Schisandra and cancer

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Summary of Schisandra

Effect:

• Schisandra is a herb that helps the body resist stress. It works primarily by protecting the liver, functioning as a powerful antioxidant, and dampening inflammation in the body.

Potential in cancer:

• Research suggests that Schisandra can inhibit cancer cell growth and cause them to die. It can also protect the body’s healthy cells from damage caused by chemo- and radiation therapy and potentially make chemotherapy more effective. Check with your healthcare provider that it does not counteract your current treatment.

Main limitation:

• The primary limitation is that Schisandra can affect how the body metabolizes certain types of medication, especially blood thinners. You should therefore talk to your healthcare provider before you start taking it.

Summary:

• Schisandra is a versatile herbal supplement that can support the body on many levels during a cancer course. It can provide more energy, improve mental clarity, protect the liver, and strengthen the body’s general resistance, which can contribute to a better quality of life.

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What is Schisandra

Schisandra (Schisandra chinensis) is a climbing plant native to the forests of northern China and the easternmost part of Russia. The plant is best known for its small, bright red berries, which are highly valued in traditional medicine.

The Chinese name for the berry, Wu Wei Zi, means “five-flavor fruit,” because the berry is said to possess all five basic tastes: sweet, sour, salty, bitter, and umami (savory). This comprehensive taste profile also reflects its complex pharmacological properties.

Schisandra is classified as an adaptogen. An adaptogen is a natural substance that helps the body adapt to various forms of stress, whether physical, chemical, or biological. Instead of having a specific effect, adaptogens work by normalizing the body’s functions and strengthening systems that have been weakened by stress. This makes Schisandra a valuable herb in a holistic approach to well-being, especially when the body is under pressure, as is the case during a cancer course.

History

The use of Schisandra can be traced back thousands of years in traditional Chinese medicine (TCM), where it is one of the 50 fundamental herbs. It was considered a herb that could promote vitality and prolong life. It was used to strengthen the body’s Qi (life energy), nourish the kidneys, calm the heart and mind (Shen), and protect the liver.

Hunters and people in Siberia used it to combat fatigue and improve night vision during long expeditions.

In Russia, it has in recent times been the subject of intensive research for its ability to improve physical and mental performance in soldiers and athletes.

Mechanisms of action

Schisandra’s effect is primarily attributed to a group of bioactive substances called lignans, the most well-known of which are schisandrin A, B, and C. These substances exert a wide range of positive effects on the body’s systems.

Adaptogenic properties

As an adaptogen, Schisandra works by modulating the body’s stress response system, especially the hypothalamus-pituitary-adrenal (HPA) axis. In chronic stress, this axis can become dysfunctional, leading to abnormal levels of the stress hormone cortisol. Schisandra helps normalize cortisol levels, which can improve sleep, reduce anxiety, and increase resistance to stress. This is crucial in a cancer course, where the psychological and physical pressure can be enormous.

Powerful antioxidant and cell protection

Schisandra lignans are potent antioxidants. They protect cells from damage caused by free radicals (unstable molecules that can damage cell structures such as DNA). Even more importantly, Schisandra not only functions as a direct antioxidant but also stimulates the body’s own production of one of the most important antioxidants, glutathione. By increasing glutathione levels, especially in the liver, Schisandra improves the body’s ability to detoxify and protect itself from the oxidative damage associated with both cancer disease and its treatment.

Liver-protective (hepatoprotective) effect

One of the most well-documented effects of Schisandra is its ability to protect and regenerate liver cells (hepatocytes). It activates enzymes in the liver that are responsible for detoxification (Phase I and Phase II detox pathways) and increases the production of glutathione, which is crucial for neutralizing toxins. This property is particularly relevant, as many forms of chemotherapy are a major burden on the liver.

Anti-inflammatory effect

Chronic inflammation is a driving force behind the development and progression of many cancers. Schisandra’s lignans have been shown to be able to inhibit the body’s inflammatory processes. They do this by downregulating the production of pro-inflammatory signaling molecules such as cytokines and inhibiting the activation of the central inflammatory regulator, NF-κB (Nuclear Factor-kappa B). By dampening inflammation, Schisandra creates a less favorable environment for cancer cell growth.

Potential in cancer

Schisandra’s potential as a complementary treatment lies in its ability to intervene in several processes that are central to cancer development, as well as to strengthen the body and alleviate side effects from conventional treatment.

Direct cancer-inhibiting effects

Research, primarily in vitro (test tubes/petri dishes) and in vivo (in living organisms), has shown that Schisandra’s active substances can have a direct effect on cancer cells.

