Evidence explainerAshwagandha
Cortisol Detox and "Cortisol Face": What Is Real, What Is Marketing, and When to See a Doctor
Cortisol is not a toxin, and a puffy face is rarely a cortisol disease. One ingredient in cortisol blends, ashwagandha, does lower cortisol modestly in small trials. The real medical concern, Cushing's syndrome, has specific warning signs worth knowing.
Key takeaways
- Facial fullness is listed by the Endocrine Society as a common, poorly discriminating feature; the signs that best point to Cushing's syndrome are easy bruising, facial plethora, proximal muscle weakness and reddish-purple stretch marks wider than 1 cm [1].
- Endogenous Cushing's syndrome is rare, about 2 to 3 new cases per million people a year in European studies; the most common cause of cortisol excess is prescribed steroid medicine [1].
- A 2025 meta-analysis of 7 trials found ashwagandha lowered cortisol by about 1.16 µg/dL, but perceived stress did not change significantly [6].
- A systematic review of 58 studies found no substantiation that "adrenal fatigue" is a real medical condition [3].
- We found no trial of a cortisol detox blend, and none of the cortisol trials of ashwagandha measured face shape.
Safety at a glance
From our Ashwagandha monograph. Published interactions and cautions only, each with its source.
Interactions
- Thyroid hormone medicines. ODS: ashwagandha might interact with thyroid hormone medicines; trials and case reports describe changes in TSH, T3 and T4, including three cases of thyrotoxicosis.[1]
- Antidiabetes medicines. Listed by ODS as a possible interaction.[1]
- Blood pressure medicines (antihypertensives). Listed by ODS as a possible interaction.[1]
- Immunosuppressants. Listed by ODS as a possible interaction.[1]
Who should be careful
- Pregnancy and breastfeeding. Some experts advise against use in pregnancy. France's food-safety agency (ANSES, 2024) recommends against use while pregnant or breastfeeding, and Denmark banned ashwagandha in 2023; the American Herbal Pharmacopoeia disputes the evidence for harm in pregnancy.[1]
- Liver. Rare liver injury has been reported, typically cholestatic with jaundice and itching 2–12 weeks after starting; in a 5-case series, liver tests normalized within 1–5 months after stopping. Some reported cases involved pre-existing liver disease, so people with liver conditions should talk to their clinician first.[10][1]
- Thyroid conditions. An 8-week trial at 600 mg/day changed TSH, T3 and T4 compared with placebo, and thyrotoxicosis has been reported. Anyone with a thyroid condition or on thyroid medicine should speak with their clinician first.[11][1]
- Hormone-sensitive prostate cancer. Ashwagandha may raise testosterone, and experts cited by ODS say it might not be safe for men with hormone-sensitive prostate cancer.[1][7]
The evidence, graded
Pulled from our monograph evidence tables. Grades follow our evidence-grading policy.
- Grade CImprovedMorning cortisolGreater reductions in morning cortisol and DHEA-S than placebo; Hamilton Anxiety score fell significantly, DASS-21 near-significantly. No adverse events.
- Grade BImprovedPerceived stressStress (SMD -1.75) and anxiety (SMD -1.55) fell versus placebo. Heterogeneity was very high (I² 83–94%) and certainty of evidence was low.
The trend: a round face blamed on stress hormones
"Cortisol face" videos attribute facial puffiness to chronically high stress hormones and sell "cortisol detox" drinks and capsules to bring it down. Cortisol is an essential hormone, not a toxin to be flushed out, and the body regulates it tightly. The medical condition of true cortisol excess, Cushing's syndrome, does include facial changes, but the Endocrine Society lists facial fullness among features that are common in the general population and poorly discriminating [1].
A German registry shows how often the hunch is wrong: of 377 people referred for suspected Cushing's syndrome, it was confirmed in 93 [2]. Obesity as the reason for referral was more common among people in whom it was ruled out (30% vs 4%), while muscle weakness (myopathy) and having multiple symptoms were more common in confirmed cases [2].
When to see a doctor: Cushing's red flags
The Endocrine Society guideline recommends testing people with multiple and progressive features, especially those that best discriminate Cushing's syndrome, and people with unusual features for their age such as osteoporosis or high blood pressure [1]. The features that best discriminate, though none is highly sensitive, are [1]:
Check the medicine cabinet first
The most common cause of cortisol excess is prescribed corticosteroids, and the guideline recommends a thorough drug history before any testing, covering oral, inhaled, topical, injected and rectal steroids [1]. It specifically warns that steroid ingredients in skin creams, including bleaching creams, herbal medicines and "tonics", may be overlooked [1]. Any change to a prescribed steroid belongs with the prescriber.
