Testing your diurnal cortisol curve reveals if you are in "Acute Stress" (High Cortisol) or "Exhaustion" (Low/Flat Cortisol). The treatment for each is different. You cannot manage what you do not measure.

Understanding your specific curve allows for targeted chronotherapy: dosing adaptogens in the morning to boost a flat curve, or phosphatidylserine in the evening to blunt a high curve. Blindly treating "adrenal fatigue" can often make the problem worse.

Healthy cortisol should be high in the morning (Cortisol Awakening Response) and low at night. A "reversed curve" (low morning, high night) is a classic sign of HPA axis dysfunction.

Testing helps determine if you need to support adrenal output (licorice, rhodiola) or suppress evening cortisol (phosphatidylserine, ashwagandha).