• Induction of apoptosis (programmed cell death): Healthy cells have a built-in mechanism to die when they get old or damaged. Cancer cells have lost this ability. Lignans from Schisandra have been shown to be able to reactivate this process in various cancer cell lines and thus cause cancer cells to commit suicide. This applies to cancer cells in these cancer types:
  • Liver cancer
  • Breast cancer
  • Lung cancer
• Inhibition of cell growth and spread: Schisandrin B, one of the primary lignans, has shown the ability to stop the cancer cell cycle so that they cannot divide and thus cannot reproduce. In addition, studies indicate that Schisandra can inhibit angiogenesis (the formation of new blood vessels, which tumors particularly need in order to grow) and metastasis (the spread of cancer to other parts of the body).

Synergy with and protection against chemotherapy

Schisandra shows remarkable potential in interaction with conventional treatment.

• Overcoming chemoresistance: Some cancer cells develop resistance to chemotherapy by using a pump (P-glycoprotein) to actively push the medication out of the cell.
  Research indicates that Schisandra can inhibit this pump, making cancer cells more sensitive to the treatment and potentially improving the effect of chemotherapeutic drugs such as doxorubicin and paclitaxel.
• Reduction of side effects: By protecting the liver and kidneys from the toxic effects of chemotherapy, Schisandra can help reduce some of the most burdensome side effects. Its antioxidant properties also protect healthy cells from the damage that both chemo- and radiation therapy can cause, which can lead to improved quality of life during treatment.

Benefits of Schisandra

In addition to the more direct mechanisms of action, Schisandra offers a number of general benefits that are valuable for anyone undergoing a cancer course.

Increased energy and resistance

Cancer-related fatigue is one of the most common and disabling side effects. As an adaptogen, Schisandra helps combat fatigue by improving the body’s energy metabolism at the cellular level and increasing physical endurance, without being a stimulant like caffeine.

Improved mental clarity and sleep

The mental fog that often follows with disease and treatment can be alleviated by Schisandra’s ability to reduce stress and improve cognitive function.

By calming the nervous system, it can also promote deeper and more restorative sleep.

Strengthening of the immune system

A well-functioning immune system is crucial. Schisandra acts as an immune modulator, meaning it helps balance the immune system. It can strengthen a weakened immune system and dampen an overactive response, which contributes to the body’s overall defense.

Disadvantages and limitations

Although Schisandra has many benefits, there are important considerations. The primary limitation is that most of the cancer-specific research has been conducted in laboratories and on animals. There is a lack of large, human clinical trials that can determine its precise effect and optimal dosage in connection with a cancer treatment course.

Another significant consideration is the potential for interaction with medication. Because Schisandra affects the liver’s enzymes (specifically the Cytochrome P450 system), it can theoretically alter the metabolism and effect of certain medications, including blood-thinning medications such as Warfarin and certain types of chemotherapy.

Therefore, you should discuss the use of Schisandra with your healthcare provider before you start taking it.

Clinical trials

While large clinical trials with cancer patients are limited, there are human studies that support Schisandra’s effects in areas relevant to cancer treatment.

Studies have confirmed its liver-protective effects in people with liver diseases and its ability to improve physical and mental performance in healthy individuals under stress.

A small study on cancer patients receiving chemotherapy suggested that a preparation containing Schisandra could improve quality of life and reduce fatigue.

These studies are preliminary but point to the same beneficial mechanisms seen in laboratory research.

Safety

Schisandra is generally considered a very safe herb with few side effects at recommended doses. The most common side effects are mild and may include decreased appetite, mild stomach discomfort, or skin rash.

People who are pregnant or breastfeeding should avoid Schisandra, as there is not sufficient knowledge about safety.

Similarly, people with autoimmune diseases, such as rheumatoid arthritis or multiple sclerosis, should exercise caution, as Schisandra can stimulate the immune system.

The most important safety measure is to inform your healthcare provider about the use, especially if you are receiving other medical treatment.

Dispensing and use

Schisandra is found in several different forms. The choice depends on personal preference and the purpose of the treatment.

• Dried berries: Whole berries can be chewed directly (the taste is intense) or used to make tea. This is the most traditional form of use.
• Powder: Dried, powdered berries can be easily added to smoothies, yogurt, or other foods. This provides an easy way to ingest the whole herb.
• Tincture/Liquid extract: This is a concentrated form where the active substances are extracted in alcohol or glycerin. It allows for flexible dosing and quick absorption.
• Capsules/Tablets: These often contain a standardized extract, which ensures a consistent amount of the active lignans in each dose. This is often the preferred form for a targeted, therapeutic effect.

Conclusion

Schisandra is a versatile and powerful adaptogenic herb with a rich history and significant scientific potential.

Its ability to protect cells from oxidative stress, dampen inflammation, strengthen the liver, and regulate the body’s stress response makes it highly relevant as a complementary treatment in a cancer course.

Research also points to it having direct cancer-inhibiting effects and working in synergy with conventional treatment by enhancing its effect and reducing its side effects.

