Schisandra: What It Is, How It Works, and When to Use It
Schisandra (Schisandra chinensis), known in China as wu wei zi, is a small red berry that has been used in Chinese medicine for around two thousand years. It is traditionally used as a tonic to support energy, stamina and the liver, and it is one of the herbs most often described as an adaptogen. The human research is limited, and the interaction data is more significant than the benefit data, which is a good reason to read this guide properly. It is one of the four herbs in the EarthWise Daily Vitality tonic.
What it is
Schisandra is a woody, deciduous climbing vine in the Schisandraceae family, native to the forests of north-eastern China, the Russian Far East, Korea and Japan. It twines around trees and produces clusters of bright red berries in autumn. The name wu wei zi means five-flavour fruit, because the berries are said to taste sweet, sour, salty, bitter and pungent at once.
The part used is the dried fruit. In Chinese medicine it is classically used as an astringent and tonic berry, to support the lungs, the kidneys and the heart, and to settle excessive sweating. There is a second species, Schisandra sphenanthera, used in Chinese medicine too, with somewhat different chemistry. This guide is about Schisandra chinensis, which is the one in Daily Vitality.
A buyer's note worth reading. Check that the label names the fruit and gives the Latin name Schisandra chinensis, using the full species name, since the two species are not interchangeable. Many supplements are standardised to schisandrins, and the percentage on the label tells you about concentration and not about how well the product will work.
The active compounds
Schisandra fruit contains dibenzocyclooctadiene lignans, such as schisandrin, gomisins and deoxyschisandrin, along with organic acids (the source of the sour taste), essential oil and polysaccharides. The lignans are the compounds most often studied.
The main proposed mechanism: stress response. In animal studies, schisandra extracts change how animals respond to physical and mental stress, and this is what earned the berry its adaptogen label. As with other adaptogens, these are mostly animal and cell findings, and how far they apply to a person is uncertain.
Liver enzymes. In laboratory studies, schisandra lignans interact with the enzymes that metabolise drugs in the liver and with transport proteins in cell membranes. This is the basis of the interaction concerns in the safety section below.
How it is traditionally used
Schisandra has been used in China for a very long time, usually as dried berries simmered in water, as powder or as a wine. Traditional uses include fatigue, coughs, night sweats, thirst and restlessness. It is traditionally used as a tonic to support vitality.
I am not aware of an EU herbal monograph for schisandra fruit, which means there is no formal European assessment of traditional use, doses or safety for me to point to. That is one reason I regard the information in this guide as less settled than for herbs that have one.
In Western herbal practice, schisandra is used as an adaptogenic tonic, often alongside Rhodiola and other stress-supporting herbs. That is the logic behind its place in Daily Vitality.
What the research shows
Here is how the evidence reads.
Traditional evidence: vitality, stamina and general tonic use. This is the main basis for the herb's use, and it rests on a long tradition and not on controlled trials.
Evidence overall. Memorial Sloan Kettering's herb database notes that scientists do not fully understand how schisandra works and that few human studies exist. It describes most of the trials as small, uncontrolled or inconclusive. It mentions small studies in liver transplant patients, in women with menopausal symptoms (a small trial suggesting fewer hot flushes and less sweating) and in older adults who exercise (a possible gain in muscle strength). I regard each of these as a lead for researchers and not as a finding that supports a claim. Most of the other reported effects come from laboratory, animal or cell work.
Interaction evidence. A laboratory study using human liver cells found that extracts of both Schisandra chinensis and Schisandra sphenanthera inhibited CYP3A4/5, a major drug-metabolising enzyme, and reduced the efflux of digoxin through a transport protein called P-glycoprotein. The authors judged S. chinensis more likely to cause clinically relevant interactions because its inhibition builds up with time. Clinical reports link the other species to a rise of more than 60% in blood levels of the transplant drug tacrolimus. These are laboratory results and reports, and no more than a signal, and they are the reason I take the interaction question seriously.
Safety evidence. No serious side effects have been reported, though the herb is not well studied. One small trial noted minor effects, such as sleepiness and cold extremities, in both the schisandra and placebo groups.
Practical guidance
Dose. There is no established tincture dose and no EU monograph to cite. This is not a dosing instruction for any particular product.
Format. A tincture, a standardised fruit extract, a powder or a decoction of the dried berries. The decoction is the traditional form and tastes sharp.
Time to effect. There is no clinical timeline. Herbalists generally allow several weeks to judge a response.
Timing. Morning or early in the day is common, since the herb is traditionally linked to vitality, though I know of no firm evidence that timing matters.
What it does not replace. Schisandra does not replace sleep, food or medical assessment of persistent tiredness. Unexplained tiredness that lasts weeks, weight change or night sweats need a GP.
For how to take the EarthWise tonic specifically, the dose and full safety information are on the product page.
Common questions
What does wu wei zi mean? It means five-flavour fruit, because the berry is described as having sweet, sour, salty, bitter and pungent notes.
Is schisandra an adaptogen? It is often classed as one. The label describes a tradition of thinking about herbs, and it does not mean the herb has been proven to do what the word implies.
Does schisandra interact with medication? It may. Laboratory work and clinical reports suggest it can affect drug-metabolising enzymes and transport proteins, with tacrolimus the best-known example. Please speak to your GP or pharmacist before using it if you take any prescribed medicine, and particularly a transplant medicine, a heart medicine such as digoxin or a medicine with a narrow safe range.
Can I take schisandra with a liver condition? Speak to your GP or practitioner first. Despite its traditional reputation as a liver herb, that is a medical decision and not one to make from a supplement label.
Is schisandra safe in pregnancy? Safety is not established, and the EarthWise guidance advises against Daily Vitality in pregnancy and breastfeeding.
Where schisandra appears in the EarthWise range
Schisandra is one of the four herbs in Daily Vitality, Sarah's formula for long-term energy and resilience, where it sits with Rhodiola, Astragalus and Gotu Kola.
If you are not sure which formula fits, the EarthWise health quiz is the best place to start. Full safety information is on each product page.
Related reading: What Are Adaptogens, and How Do They Actually Work? and Tired of Being Tired? How to Rebuild Your Energy From the Inside Out.
When to seek professional support
Schisandra is generally well tolerated, and the main reason for care is interactions. Check with a practitioner first in these situations:
Any prescribed medicine, especially a transplant medicine such as tacrolimus. Schisandra may raise blood levels.
Heart medicines such as digoxin, or other medicines with a narrow safe range. Laboratory work suggests an effect on transport proteins.
Medicines metabolised by the liver. Laboratory work suggests an effect on the enzyme CYP3A4.
Liver disease. This is a decision for your GP or practitioner.
Pregnancy and breastfeeding. Not recommended.
Immunosuppressant medication. The EarthWise Daily Vitality guidance asks for advice first.
Under 18. There is no guidance on use in children and adolescents, so I would not use it without a practitioner.
Sarah Burt is a registered naturopath, medical herbalist and iridologist with 25+ years of clinical experience. All EarthWise tonics are formulated by Sarah based on her clinical protocols.
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This article is for informational purposes only and is not intended to diagnose, treat or cure any health condition. Always consult a qualified health practitioner before making changes to your health regimen.
