Schisandra (Schisandra chinensis)

Mechanism of Action

Schisandra berries contain lignans (schisandrin A, B, C; gomisin A, N) that are the primary bioactives. Schisandrin B is a potent inducer of hepatic Phase I (CYP450) and Phase II (glutathione S-transferase, UDP-glucuronosyltransferase) detoxification enzymes. Schisandra activates Nrf2/ARE pathway, increases glutathione synthesis, and has hepatoprotective effects by stabilizing hepatocyte membranes. It modulates the HPA axis, reduces cortisol, enhances mental performance under stress via cholinergic and catecholaminergic modulation, and improves mitochondrial function through enhanced cytochrome c oxidase activity.

Dosing Protocol

Notes

Schisandra is uniquely valued for its hepatoprotective properties — traditionally called the 'five-flavor fruit' in Chinese medicine. The liver support makes it an excellent component of detoxification protocols alongside milk thistle and NAC. The CYP3A4 interaction profile is the key clinical concern — thorough medication review is required. Used in traditional formulas for improving mental acuity under stress, exercise endurance, and night vision.

Stacking

• Milk Thistle
• NAC
• Rhodiola
• Reishi

Interactions

• CYP3A4 substrates [MEDIUM] — Schisandrin inhibits CYP3A4 — may increase levels of many drugs
• P-glycoprotein substrates (tacrolimus, cyclosporine) [HIGH] — Schisandra inhibits P-gp — significantly increases drug levels
• Warfarin [MEDIUM] — CYP interaction may alter warfarin metabolism

Contraindications

• Pregnancy
• Epilepsy (mixed data — may lower or raise seizure threshold)
• Concurrent use of narrow therapeutic index drugs metabolized by CYP3A4

Side Effects

• GI upset
• Heartburn
• Skin rash
• Reduced appetite
• Rare: CNS depression at very high doses

Key Papers

• 10.3390/molecules22091445
• 10.1016/j.phymed.2010.05.002
• 10.1016/j.jep.2007.01.030

Source Quality

Standardized to total schisandrins (>2%). Berry extract preferred. Schisandra sphenanthera is a related but different species with different lignan profiles. Brands: NOW Schisandra, Gaia Herbs, Nature's Way.

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