarrowia lipolytica yeast in particular has been noted as a dietary supplement for people in recovery. Scientific evidence from dedicated fatigue trials is absent.