AMA #3: Adaptogens, Fasting & Fertility, Bluetooth/EMF Risks, Cognitive Load Limits & More
This lively discussion dives into the fascinating world of adaptogens and their role in stress management. It highlights key supplements like ashwagandha and lion's mane, focusing on how they help regulate cortisol levels. The conversation also covers the effects of caloric restriction on fertility and examines the potential risks associated with Bluetooth and EMF exposure. Additionally, listeners learn about cognitive load limits and the implications of creatine on aging—wrapping up with practical tips for enhancing overall well-being.
Top snips
What are adaptogens?
1:29 – 2:09
Adaptogens = anything that buffers stress — from food to supplements to behaviors.
Three main categories: nutritional (vitamins, dark leafy greens), supplement compounds (herbs, mushrooms), and behavioral tools (meditation, breathwork).
Aim: modulate cortisol timing/level to improve sleep, recovery, and performance.
— Andrew Huberman
Eat for stress resilience
5:42 – 6:12
Include 2–4 servings of dark leafy greens or cruciferous veg daily.
They supply antioxidants and anti-inflammatory micronutrients that act as nutritional adaptogens.
Avoid overcooking — save the cooking liquid to retain nutrients.
Also: don’t under-eat — excessive calorie restriction raises cortisol and stress.
— Andrew Huberman
Top supplement adaptogens (short-term)
11:43 – 17:55
Best evidence for buffering cortisol: ashwagandha, lion’s mane, chaga.
Ashwagandha: 300 mg twice daily (600 mg) reduces serum cortisol within ~15–45 days.
Lion’s mane: ~1000 mg/day; Chaga: 500–1500 mg/day — may lower inflammatory cytokines and aid cognition.
— Andrew Huberman
How to use ashwagandha safely
13:54 – 16:15
Take 250–300 mg twice daily in the late afternoon and evening — avoid morning dose to preserve the morning cortisol peak.
Don’t take before exercise (exercise-induced cortisol drives adaptation).
Cycle: use up to ~30–45 days, then take 2–4 weeks off to avoid chronic cortisol suppression.
Behavioral adaptogens: fast, free, effective
10:39 – 27:45
Behaviors can be powerful adaptogens: morning sunlight, short cold exposure, exercise, and brief mindfulness or breathwork.
Even 5–10 minutes of meditation/NSDR or a quick physiological sigh reduces stress.
"The fastest way we know to buffer stress...is the so-called physiological sigh."
— Andrew Huberman
Practical rules & measurements
18:17 – 29:36
Combine nutrition, behavior, and selective supplements — don’t rely on pills alone.
Measure benefits by: better sleep, reduced subjective anxiety, and lower daytime cortisol when tested.
Use single-ingredient supplements to find what helps you, and avoid chronic cortisol “zeroing”—modulation is the goal, not elimination.