Schisandra

Schisandra (Schisandra chinensis): A Comprehensive Reference

1. Identity and Botanical Description

Taxonomy and Nomenclature

Schisandra chinensis (Chinese magnolia vine; five-flavour berry) originates from East Asia, especially from areas of China and Russia. It is a vine from the Schisandraceae family that grows in forests, on mountain slopes, and in areas with a humid climate. Native to northern and northeastern China, eastern Russia, Korea, and Japan, Schisandra is a cold-climate-loving deciduous vine berry. It belongs to the Schisandraceae family, although it was once classified under the Magnoliaceae (magnolia) family; as a result, it may still be encountered under that former classification, referring to the same plant. The full accepted botanical authority name is Schisandra chinensis (Turcz.) Baill.

There are 19 species of Schisandra, but the two main species, Schisandra chinensis and Schisandra sphenanthera, are used interchangeably and mentioned throughout all Traditional Chinese Medicine (TCM) texts. There are two types of fruit of Schisandra that differ in species: one is from S. chinensis, named Wuweizi, and the second belongs to S. sphenanthera, named Nanwuweizi. South Wu Wei Zi is more suitable for the treatment against chronic cough, mild breathlessness, and skin inflammation, while North Wu Wei Zi has better cardiovascular-protective, neuroprotective, and tonic activities.

Common Names and Synonyms

Its Chinese name, wu wei zi, means "five-flavored fruit," reflecting the five flavors recognized in TCM: sour, bitter, sweet, pungent, and salty. The plant is also referred to as schizandra, Chinese magnolia vine, five-flavor berry, and, in Russian and Korean traditions, by cognate transliterations of the Chinese name. More than 100 traditional Chinese medicine prescriptions composed of North Wu Wei Zi and South Wu Wei Zi are documented in the Pharmacopoeia of the People's Republic of China, with various pharmacological activities.

Natural Source and Morphology

A native of Asia, Schisandra is a woody vine that produces bright red fruits at the end of summer; the fruits are then harvested and utilized for their extensive medicinal properties. The dried mature fruits, known as "Northern Schisandra chinensis", are utilized medicinally and acclaimed for their therapeutic efficacy and minimal toxicity in treating various ailments.

Common Forms and Preparations

Traditionally known as Wu Wei Zi, schisandra berries are consumed dried, decocted as teas, or incorporated into multi-herb formulations. Modern products include capsules, tablets, tinctures, and powdered extracts that can be incorporated into beverages and functional foods, offering more standardized dosing compared to whole-fruit preparations. Once the dangling clusters of berries turned red, they were harvested, macerated in alcohol for medicinal consumption, brewed into tea, made into juices, jams, and soups, and dried for later use, much like is done today.

Examples of various doses of schisandra preparations used in official medicine in Russia include the following: Tinctura Fructum Schizandrae, prepared with air-dried fruits and 95% ethanol, given as 20 to 30 drops twice daily. Products containing schisandra extract are often standardized based on specific lignan constituents, such as deoxyschizandrin; standardization ensures consistent levels of active compounds in the supplements.

The American Pharmacopoeia from 1999 has the first monograph on Schisandrae fruit. The plant has also been an official drug in the Russian Pharmacopeia since 1961.

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2. Traditional and Historical Use

Traditional Chinese Medicine (TCM)

Schisandra chinensis is a famous traditional Chinese medicine, which was recorded first in the Shennong Bencao Jing. It has a long therapeutic history of thousands of years and is currently serving in many countries, especially Asian countries. It was first written about in China's first herbal encyclopedia, Shen Nong's Materia Medica, in the first century BC, where it was listed as a Superior Herb. Though schisandra is believed to benefit all functions of the body, it has traditionally been considered to have the most influence on kidney, lung, and liver function.

The Chinese name wu wei zi, meaning "fruit of five flavors," reflects the fact that schisandra incorporates all five tastes (sour, salty, bitter, sweet, and pungent). Because of this distinctive quality, it was thought to be an especially important tonic medicine. With these five flavors, TCM teaches the "Five Element" theory that schisandra berry benefits the five visceral organs: heart, liver, lungs, kidneys, and spleen.

