How to Lower Cortisol Naturally: What Works and How to Test It

The evidence-backed ways to lower high cortisol: sleep, training load, caffeine and alcohol timing, and stress practices. Plus what supplement research shows, the red flags that need a clinician, and which cortisol test answers which question.

Published

September 28, 2026

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14 min read

Medically reviewed by

Rhonda Collins, FNP-C

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The most reliable ways to lower cortisol are the unglamorous ones. Protect your sleep, keep hard exercise away from the hours you need to wind down, stop caffeine at least six hours before bed, drink less alcohol, and use a stress practice you will actually keep up. Supplements have weaker evidence than most marketing suggests. Ashwagandha has the most trial data, and its certainty is still rated low.

Two things matter before you start. First, know which test you are looking at, because a single morning blood cortisol and a Cushing’s syndrome screen are different tests that answer different questions. Second, recognize the handful of physical signs that mean high cortisol needs a medical workup rather than lifestyle changes.

This guide covers the levers with evidence, what supplement research does and does not show, the red flags, and which cortisol test answers which question.

What “high cortisol” usually means

Cortisol is a hormone made by the adrenal glands. It follows a daily rhythm: it peaks in the morning, falls through the afternoon, and reaches its low point around midnight [1][2]. Stress, exercise, illness, pregnancy, and some medicines, including birth control pills, all shift the level at any given moment [2].

When people search for how to lower cortisol, they usually mean one of three situations:

• Stress-related elevation. Poor sleep, heavy alcohol use, depression, and sustained psychological stress can raise cortisol without any disease of the adrenal or pituitary glands [1][2]. This is where lifestyle changes apply.
• Medication. Long-term, high-dose glucocorticoid medicines such as prednisone are the most common cause of Cushing’s syndrome [3]. Do not stop a prescribed steroid on your own to change a cortisol result.
• Cushing’s syndrome from a tumor. A pituitary, adrenal, or other tumor can make the body produce too much cortisol. This needs diagnosis and treatment, not lifestyle changes alone [1].

For the full list of symptoms, see high cortisol symptoms. For what sustained high cortisol does to the body over time, see the dangers of high cortisol.

Evidence-backed ways to lower cortisol

Each lever below is backed by human studies that measured cortisol directly. The size of each effect belongs to the study that produced it. None of them predicts a personal result.

Protect your sleep

Short sleep raises cortisol the next evening. In a controlled study of healthy young men, one night of partial sleep (4 hours) or no sleep raised evening cortisol the next day by 37% and 45%, and delayed the nightly drop in cortisol by at least an hour [4]. That study was small and short, but it points to the lever with the clearest mechanism: regular, sufficient sleep lets cortisol reach its normal nighttime low.

Practical steps are consistent sleep and wake times and a quiet, dark bedroom. Caffeine and alcohol, covered below, matter partly through their effect on sleep.

Match training intensity to recovery

Exercise raises cortisol for a short time, and the rise depends on intensity. In 12 trained men, 30 minutes of exercise at 40%, 60%, and 80% of maximal aerobic capacity changed blood cortisol by about +6%, +40%, and +83%. After accounting for fluid shifts and the time of day, the easy 40% session actually lowered cortisol [5].

This short-term rise is a normal response to training, not a problem to eliminate. The practical points are narrower:

• If cortisol is your concern, easy movement such as walking does not add to it.
• A hard session raises cortisol for a while afterward, so late-evening hard sessions work against the normal nighttime low.
• Rest before a cortisol test, because exercise shortly before sampling can raise the result [2].

Time caffeine and limit alcohol

Caffeine raises cortisol, and daily coffee drinkers are only partly tolerant to it. In a controlled trial of 96 adults, caffeine after five days of abstinence raised cortisol throughout the day. After five days of regular intake (300 to 600 mg a day), the morning dose no longer raised cortisol, but a second dose at 1 PM still did [6]. Caffeine also disrupts sleep for hours. In a home sleep study, 400 mg of caffeine taken 6 hours before bed still reduced sleep, which supports the common advice to stop caffeine at least six hours before bedtime [7].

Alcohol is linked to higher cortisol with regular heavy use. In the Whitehall II cohort of 3,670 adults, men’s salivary cortisol was about 3% higher for each weekly unit of alcohol, and heavy drinkers had a flatter daily cortisol curve [8]. This is an observational finding, so it shows an association rather than proof that cutting alcohol lowers cortisol. Heavy alcohol use is also a recognized cause of cortisol elevation that can mimic Cushing’s syndrome [1].

Use a stress practice, and set realistic expectations

Meditation and time outdoors have been measured against cortisol, with mixed results worth knowing.

• Meditation. A 2021 meta-analysis of randomized trials found a medium reduction in blood cortisol across 10 studies, but only in people with a physical illness. Across 21 studies that measured saliva, the effect was small and not statistically significant, with a borderline effect in people living through stressful circumstances [9].
• Time in nature. In an 8-week study of 36 city dwellers, spending at least 10 minutes in an outdoor place that felt like nature lowered salivary cortisol by about 21% per hour beyond its normal daily fall. The benefit per minute was greatest at 20 to 30 minutes [10].

