What is Cortisol?
Cortisol is the body's main stress hormone, released by the adrenal glands to mobilise energy and keep you alert. In a healthy rhythm it peaks in the morning and falls away through the evening.
Cortisol is often discussed opposite calming signals such as GABA and against the daily pattern that shapes sleep architecture. It is the hormone that adaptogens like ashwagandha are most associated with, and its evening level has a direct bearing on how easily deep sleep begins. Cortisol is neither simply good nor bad, since timing is what matters.
Understanding cortisol helps anyone who feels wired at night or flat in the morning. The catch is that cortisol is only one thread in a wider stress and sleep system, and a single reading tells you little because levels swing across the day. Chasing lower cortisol at all costs can backfire, since the morning rise is what gets you going.
If evening stress is disrupting your wind-down, see our Ashwagandha Plus.
Frequently asked questions
How is it different from adrenaline?
Adrenaline drives the immediate fight-or-flight surge and clears within minutes. Cortisol acts more slowly and stays elevated for longer, shaping energy and mood across hours.
Who uses it, or when is it the right focus?
People with disrupted sleep, shift patterns or long-running stress often focus on cortisol timing. It is the right lens when the problem is rhythm, such as feeling alert exactly when you want to sleep.
When is it the WRONG focus?
Fixating on cortisol is unhelpful when a sleep problem is behavioural or environmental, such as screens or caffeine. Addressing those usually matters more than the hormone itself.