Understanding the stress hormone's impact on metabolism, sleep, immunity, and overall health
Normal cortisol levels depend on the time of day. Generally, cortisol will be low when falling asleep and rise throughout the night, peaking in the morning when the person wakes up. Normal cortisol levels for blood taken at 8 am are 5 to 25 mcg/dL or 140 to 690 nmol/L. Cortisol levels also tend to increase with age and are generally higher in women than men.

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