Schisandra — The Liver-Protective Adaptogen
Schisandra chinensis is a traditional adaptogenic berry recognised for its hepatoprotective and stress-resilience properties. In the context of longevity, it is investigated for its capacity to enhance endogenous antioxidant defences, modulate inflammation, and protect against age-related decline in hepatic and musculoskeletal function.
Mechanism of Action
The primary active compounds in Schisandra, dibenzocyclooctadiene lignans such as schisandrin and gomisin, exert cytoprotective effects by upregulating endogenous antioxidant systems including glutathione and superoxide dismutase. They activate the Nrf2/ARE pathway, driving the expression of phase II detoxifying enzymes and mitigating oxidative stress. Furthermore, Schisandra lignans inhibit NF-κB signalling to reduce systemic inflammation, and preclinical models suggest they may support mitochondrial function and AMPK activation, thereby promoting metabolic homeostasis.
Human Trial Evidence
Human evidence for Schisandra specifically regarding longevity is limited, though clinical trials have evaluated its effects on physical performance and liver health. A 12-week trial in older adults demonstrated that Schisandra extract supplementation improved muscle strength and mass. However, robust, large-scale human trials directly assessing lifespan or broad healthspan extension are currently lacking.
Dosing Protocol
Typical dosing ranges from 1.5 to 6 g/day of dried fruit powder, or 500–2,000 mg/day of standardised extract, often taken in divided doses with meals. Optimal dosing for specific longevity outcomes in humans remains unestablished.
Safety & Contraindications
Schisandra is generally well-tolerated at standard dosages. Mild adverse effects may include gastrointestinal upset, heartburn, and decreased appetite. It can interact with medications metabolised by the cytochrome P450 system (particularly CYP3A4), potentially altering their clearance. It is contraindicated during pregnancy due to potential uterine stimulation.