Herb
Ashwagandha
An adaptogenic herb (Withania somnifera) used in Ayurvedic medicine to support stress resilience, energy, and cognitive function.
Moderate Evidence
Moderate Evidence Nootropic
Lion's Mane
Lion's Mane (Hericium erinaceus) is an edible medicinal mushroom with a distinctive cascading white appearance resembling a lion's mane. It has been used in traditional Chinese and Japanese medicine for centuries, primarily for digestive and neurological support. What sets Lion's Mane apart from other medicinal mushrooms is its unique ability to stimulate the production of nerve growth factor (NGF) and brain-derived neurotrophic factor (BDNF) through its bioactive compounds — hericenones (found in the fruiting body) and erinacines (found in the mycelium). These neurotrophins are critical for the growth, maintenance, and survival of neurons. Human clinical trials, while still limited in number, have shown promising results for cognitive function in older adults with mild cognitive impairment, as well as reductions in anxiety and depression symptoms. The mechanism appears to involve both direct neurotrophic effects and anti-inflammatory modulation in the central nervous system.
Updated March 1, 2026This content is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication regimen.
Benefits & Uses
Stimulates NGF and BDNF production. Improved cognitive function in mild cognitive impairment (human trial data). Reduced anxiety and depression scores. Potential neuroprotective effects against neurodegenerative disease. Anti-inflammatory and antioxidant properties. May support gut health through prebiotic effects.
Side Effects & Precautions
Generally very well tolerated. Rare reports of mild GI discomfort, skin rash, or itching in sensitive individuals. Those with mushroom allergies should avoid. Very rarely, exacerbation of asthma symptoms.
Dosage & Administration
500-3000mg/day of fruiting body extract, or 1000-3000mg/day of mycelium extract. Look for products standardized to beta-glucans (>20%) and/or hericenones/erinacines. Dual extraction (hot water + alcohol) captures both water-soluble beta-glucans and alcohol-soluble terpenoids. Take with food. Effects on cognition may take 4-8 weeks to become noticeable.
Contraindications
Mushroom allergy. Individuals scheduled for surgery should discontinue 2 weeks prior (potential effects on blood clotting). Pregnancy and breastfeeding (insufficient safety data).
Known Interactions
| Substance | Type | Severity | Description |
|---|---|---|---|
| Blood thinners (warfarin, heparin, aspirin) | moderate | Lion's Mane may inhibit platelet aggregation, potentially enhancing the effects of anticoagulant and antiplatelet medications. Monitor for signs of increased bleeding. Discontinue before surgical procedures. | |
| Diabetes medications (metformin, insulin) | minor | Lion's Mane may lower blood sugar levels through alpha-glucosidase inhibition. When combined with diabetes medications, blood glucose should be monitored more frequently to avoid hypoglycemia. |
Sources
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Health Disclaimer
This content is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication regimen.