Adaptogens
Plants that modulate the stress response and allostatic load
Definition
Adaptogens are a group of medicinal plants that increase the body's resistance to physical, chemical, and biological stress by modulating the hypothalamic-pituitary-adrenal (HPA) axis and cortisol release. The most-studied in longevity are Ashwagandha (Withania somnifera), Rhodiola rosea, Panax ginseng, and Schisandra chinensis. Unlike stimulants, they don't push the body in one direction — they adjust up or down depending on the underlying physiological imbalance.
Detailed explanation
The term was coined by Soviet pharmacologist Nikolai Lazarev in 1947 and formalised by Israel Brekhman. To be classified as an adaptogen, a plant must meet three criteria: be innocuous, show non-specific improvement of stress resistance, and possess a normalising effect.
Mechanisms of action include modulation of salivary and night-time cortisol, activation of the Nrf2 pathway (endogenous antioxidant defence), regulation of neurotransmitters (serotonin, dopamine, GABA), and improved mitochondrial efficiency. Clinical trials published in Phytomedicine and Medicine (Baltimore) show 23-28% cortisol reductions with Ashwagandha (KSM-66, 600 mg/day for 60 days) and significant improvements in sleep quality and subclinical anxiety.
Advanced longevity protocols use cyclic combinations (4-6 weeks on, 1-2 weeks off) to avoid receptor downregulation. Drug interactions with immunosuppressants, anticoagulants, and antidiabetics require medical prescription.
Scientific sources
- PubMed — Adaptogens in stress-induced fatigue and anxiety: a comprehensive review
- PubMed — Efficacy and safety of Ashwagandha root extract on anxiety and stress (KSM-66 RCT)
- PubMed — Rhodiola rosea for physical and mental fatigue: a systematic review
- PubMed — Adaptogens exert a stress-protective effect by modulating expression of molecular chaperones
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