The pattern across these studies is that stress practices help most for people who are under real strain, and the effect is modest. Choose the practice you can repeat most days.

What the evidence says about supplements for cortisol

Many “cortisol support” products combine several herbs and nutrients. The trials below tested single ingredients, so they say little about a blend. The evidence for each ingredient is uneven.

Ashwagandha has the most data, at low certainty. Several randomized trials in stressed adults reported lower serum or morning cortisol than placebo:

• 64 adults with chronic stress took 300 mg of a root extract twice daily for 60 days [11].
• 60 adults took 125 mg or 300 mg of a root extract twice daily for 8 weeks. Cortisol fell at both doses [12].
• 60 adults took 240 mg of a different extract once daily for 60 days [13].

A 2022 meta-analysis of 12 trials (1,002 participants) found lower stress and anxiety scores with ashwagandha, and rated the certainty of that evidence as low [14]. The trials were short and mostly small, and they used different extracts. The National Center for Complementary and Integrative Health reports rare cases of liver injury, notes that safety beyond about 3 months is unknown, and advises against ashwagandha during pregnancy and breastfeeding and for people with thyroid or autoimmune disorders [15].

Rhodiola rosea is supported by one trial. In 60 adults with stress-related fatigue, 576 mg a day of a standardized extract for 28 days reduced fatigue and changed the cortisol response to waking compared with placebo [16]. One trial is not enough to call this established.

Phosphatidylserine was tested around exercise, not daily stress. In 10 healthy men, 600 mg a day for 10 days blunted the cortisol rise during a short bout of hard cycling [17]. That result does not show it lowers everyday cortisol.

Magnesium has a plausible link but no direct proof. Low magnesium and stress appear to reinforce each other in the research, but that evidence comes mostly from laboratory and observational studies, not trials showing that magnesium supplements lower cortisol [18].

When high cortisol needs a clinician

Most cortisol concerns are stress-related. A small number are Cushing’s syndrome, which needs a medical workup. The Endocrine Society lists the features that best separate Cushing’s syndrome from ordinary weight gain and stress [1]:

• easy bruising
• a flushed, rounded face
• weakness in the thigh and upper-arm muscles, such as trouble rising from a chair
• wide, reddish-purple stretch marks, especially wider than 1 cm

Other signs raise concern when they appear together or get worse over time: rapid weight gain centered on the trunk, face, and upper back, new or hard-to-control high blood pressure, and rising blood sugar [1][3]. If you have several of these features, see a clinician for Cushing’s testing rather than working on lifestyle changes first.

Screening for Cushing’s syndrome does not use a single morning blood cortisol. The Endocrine Society guideline advises against using a random serum cortisol for screening. It recommends starting with one of three higher-accuracy tests: late-night salivary cortisol, 24-hour urinary free cortisol, or a low-dose dexamethasone suppression test. An abnormal result is followed by a second test and review by an endocrinologist [1]. Birth control pills with estrogen raise the protein that carries cortisol in the blood, which can falsely raise some results [1][2].

Which cortisol test answers which question

Each cortisol test answers a different question. Pick the one that matches yours and collect it at the right time.

If you retest, use the same test at the same time of day, under similar conditions. Cortisol varies so much across the day that results from different hours are not comparable [2]. Note the draw time, how you slept, and any recent illness, hard exercise, or steroid use (including creams and inhalers), because each can move the result [2].

If you have any of the red flags above, or a result outside its reference range, see a clinician for evaluation rather than repeating the morning test. Follow-up depends on the direction. The screening tests in the table are for suspected Cushing’s syndrome, when cortisol may be too high [1]. A low result points to different testing for low cortisol, covered in how to raise cortisol naturally.

A single morning value inside the reference range does not rule out Cushing’s syndrome, and a single high value does not diagnose it [1]. For how results compare with typical ranges, see normal cortisol levels by age and sex. To compare prices across providers, see the cortisol test cost guide.

The bottom line

Lowering cortisol is mostly about removing the things that keep it high. Sleep is the clearest lever. Caffeine timing and alcohol matter partly through their effect on sleep, and hard training raises cortisol for a while afterward. Stress practices help modestly, most for people under real strain. Ashwagandha has the most supplement data, but that evidence is low certainty and short term.

If you retest, use the same test at the same time of day. Treat bruising, a rounded and flushed face, muscle weakness, and wide purple stretch marks as signs for a medical workup, not a lifestyle plan.

Frequently asked questions

How long does it take to lower cortisol?

There is no fixed timeline. A night of lost sleep can raise cortisol by the next evening, so some effects are quick. The supplement and stress trials cited here ran for 8 weeks to 60 days and report group averages, not what one person can expect.

How can I lower cortisol quickly?

Short-term changes have some evidence. Twenty to thirty minutes outdoors in a natural setting lowered salivary cortisol in one 8-week study, and easy exercise such as walking did not raise it. Neither changes a long-term pattern on its own.