Schisandra has a long history of use in traditional Chinese medicine to treat coughs, liver conditions, stomach disorders, sweating, as an adaptogen, and as a tonic to improve vitality. It is also used in various formulas for fatigue and sleep. In TCM, schisandra is used to "astringe the jing." In practice this is applied where there is excess of secretions such as diarrhea, frequent urination, leucorrhoea, or excess discharge and premature ejaculation. It is also used for excess sweating, such as in menopause and night sweats, often in combination with astragalus (Astragalus membranaceus) and Chinese dogwood (Cornus kousa).

In traditional Chinese medicine the ability of schisandra to promote longevity and vitality is attributed to its tonification of the three treasures: Qi, Jing, and Shen. Traditional use in the aphrodisiac realm pertains to men and the species' ability to prevent premature ejaculation, and it appears in one of the earliest materia medicas, the Shen Nong Ben Cao Jing, as such.

Russian and Soviet Ethnopharmacology

The first studies on the stimulating and tonic effects of Schisandra chinensis were published in Soviet Union World War II military journals. The Russian interest in S. chinensis arises from ethnopharmacological investigations by Komarov (1895) and Arsenyev (1903–1907) in the Far East regions. Since the 1950s, research in the former Soviet Union has explored its potential as an herbal adaptogen and its effects in increasing stamina, endurance, and mental performance. As a result, schisandra is well integrated in herbal practicum throughout Russia.

In Russia, S. chinensis is used as a potent adaptogen, improving disease and stress tolerance, and increasing energy, endurance, and physical performance. The article discusses the wide range of pharmacological effects of Schisandra chinensis that have been validated over more than 40 years of the plant's usage as a legal medicine, with these effects reported in several studies conducted in the former USSR.

Korean and Japanese Use

Schisandra chinensis fruits have been traditionally used for thousands of years in Korea, China, and Japan to treat various ailments. In Korea, schisandra is used in traditional medicine to improve cardiovascular function and a feeble pulse. It is thought to improve blood flow by promoting the health of blood vessels. According to the Korean traditional medical book, Dongui Bogam, S. chinensis is considered a wonder drug that cleans the blood by improving blood circulation and acts as a natural nourishment tonic with medical efficacy.

Chinese, Korean, and Russian cultures have used its berries in a number of ways: in beauty tonic blends, as an ingredient in soups and stews, and infused into wines.

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3. Key Constituents and Active Compounds

Lignans: The Principal Bioactives

Lignans are among the most prominent bioactive constituents of Schisandra chinensis and belong to a class of secondary plant metabolites formed through the oxidative dimerization of two phenylpropanoid units. To date, 86 lignans have been isolated and identified from Schisandra chinensis, with dibenzocyclooctadiene lignans representing the major bioactive constituents.

The most active lignans are dibenzocyclooctadiene derivatives such as schisandrin, schisandrin A, schisandrin B, schisandrin C, gomisin A, gomisin B, gomisin C, gomisin G, gomisin J, and gomisin K3. The major active compounds of S. chinensis are dibenzocyclooctadiene lignans. Schisandrin is the most dominant S. chinensis lignan, found in amounts of 2.2–5.3 mg/g in S. chinensis fruit.

The biological activity and pharmacological use of schisandra are associated with dibenzocyclooctadiene lignans, while specific polysaccharides may also be involved. The lignans of schisandra are genus-specific.

Additional Phytochemical Classes

Chemical investigations also revealed the presence of triterpenoids (lanostane and cycloartane-type triterpenoids and nortriterpenoids), organic acids (citric, fumaric, malic, and tartaric acids), phenolic acids (chlorogenic, gentisic, p-hydroxybenzoic, p-coumaric, protocatechuic, syringic, and salicylic acids), flavonoids (quercetin, isoquercitrin, rutin, and hyperoside), vitamins C and E, phytosterols, and bioelements (Cr, Cu, Co, Ca, Mg, Fe, Zn, Mn, B, Ni). The fruit, rich in active constituents like lignans, organic acids, polysaccharides, and triterpenoids, is traditionally employed for liver protection, immune enhancement, and cardiovascular defense.

Established Mechanisms of Action

These lignans have been extensively documented for their wide range of biological activities, including antioxidant, anticancer, antiaging, antidiabetic, antibacterial/viral, hepatoprotective, immunomodulatory, cardioprotective, and neuroprotective effects. A comprehensive analysis of the pharmacological properties of Schisandra chinensis lignans encompasses antioxidant, anti-inflammatory, neuroprotective, hepatoprotective, antibacterial/viral, antidiabetic, and anticancer effects.

