← All free guides

Free guide · The stress axis

Cortisol and the Stress Axis

Why your stress response feels different in your 40s, why “adrenal fatigue” is not the explanation, and what I measure and change instead.

PDF · short read

What's inside

  • How falling progesterone and estrogen change the way the HPA axis responds to stress
  • What the research says about “adrenal fatigue”, and the real diagnoses to rule out
  • The tests I use and what moves the needle: sleep, protein, light, training load
  • When to see someone rather than keep self-managing

Educational content only. Not medical advice. Dr. Talina Hermann is a functional-medicine practitioner; please discuss testing and treatment decisions with your own clinician.

Back to all guides  ·  Privacy  ·  Disclaimer

Optimized Human LLC  ·  Los Angeles, CA