Cortisol has become the internet's favorite villain. In reality, it is a hormone you need every single day. Here's what it does, how its daily rhythm works, and what's worth knowing before you buy anything promising to 'fix' it.
Written by Vita Globe Editorial Team | Reviewed against NIH and National Library of Medicine guidance and peer-reviewed research
What is cortisol and what does it do?
Cortisol is a hormone made by your adrenal glands. It helps your body respond to stress, control blood sugar and metabolism, reduce inflammation and regulate blood pressure[1]. Levels are normally highest in the morning and much lower by late afternoon[1], with an extra rise in the first 30 to 45 minutes after waking[2].
Caveat: Cortisol isn't 'bad.' Only a medical test can show whether your levels are truly abnormal, and online symptom checklists can't[1].
Sources: MedlinePlus · Stalder et al., 2016 · Verified 2026-09-27
IN THIS ARTICLE
What does cortisol do in the body?
Cortisol is often called the stress hormone, but that undersells it. According to the National Library of Medicine, it helps your body respond to stress, reduce inflammation, control blood glucose and metabolism, and control blood pressure. It affects nearly every organ and tissue[1].
When something stressful happens, cortisol helps make energy available so you can deal with it. In short bursts, that's a helpful response. Problems are more likely when stress stays switched on for long stretches.
Why is cortisol highest in the morning?
Cortisol follows a daily rhythm. It's normally at its highest in the morning and much lower by around 4 p.m., which is why doctors often test it at set times[1].
On top of that baseline, most people have a sharp rise in cortisol in the 30 to 45 minutes after waking, called the cortisol awakening response[2]. It's thought to help you get going for the day.
Interestingly, that morning rise seems to respond to what's ahead. In a large study of British civil servants, the awakening response was bigger on work days than on weekends[3]. Your body appears to anticipate the day.
| Time of day | Typical cortisol pattern |
|---|---|
| Shortly after waking | Sharp rise (the awakening response)[2] |
| Morning | Normally highest[1] |
| Late afternoon | Normally much lower[1] |
| Evening | Continues winding down toward night |
Is 'adrenal fatigue' real?
You'll see a lot of content about "adrenal fatigue," the idea that chronic stress wears out your adrenal glands. A systematic review looked at the research and concluded there is no evidence that adrenal fatigue is an actual medical condition[4].
That doesn't mean feeling exhausted and stressed isn't real. It just means the explanation is probably something else, and it's worth talking to a doctor, not diagnosing yourself from a checklist. Real cortisol disorders such as Cushing's syndrome and Addison disease are diagnosed with proper testing[1].
Can you lower cortisol naturally?
Your stress response isn't something to eliminate, but everyday habits can help it settle: regular sleep and wake times, exercise, limiting caffeine and staying connected with people. None of these are dramatic, but together they shape how stressed your days feel.
Ashwagandha is one of the few supplements with trials measuring cortisol. In an 8-week randomized trial, adults taking ashwagandha root extract had lower stress scores and lower serum cortisol than those on placebo[5]. Another randomized trial found reduced morning cortisol with a different extract[6]. The NIH Office of Dietary Supplements summarizes that ashwagandha extracts may lower stress, anxiety and cortisol, while noting that studies are small and short[7].
Worth knowing: those trials generally used standardized extracts at 225mg to 1,250mg per day[7]. More background is in ashwagandha for stress: what the research actually shows.
The honest summary
- Cortisol is essential. It isn't the enemy.
- It peaks in the morning and falls through the day. That rhythm is normal.
- "Adrenal fatigue" isn't a recognized medical condition.
- Sleep, movement and stress habits come first. Ashwagandha has early, promising trial data.
Our option
Vita Globe Calm & Stress Relief Bundle
Our bundle pairs Ashwagandha Gummies (25mg of a 30:1 ashwagandha root extract per gummy, tart cherry flavored, pectin-based, one gummy a day at any time that suits you) with our Melatonin 5mg Gummies (5mg of melatonin per serving, taken in the evening before bed) for the evening. The ashwagandha amount in a gummy isn't the same as the higher extract doses used in most trials, so think of it as part of a daily routine rather than a copy of a study protocol. Every Vita Globe product is tested by an independent third-party lab.
Frequently asked questions
What are signs of high cortisol?
Symptoms linked to true cortisol excess, as in Cushing's syndrome, are medical issues diagnosed with testing, not symptom lists[1]. If you're concerned, ask your doctor about a cortisol test.
What time of day is cortisol highest?
Normally in the morning, with a sharp rise in the first 30 to 45 minutes after waking[2]. Levels are much lower by late afternoon[1].
Does stress raise cortisol?
Yes. Cortisol is part of how your body responds to stress[1]. Even anticipating a work day is linked to a bigger morning cortisol rise than on weekends[3].
Does ashwagandha lower cortisol?
Some randomized trials found lower cortisol with ashwagandha extract compared with placebo[5][6], but the studies are small and short[7]. See is ashwagandha safe? before starting.
Is adrenal fatigue the same as high cortisol?
No. Adrenal fatigue is not a recognized medical diagnosis, according to a systematic review of the evidence[4].
Sources
- MedlinePlus (National Library of Medicine). Cortisol Test. Updated December 23, 2024. medlineplus.gov
- Stalder T, Kirschbaum C, Kudielka BM, et al. Assessment of the cortisol awakening response: expert consensus guidelines. Psychoneuroendocrinology. 2016;63:414-432. doi:10.1016/j.psyneuen.2015.10.010
- Kunz-Ebrecht SR, Kirschbaum C, Marmot M, Steptoe A. Differences in cortisol awakening response on work days and weekends in women and men from the Whitehall II cohort. Psychoneuroendocrinology. 2004;29(4):516-528. doi:10.1016/S0306-4530(03)00072-6
- Cadegiani FA, Kater CE. Adrenal fatigue does not exist: a systematic review. BMC Endocr Disord. 2016;16(1):48. doi:10.1186/s12902-016-0128-4
- Salve J, Pate S, Debnath K, Langade D. Adaptogenic and anxiolytic effects of ashwagandha root extract in healthy adults: a double-blind, randomized, placebo-controlled clinical study. Cureus. 2019;11(12):e6466. doi:10.7759/cureus.6466
- Lopresti AL, Smith SJ, Malvi H, Kodgule R. An investigation into the stress-relieving and pharmacological actions of an ashwagandha (Withania somnifera) extract. Medicine (Baltimore). 2019;98(37):e17186. doi:10.1097/MD.0000000000017186
- NIH Office of Dietary Supplements. Ashwagandha: Is it helpful for stress, anxiety, or sleep? Health Professional Fact Sheet. Updated May 2, 2025. ods.od.nih.gov
About the Vita Globe Editorial Team
The Vita Globe Editorial Team researches and writes our wellness content, working from peer-reviewed research, systematic reviews and guidance from bodies such as the NIH and the FDA. We cite our sources inline and update articles when the evidence changes.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. This article is for informational purposes only and is not a substitute for medical advice. Talk to your healthcare provider before starting any new supplement, particularly if you are pregnant, nursing, taking medication, or caring for a child.