• Antioxidant activity: Schisandra is a potent free radical scavenger, a characteristic that may explain the hepatoprotective effects observed with this botanical.
• Anti-inflammatory signaling: Schisandrin B works by inhibiting the NF-κB inflammatory pathway in liver cells, reducing the cascade of inflammatory damage that characterizes liver disease. Additional research shows schisandrins enhance the liver's natural antioxidant enzymes (glutathione and superoxide dismutase) and stabilize liver cell membranes.
• Hepatoprotective mechanisms: Enhanced cytochrome P450 activity, glutathione production, and glycogen synthesis were also observed, improving detoxification and regeneration capacity. Gomisin A has been found to promote hepatocyte growth factor, limit lipid peroxidation, and inhibit apoptosis in acute hepatic injury animal models. Gomisin A also acts as an anti-inflammatory agent, preventing the release of arachidonic acid by macrophages.
• Neuroprotective mechanisms: Mechanisms include the modulation of neurotransmitter levels, the enhancement of cholinergic function, and the upregulation of neurotrophic factors such as brain-derived neurotrophic factor (BDNF), which plays a crucial role in neuron growth and synaptic plasticity. Schisandra's mechanism of CNS inhibition has been evaluated and may be related to an effect on dopaminergic receptors.
• Adaptogenic and stress-protective mechanisms: Prevention of stress-induced increase in nitric oxide (NO), and the associated decrease in ATP production, results in increased performance and endurance. Adaptogen-induced upregulation of Hsp70 triggers stress-induced JNK-1 and DAF-16-mediated pathways regulating the resistance to stress and resulting in enhanced mental and physical performance.
• Cardiovascular mechanisms: A study of the protective action of three S. chinensis lignans (schisandrin A, B, and C) against myocardial ischemia-reperfusion injury found that the presence of a methylenedioxy group and the cyclooctadiene ring of schisandrin are significant determinants in the protection against myocardial ischemia-reperfusion injury.
• CYP enzyme modulation and detoxification: Fragmentary studies have reported the ability of some lignans to modulate some cytochrome P450 (P450) enzymes. Six dibenzocyclooctadiene lignans—schisandrin, gomisin A, B, C, and N, and wuweizisu C—have been investigated for drug interaction potential on nine P450 enzymes (CYP1A2, 2A6, 2B6, 2C8, 2C9, 2C19, 2D6, 2E1, and 3A) and six UGT enzymes using human liver microsomes.
• P-glycoprotein modulation: Schisandrol A may decrease P-glycoprotein (P-gp) activity to improve drug retention, and schisandrin A appeared to reverse P-glycoprotein-mediated multidrug resistance in certain cancer cell lines.
• Mitochondrial and energy metabolism: In a randomized, double-blind, placebo-controlled trial, quadriceps muscle strength values significantly increased following schisandra administration, and lactate levels significantly decreased in healthy post-menopausal middle-aged women who consumed 1000 mg of S. chinensis extract compared to the placebo group. These effects may have resulted from increased ATPase activity and improved mitochondrial function following S. chinensis extract supplementation.

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4. Scientific Evidence by Area of Use

4.1 Hepatoprotection (Liver Health)

The fruits and seeds of this East Asian liana and other species of the genus are used in Chinese medicine to treat a chronic persistent type of hepatitis. In addition to its antihepatotoxic activity, the drug has been shown to have anticancer, antioxidant, and physical performance improvement properties; clinical effectiveness has yet to be established.

Preclinical evidence: A systematic review and meta-analysis suggest that Schisandra chinensis exhibits hepatoprotective effects through mechanisms including antioxidant, anti-inflammatory, anti-apoptotic, and autophagy-modulating activities. Schisandra extracts decreased inflammatory cytokines and oxidative stress markers and increased endogenous antioxidant activity in animal models. Additional preclinical studies demonstrated attenuated liver enzyme levels, necrosis, and fibrosis progression in chemical-induced hepatotoxicity with schisandra treatment.

Human/Clinical evidence: A total of 100 patients with mild liver injury or dysfunction were included in two studies to assess the impact of schisandra on hepatic outcomes. The trials were conducted in Indonesia and Taiwan. Patients were administered a schisandra extract (7.5 mg daily) or schisandrin B (0.24–0.48 mg) combined with sesamin. The first study, conducted by Ardiyanto et al., found that the schisandra extract was just as effective as a traditional herbal medicine in treating liver disturbances, as evidenced by confirmed results in ALT and AST levels. Small human trials in hepatitis and nonalcoholic fatty liver disease showed improved liver enzymes and symptoms with schisandra supplementation, but were limited in quality and sample size.