Although there is a need for more research on humans, Schisandra offers holistic support that can improve the body’s resistance, increase energy levels, and improve overall quality of life during the demanding journey that a cancer course is.

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Links

[1] Insights Into Anticancer Mechanisms of Schisandrin B: Isolation, Pharmacokinetics, and Preclinical Evidence (PubMed, 2025)

• Content: In vitro and in vivo study showing that schisandrin B, a plant compound from Schisandra chinensis, has potent anti-cancer activity by promoting cell apoptosis, inhibiting cell growth, and regulating growth signals through several molecular pathways. It can improve the effect of chemotherapy and has potential as a new therapeutic approach against cancer, although oral administration has limited bioavailability.

[2] Schizandrin A promotes apoptosis in prostate cancer by inducing ROS-mediated endoplasmic reticulum stress and JNK MAPK signaling activation (PubMed, 2025)

• Content: In vitro and in vivo study showing that schizandrin A (SchA), a compound from Schisandra chinensis, inhibits the growth of prostate cancer cells by stopping the cell cycle and inducing apoptosis. It works through increased ROS production, ER stress, and activation of JNK signaling pathways. In animals, SchA also showed effective inhibition of tumor growth, suggesting potential as a cancer treatment.

[3] A comprehensive review of Schisandra chinensis lignans: pharmacokinetics, pharmacological mechanisms, and future prospects in disease prevention and treatment (PubMed, 2025)

• Content: Review article examining the lignans from Schisandra chinensis, which have many medicinal properties, including anti-inflammatory, antioxidant, neuroprotective, and cancer-inhibiting effects. Challenges with absorption and bioavailability can be improved with new delivery methods. Research into combination therapies and mechanisms may open up new treatments in the future.

[4] Schisandrin B downregulates exosomal fibronectin 1 expression to inhibit hepatocellular carcinoma growth (PubMed, 2025)

• Content: In vitro study showing that schisandrin B (Sch B) can inhibit the growth of liver cancer cells by stopping the cell cycle and reducing migration. It also affects the FN1 protein in exosomes, which promotes M1 macrophage polarization and inhibits tumor development. The research suggests that Sch B can prevent liver cancer through interactions between macrophages and cancer cells.

[5] Schisandrin B exerts anti-colorectal cancer effect through CXCL2/ERK/DUSP11 signaling pathway (PubMed, 2025)

• Content: In vitro study showing that schisandrin B (Sch B) has been shown to inhibit the growth, invasion, and migration of colorectal cancer cells by suppressing the ERK/MAPK pathway. It also affects metabolism in cells, especially arginine and proline metabolism. The analysis points to DUSP11 as a key molecule that connects the ERK pathway and the cells’ metabolic changes, which may explain Sch B’s anti-cancer effect. More research is needed to confirm the mechanism.

[6] Identification of sinensetin as a selective inhibitor for mitogen-activated protein kinase kinase 6 and an anticancer agent for non-small cell lung cancer (PubMed, 2025)

• Content: In vitro study showing that sinensetin, a natural substance from Schisandra sphenanthera, acts as a specific inhibitor of MKK6 and can inhibit the growth of non-small cell lung cancer (NSCLC). It causes cell cycle arrest in the G1 phase by reducing the MAPK signaling pathway. Sinensetin has potential as a treatment for NSCLC, especially since MKK6 is highly expressed in patients, and genetic removal of MKK6 abolishes the effect.

[7] Bioavailability and interactions of schisandrin B with 5-fluorouracil in a xenograft mouse model of colorectal cancer (PubMed, 2025)

• Content: In vivo study showing that schisandrin B (Sch B) from Chinese medicine can improve the effect of chemotherapy against colorectal cancer by increasing the absorption and breakdown of both Sch B and 5-FU. At the same time, resistance genes such as MDR1 are downregulated, which can increase the effectiveness of the treatment. This shows that Sch B has potential as a valuable adjuvant in cancer treatment.

[8] Schisanhenol Inhibits the Proliferation of Hepatocellular Carcinoma Cells by Targeting Programmed Cell Death-ligand 1 via the STAT3 Pathways (PubMed, 2025)

• Content: In vitro study showing that schisanhenol, a compound from Schisandra rubriflora, can inhibit the growth of liver cancer cells by downregulating PD-L1 through blocking the STAT3 pathway. It also increases the immune system’s ability to attack tumors. The research shows that schisanhenol has potential as a new treatment for liver cancer.

[9] Schisandrin C inhibits AKT1-regulated cell proliferation in A549 cells (PubMed, 2024)

• Content: In vitro study showing that schisandrin C can inhibit the growth of lung cancer cells by downregulating the AKT1 signaling pathway, which reduces cell proliferation and survival. It shows potential as a new treatment for lung cancer, especially since AKT1 is highly expressed in tumor tissue.

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Page created: July 6, 2025

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