Why a single cortisol test is not the answer
Cortisol levels change through the day, and the guideline recommends against a random serum cortisol as a test for Cushing's syndrome [1]. Recommended first tests are a 24-hour urine free cortisol, late-night salivary cortisol measured twice, or an overnight dexamethasone suppression test, with abnormal results confirmed by a second test and an endocrinologist [1]. Concordant normal results generally end the evaluation, while people whose features keep accumulating may be retested [1].
What the cortisol supplements can and cannot do
Ashwagandha is the one common ingredient with cortisol data. In 60 stressed adults, 240 mg a day of a standardized extract for 60 days lowered morning cortisol and anxiety scores more than placebo [4]. In 64 adults with chronic stress, 300 mg twice a day for 60 days lowered serum cortisol and stress scores [5]. A 2025 meta-analysis of 7 trials found an average cortisol reduction of 1.16 µg/dL, but no significant change in perceived stress across 6 trials [6]. We grade the cortisol finding C.
None of these trials measured facial appearance, and lowering cortisol that is already normal has no proven benefit for face shape [4][5][6]. Ashwagandha has rare reports of liver injury: in a 5-patient case series, jaundice and itching began 2 to 12 weeks after starting, and liver tests normalized within 1 to 5 months in the 4 patients followed [7]. Because blends are untested as "detox" products and ashwagandha carries this safety signal, we show no product here. For the full picture see ashwagandha for stress and sleep and ashwagandha side effects: liver and thyroid.
A related myth: adrenal fatigue
"Adrenal fatigue" is often sold alongside cortisol products. A systematic review screened 3,470 articles, included 58 studies, found conflicting results from the cortisol tests used, and concluded there is no substantiation that adrenal fatigue is an actual medical condition [3]. Persistent tiredness has many real, testable causes that a clinician can work through.
Quick answers
Is cortisol face real?
A round, full face can be part of Cushing's syndrome, but the Endocrine Society lists facial fullness as common and poorly discriminating; easy bruising, facial plethora, muscle weakness and wide purple stretch marks are more telling [1].
Do cortisol detox supplements work?
No trial has tested a cortisol detox blend. Ashwagandha, a common ingredient, lowered cortisol by about 1.16 µg/dL in a 7-trial meta-analysis [6].
Can I test my cortisol at home?
The guideline recommends against a single random cortisol test; validated tests include two late-night salivary samples interpreted by a clinician [1].
Is adrenal fatigue real?
A systematic review of 58 studies found no substantiation that adrenal fatigue is an actual medical condition [3].
Keep reading
Full monographs
Related articles
- Ashwagandha for Stress and Sleep: What the Trials Found, and Why the Results Vary So Much
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- Ashwagandha Side Effects: The Liver, Thyroid and Pregnancy Warnings Behind Denmark’s Ban
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Where to buy Ashwagandha
Products from brands we partner with that contain Ashwagandha. Listing a product is not a claim that it works; check the amount per serving against the doses studied above, and the label for other ingredients.
- Botanic ChoicePaid linkBotanic Choice Ashwagandha Extract, 90 capsules1 vege capsule: 450 mg ashwagandha root extract (1.5% withanolides, 6.75 mg); label directions 1 capsule 1 to 3 times daily with a mealOne-time price $24.00Shop at Botanic Choice (opens in new tab)Price and label checked 2026-10-12 on the brand’s site.
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References
- [1]The diagnosis of Cushing's syndrome: an Endocrine Society Clinical Practice Guideline. Journal of Clinical Endocrinology & Metabolism, 2008.
- [2]Whom Should We Screen for Cushing Syndrome? The Endocrine Society Practice Guideline Recommendations 2008 Revisited. Journal of Clinical Endocrinology & Metabolism, 2022.
- [3]Adrenal fatigue does not exist: a systematic review. BMC Endocrine Disorders, 2016.
- [4]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.
- [5]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 Journal of Psychological Medicine, 2012.
- [6]Dual impact of Ashwagandha: Significant cortisol reduction but no effects on perceived stress - A systematic review and meta-analysis. Nutrition and Health, 2025.
- [7]Ashwagandha-induced liver injury: A case series from Iceland and the US Drug-Induced Liver Injury Network. Liver International, 2020.