A small study in liver transplant patients suggests schisandra may help with the side effect of diarrhea associated with immune-suppressant medication. Another small study in liver transplant patients suggests schisandra can improve liver function. A further small study indicates it may be helpful in combination with other treatments for chronic hepatitis.

Evidence strength: Small human trials report improved liver enzymes and symptoms in certain hepatic conditions, but are limited in quality and sample size. There is currently insufficient clinical evidence from well-designed, large-scale human trials to support schisandra as an effective phytotherapy for liver diseases. The significant heterogeneity among included studies may undermine the reliability of these conclusions. To enable clinical application, further high-quality preclinical studies and well-designed clinical trials are necessary to validate its efficacy and clarify underlying mechanisms of action.

4.2 Adaptogenic Effects: Fatigue, Stress, and Physical Performance

Good scientific evidence has been documented in trials in which Schisandra chinensis and Eleutherococcus senticosus increased endurance and mental performance in patients with mild fatigue and weakness. The clinical trials using Schisandra chinensis (13 studies) and Eleutherococcus senticosus (11 studies) on mental performance in humans have been the subject of a recent systematic review.

Schisandra use for symptoms of asthenia (fatigue and weakness) received a grade B/C recommendation (5 trials; N=406). Evidence levels ranged from IIa to III, reflecting the availability of well-conducted studies but also a lack of randomized trials.

In older adults doing regular low-intensity exercise, preliminary data suggest supplementation with a schisandra extract may enhance skeletal muscle strength, but it did not affect muscle mass. A randomized, double-blind, placebo-controlled trial involving 54 elderly participants reported significant increases in muscle performance without any noted side effects.

In a clinical study, schisandra tablets containing 91.1 mg of extract per tablet (extract standardized for schisandrin and gamma-schisandrin at a level of 3.1 mg/tablet) were used to improve athletic performance.

Evidence strength: Evidence for adaptogenic and anti-fatigue effects is characterized as "good" (B/C level) for mild fatigue and weakness from a 5-trial pool, though methodological quality is variable. Individual studies are often small and may use multi-ingredient combinations that make it difficult to attribute effects to schisandra alone.

4.3 Cognitive Function and Neuroprotection

The fruits contain a variety of bioactive metabolites, especially lignan components, which have been reported to have various biological activities and have potential in the treatment of numerous neurodegenerative diseases. The lignans from S. chinensis are mainly grouped under dibenzocyclooctadiene lignans. Previous studies have reported that crude extracts and isolated pure lignan components effectively protect neuronal cell damage and significantly enhance cognitive performance.

While most of the evidence comes from animal studies, some human studies also support the cognitive benefits of S. chinensis. Traditional uses in Chinese medicine include improving mental clarity and reducing mental fatigue. Modern clinical trials, though limited, have reported improved cognitive performance and reduced symptoms of stress in individuals consuming schisandra extracts.

A double-blind, placebo-controlled, randomized pilot study assessed the effect of a single dose of ADAPT-232 — a standardized fixed combination of Rhodiola rosea, Schisandra chinensis, and Eleutherococcus senticosus extracts — on mental performance, including attention, speed, and accuracy, in tired individuals performing stressful cognitive tasks. A study of this proprietary formulation that included schisandra suggests improved performance of cognitive tasks.

Schisandrin, a principal component, has been demonstrated to modulate intestinal flora, consequently diminishing hippocampal neuron loss and ameliorating the cognitive deficits linked to Alzheimer's disease.

Evidence strength: Other animal studies suggest it may improve mental and physical functioning. Only a small number of studies have been conducted in humans and are too limited to draw any conclusions. Many human studies use multi-herb formulations, making it difficult to isolate the contribution of schisandra specifically.

4.4 Cardiovascular Effects

The berries, leaves, seeds, and roots of S. chinensis, including berry preparations, extracts, and their chemical components, demonstrate anti-cancer, hepatoprotective, anti-inflammatory, and antioxidant properties. These valuable properties, and their therapeutic potential, are conditioned by the unique chemical composition of S. chinensis berries, particularly their lignan content. S. chinensis fruit extract and its lignans are described as promising resources for the development of safe, effective, and multi-targeted agents against cardiovascular diseases.