Does lowering cortisol help with belly fat?

Cushing’s syndrome causes weight gain centered on the trunk, face, and upper back. The studies on this page measured cortisol, not body fat, so they do not show that lowering everyday cortisol reduces belly fat. Rapid central weight gain with other red flags calls for Cushing’s testing.

Is it different for women?

The same levers apply. Estrogen-containing birth control and pregnancy raise the protein that carries cortisol in the blood, which raises total blood cortisol results. Mention either one when you are tested.

Can you lower cortisol too much?

Very low cortisol is a separate problem, and the changes on this page aim to restore a normal rhythm, not push cortisol below it. See how to raise cortisol naturally for the low end.

Related guides

• High cortisol symptoms: the signs of high cortisol and what causes it
• Dangers of high cortisol: what sustained high cortisol does to the body
• How to raise cortisol naturally: low cortisol, its causes, and how to address it
• Normal cortisol levels by age and sex
• Cortisol test cost: dated prices across providers

References

[1] Nieman LK, Biller BM, Findling JW, et al. The diagnosis of Cushing’s syndrome: an Endocrine Society Clinical Practice Guideline. J Clin Endocrinol Metab. 2008;93(5):1526-1540. PMID: 18334580

[2] MedlinePlus. Cortisol Test. Updated December 23, 2024. Read the test guide

[3] National Institute of Diabetes and Digestive and Kidney Diseases. Cushing’s Syndrome. Read the NIDDK overview

[4] Leproult R, Copinschi G, Buxton O, Van Cauter E. Sleep loss results in an elevation of cortisol levels the next evening. Sleep. 1997;20(10):865-870. PMID: 9415946

[5] Hill EE, Zack E, Battaglini C, et al. Exercise and circulating cortisol levels: the intensity threshold effect. J Endocrinol Invest. 2008;31(7):587-591. PMID: 18787373

[6] Lovallo WR, Whitsett TL, al’Absi M, et al. Caffeine stimulation of cortisol secretion across the waking hours in relation to caffeine intake levels. Psychosom Med. 2005;67(5):734-739. PMID: 16204431

[7] Drake C, Roehrs T, Shambroom J, Roth T. Caffeine effects on sleep taken 0, 3, or 6 hours before going to bed. J Clin Sleep Med. 2013;9(11):1195-1200. PMID: 24235903

[8] Badrick E, Bobak M, Britton A, et al. The relationship between alcohol consumption and cortisol secretion in an aging cohort. J Clin Endocrinol Metab. 2008;93(3):750-757. PMID: 18073316

[9] Koncz A, Demetrovics Z, Takacs ZK. Meditation interventions efficiently reduce cortisol levels of at-risk samples: a meta-analysis. Health Psychol Rev. 2021;15(1):56-84. PMID: 32635830

[10] Hunter MR, Gillespie BW, Chen SY. Urban nature experiences reduce stress in the context of daily life based on salivary biomarkers. Front Psychol. 2019;10:722. PMID: 31019479

[11] Chandrasekhar K, Kapoor J, Anishetty S. A prospective, randomized double-blind, placebo-controlled study of safety and efficacy of a high-concentration full-spectrum extract of ashwagandha root in reducing stress and anxiety in adults. Indian J Psychol Med. 2012;34(3):255-262. PMID: 23439798

[12] 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. PMID: 32021735

[13] Lopresti AL, Smith SJ, Malvi H, Kodgule R. An investigation into the stress-relieving and pharmacological actions of an ashwagandha (Withania somnifera) extract: a randomized, double-blind, placebo-controlled study. Medicine (Baltimore). 2019;98(37):e17186. PMID: 31517876

[14] Akhgarjand C, Asoudeh F, Bagheri A, et al. Does ashwagandha supplementation have a beneficial effect on the management of anxiety and stress? A systematic review and meta-analysis of randomized controlled trials. Phytother Res. 2022;36(11):4115-4124. PMID: 36017529

[15] National Center for Complementary and Integrative Health. Ashwagandha: Usefulness and Safety. Updated March 2023. Read the NCCIH page

[16] Olsson EM, von Schéele B, Panossian AG. A randomised, double-blind, placebo-controlled, parallel-group study of the standardised extract SHR-5 of the roots of Rhodiola rosea in the treatment of subjects with stress-related fatigue. Planta Med. 2009;75(2):105-112. PMID: 19016404

[17] Starks MA, Starks SL, Kingsley M, Purpura M, Jäger R. The effects of phosphatidylserine on endocrine response to moderate intensity exercise. J Int Soc Sports Nutr. 2008;5:11. PMID: 18662395

[18] Pickering G, Mazur A, Trousselard M, et al. Magnesium status and stress: the vicious circle concept revisited. Nutrients. 2020;12(12):3672. PMID: 33260549

Medical disclaimer

This guide is for educational purposes only and does not provide medical advice, diagnosis, or treatment.