Among natural compounds, schisandrin B (Sch B), isolated from Schisandra chinensis, was documented to possess diversified pharmacokinetic properties, among them antioxidant activity, anti-inflammation, cardioprotection, and neuroprotection.

A study examining schisandra's effects on hypertension found no recorded side effects, further confirming its short-term safety and tolerability.

Evidence strength: Cardiovascular evidence is predominantly preclinical (in vitro and animal). Clinical research indicates that schisandra, often in combination with other herbs, may be beneficial for congestive heart failure and other cardiovascular conditions. Large-scale human RCTs specifically targeting cardiovascular outcomes are lacking.

4.5 Menopausal Symptoms

In small studies of women, schisandra did not induce significant changes in obesity-related measures, but was helpful for menopausal symptoms. Park et al. also showed the role of schisandra as a medicinal herb for treatment of cardiovascular symptoms associated with menopausal symptoms.

Evidence strength: Early clinical data are encouraging but derive from small studies. Further rigorous trials in this population are needed before conclusions can be drawn.

4.6 Metabolic Effects (Diabetes, Obesity, NAFLD)

Due to its antioxidant, hepatoprotective, and anti-cancer activities, S. chinensis fruit has been used as a traditional medicine for treatment of various cardiovascular or GI ailments in southeastern Asia and Russia. Recently, the interest in its application as a preventive agent against diet-related chronic diseases, such as type 2 diabetes, obesity, or non-alcoholic fatty acid disease (NAFLD), has increased.

Schisandra chinensis polysaccharide (SCAP) has a therapeutic impact in streptozotocin-induced models and this protective influence may be mediated via preventing the apoptosis of beta-cells by inhibiting the expression of phosphor C-Jun N-terminal kinase (JNK) and related apoptotic proteins.

Evidence strength: Preclinical evidence is emerging, and some clinical trials in hyperglycemia have been conducted (referenced in the literature), but the evidence base for metabolic effects in humans remains preliminary and not yet sufficient to establish efficacy.

4.7 Antioxidant Effects

The dried fruits of S. chinensis and their extracts are helpful in the treatment of neurological, cardiovascular, and gastrointestinal disorders, in decreasing fatigue, reducing obesity, and protecting from mitochondrial dysfunction, insomnia, and excessive sweating. They stimulate immunity, act as a tonic, and exert antioxidant, anti-inflammatory, antiviral, anticancer, anti-aging, anti-diabetic, and liver- and skin-protecting activities.

Schisandra's antioxidative action includes induction of the antioxidant enzymes and direct scavenging of reactive oxygen species (ROS) to prevent cancer induction and progression. Pro-oxidant effects lead to increased ROS production in cancer cells and cell death (apoptotic and autophagic).

4.8 Anti-Cancer Potential

Mechanisms of anti-cancer activity of bioactive phytochemicals in schisandra may inhibit tumour progression through cell cycle arrest at G0/G1 and G2/M, suppression of proliferation, invasion, metastasis, and angiogenesis. Gomisin A acts synergistically with paclitaxel in ovarian cancer models, whereas schisandrin B improves the activity of apatinib and 5-fluorouracil (5-FU) in gastric cancer studies.

Evidence strength: Anticancer data are entirely preclinical (in vitro and animal). No human clinical trials on cancer treatment or prevention with schisandra as a standalone agent have been published to a sufficient standard to draw conclusions.

4.9 Respiratory Effects

Schisandra lignans have reported antitussive (cough-suppressing) and respiratory stimulant effects. Although schisandra is used to treat some lung symptoms in traditional Chinese medicine, clinical trials supporting its use for lung problems and coughs are limited.

4.10 Gastrointestinal Effects

The fruits have been used in the treatment of diseases of the gastrointestinal (GI) tract. The traditional use of schisandra to treat diarrhea and indigestion is not yet supported in clinical trials.

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5. Body Systems Associated with Schisandra

The fruits of S. chinensis demonstrate neuro- and hepato-protective, anti-inflammatory, antioxidative, detoxification, immunostimulant, antiviral, and anti-cancer activities, as well as cardiovascular and skin-protective properties. Reviews of the pro-health effects focus primarily on their influence on the central nervous, sympathetic, cardiovascular, endocrine, and respiratory systems, as well as adaptogenic, hepatoprotective, immunostimulant, antioxidant, ergogenic, and anti-stress activities.

• Liver/Hepatic system: Most extensively studied area; evidence for hepatoprotective action via antioxidant, anti-inflammatory, and regenerative mechanisms.
• Central nervous system: Neuroprotective, adaptogenic, cognitive-enhancing, and mild sedative/stimulating effects depending on context.
• Cardiovascular system: Cardioprotective effects observed in preclinical studies; limited human data.
• Immune system: S. chinensis is used to improve liver function, strengthen the immune system, improve physical and mental conditions, and regulate hormonal functions.
• Endocrine system: Schisandra may increase the metabolism of oestrogens and has been shown to reduce serum oestradiol levels.
• Musculoskeletal system: Preliminary evidence for muscle strength enhancement in elderly populations.
• Respiratory system: Traditional use for cough; antitussive effects attributed to lignans.
• Gastrointestinal system: Traditional use for diarrhea and gastric complaints; limited clinical support.

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6. Dosage Forms and Reported Dosages

No universally accepted standardized dose of S. chinensis extract has been established in the current literature, as studies use different preparations, lignan concentrations, and treatment goals. For this reason, product standardization and reporting of key lignans such as schisandrin or gomisin compounds are important when interpreting dose and activity.

The following dosages have been reported in primary sources and referenced literature:

• Schisandra fruit is used as an adaptogen at dosages of 1.5 to 6 g/day of powdered product.
• In a clinical study aimed at improving athletic performance, schisandra tablets containing 91.1 mg of extract per tablet (standardized for schisandrin and gamma-schisandrin at a level of 3.1 mg/tablet) were employed.
• In Russia, preparations used in official medicine include Tinctura Fructum Schizandrae, prepared with air-dried fruits and 95% ethanol, given as 20 to 30 drops twice daily.
• In clinical trials for liver injury, patients were administered a schisandra extract (7.5 mg daily) or schisandrin B (0.24–0.48 mg) combined with sesamin.
• The typical dosage for schisandra extract in some sources is cited as 100 mg twice daily.
• In a randomized, double-blind, placebo-controlled trial for muscle strength, 1000 mg of S. chinensis extract was administered to healthy post-menopausal middle-aged women.

Products containing schisandra extract are often standardized based on specific lignan constituents, such as deoxyschizandrin. Standardization ensures consistent levels of active compounds in the supplements. The clinical application of schisandra compounds is often hindered by challenges such as poor solubility and limited bioavailability, necessitating the development of novel drug formulations to enhance their biological activity and clinical efficacy.

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7. Safety Considerations and Drug Interactions

General Safety Profile

Clinical studies have consistently demonstrated the safety profile of Schisandra chinensis, highlighting its promise as a well-tolerated therapeutic agent. When taken orally, some common side effects of schisandra may include decreased appetite, heartburn, stomach upset, and urticaria (hives).

Gastrointestinal Cautions

Gastroesophageal reflux disease (GERD) or peptic ulcers: schisandra might make these conditions worse by increasing stomach acid.

Central Nervous System Cautions

At least one expert warns against using schisandra in cases of epilepsy. The reason for this warning is not clear, but it may be due to a concern that schisandra could possibly stimulate the central nervous system. There is a concern that schisandra might worsen high intracranial pressure, also potentially due to CNS stimulatory effects.

Pregnancy and Lactation

Information regarding safety and efficacy in pregnancy and lactation is lacking. Schisandra is not recommended for use during pregnancy, lactation, or for young children.

Drug Interactions: Cytochrome P450 Enzymes

One of the most significant concerns for long-term use is schisandra's interaction with the liver's cytochrome P450 enzyme system, which is responsible for metabolizing many medications. Chronic use could potentially alter the metabolism of certain drugs, affecting their efficacy or toxicity. This is a particularly important consideration for individuals on long-term medication for conditions like cancer, blood clotting disorders, or those taking immunosuppressants.

Because of its documented effects on hepatic and gastric enzyme activity, particularly cytochrome P450 (CYP-450) 3A, it is possible that schisandra may interfere with the metabolism of co-administered drugs (e.g., midazolam). Schisandra may increase or decrease drugs metabolized via cytochrome P450 depending on the drug and the patient.

Drug Interactions: P-Glycoprotein and Specific Medications

Findings from a study of healthy volunteers suggest that dosage adjustment may be needed in individuals concomitantly taking P-glycoprotein (P-gp) substrates, such as tacrolimus. Schisandra can interact with certain drugs, including cyclophosphamide, cyclosporine, and various cytochrome P450 substrates. These interactions can affect the levels and clinical effects of these medications.

Schisandra may increase the effects of barbiturates. Schisandra is hepatoprotective; it may prevent liver damage that is sometimes caused by hepatotoxic medications, such as acetaminophen and tetracycline.

Potential Hepatotoxicity at High Doses

It was reported that schisandrin B and schisandrae fructus oil could elevate hepatic and serum triglyceride levels, heighten serum alanine aminotransferase (ALT) activity, and eventually induce hepatotoxicity (hypertriglyceridemia, hepatomegaly, and liver damage) in mice at high doses in animal models. This observation underscores the importance of dose-appropriate use.

Bioavailability Challenges

This comprehensive concern summarizes the effects of Wu Wei Zi extract and its major lignan components on cytochrome P450 and P-glycoprotein activities, the change of which could induce metabolic drug-drug interactions. Additionally, the differences in major lignan components between the two Schisandra species, as well as the absorption, distribution, metabolism, and elimination of the major lignans, have been reviewed.

Information on CYP interaction may aid the prediction of possible drug interactions between Schisandra lignans and any co-administered drugs which are mainly metabolized by P450s.

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References

• PMC: A comprehensive review of Schisandra chinensis lignans: pharmacokinetics, pharmacological mechanisms, and future prospects (2025)
• PubMed: Schisandra chinensis and its phytotherapeutical applications (Nowak et al., 2019)
• PubMed: Current knowledge of Schisandra chinensis (Turcz.) Baill. as a medicinal plant species (Szopa et al., 2017)
• PMC: Antioxidant Effects of Schisandra chinensis Fruits and Their Active Constituents (2021)
• PMC: Potential of Schisandra chinensis in Human Health and Nutrition: A Review of Current Knowledge and Therapeutic Perspectives (2019)
• PMC: A Review of the Biological Activity and Structure–Property Relationships of the Main Compounds from Schisandra chinensis (2025)
• PMC: Effects of Adaptogens on the Central Nervous System and the Molecular Mechanisms Associated with Their Stress-Protective Activity (2014)
• PubMed: Evidence-based efficacy of adaptogens in fatigue, and molecular mechanisms related to their stress-protective activity (Panossian & Wikman, 2009)
• PubMed: Double-blind, placebo-controlled, randomised study of single dose effects of ADAPT-232 on cognitive functions (2010)
• Frontiers in Pharmacology: Efficacy of Schisandra chinensis in liver injury: a systematic review and preclinical meta-analysis (2025)
• Scientific Archives: Schisandra chinensis in Liver Disease: Exploring the Mechanisms and Therapeutic Promise of an Ancient Chinese Botanical (2024)
• PMC: Natural Products as Hepatoprotective Agents — A Comprehensive Review of Clinical Trials (2024)
• PMC: Systematic analysis of the pharmacological function of Schisandra as a potential exercise supplement (2022)
• PMC: Cardioprotective Potential of Berries of Schisandra chinensis Turcz. (Baill.), Their Components and Food Products (2023)
• PMC: A Comprehensive Review on Schisandrin B and Its Biological Properties (2020)
• PMC: Inhibitory Effects of Schisandra Lignans on Cytochrome P450s and UGTs in Human Liver Microsomes (2021)
• PMC: Main Lignan Components of Schisandra chinensis and Schisandra sphenanthera and the Lignan-Induced Drug-Drug Interactions (2022)
• PubMed: An overview of neuroprotective and cognitive enhancement properties of lignans from Schisandra chinensis (2018)
• Memorial Sloan Kettering Cancer Center: Schisandra (Integrative Medicine herb database)
• Drugs.com Natural Products Database: Schisandra Uses, Benefits & Dosage
• RxList: Schisandra — Health Benefits, Side Effects, Uses, Dose & Precautions
• Pharmacognosy Communications: Schisandra chinensis, Five Flavor Berry, a Traditional Chinese Medicine and a Super-Fruit from North Eastern China (2021)
• ScienceDirect Topics: Schisandra chinensis — Overview
• ScienceDirect Topics: Schisandra — Pharmacology Overview
• PMC: The Cytochrome P450-Mediated Metabolism Alternation of Four Effective Lignans From Schisandra chinensis (2018)
• Herbal Reality: Schisandra (Schisandra chinensis) — Benefits, Safety, Uses