How to Lower Cortisol Levels with Supplements | Evidence Checked

For the full breakdown, see our best Cortisol Supplements for Weight Loss guide.

High stress keeps your cortisol elevated, and stubbornly high levels are linked to sleep problems, weight gain, and fatigue. That makes the evidence on how to lower cortisol levels with supplements worth weighing carefully, because the honest picture is mixed: a few ingredients have solid studies behind them, while most promises on store shelves are marketing.

Ashwagandha Is The Best Studied Option

Ashwagandha has the strongest research support of any supplement for stress and cortisol, but the evidence is not universal. Some preparations may help with stress and insomnia; for anxiety the data is unclear, and effects vary widely between products and people.

When it is used, the guidance is short-term only — typically a limit of about 3 months, with longer use not well studied. A common clinical limit is no more than 500 mg twice daily unless a clinician directs otherwise.

Warnings matter as much as the benefits. Ashwagandha can cause drowsiness, stomach upset, and diarrhea; rare liver injury has been reported. Avoid it in pregnancy and breastfeeding, with autoimmune disease or thyroid disorders, and before surgery. It can interact with diabetes drugs, blood pressure medications, immunosuppressants, sedatives, anticonvulsants, and thyroid hormone — so anyone on those should review it with a doctor first.

What The Evidence Says About Other Supplements

The 2024 meta-analysis behind the probiotic finding pooled 46 randomized trials and found a standardized mean difference of −0.45 for cortisol versus control, but certainty was low and heterogeneity high — meaning results varied a lot from person to person. Both findings come from clinical research, not FDA-recognized claims, per the National Center for Complementary and Integrative Health’s framing.

Supplements That Are Not Worth Buying (Or Are Not Supplements)

Two things you will hear about do not belong in a supplement routine. Mifepristone and hydrocortisone can lower cortisol, but they are prescription drugs used in specific medical situations involving cortisol or steroid physiology — not products for healthy people. No supplement “adaptogen” reliably lowers cortisol for everyone, and any product promising that is overstating its evidence.

FAQs

How long does it take for ashwagandha to lower cortisol?

Studies typically measure effects over 4 to 12 weeks of daily use, so a meaningful change usually takes at least a few weeks. Because long-term safety beyond roughly 3 to 6 months is not well studied, the common advice is short-term use followed by a reassessment.

Can I take ashwagandha with my current medications?

Not without a review. Ashwagandha can interact with diabetes drugs, blood pressure medications, immunosuppressants, sedatives, anticonvulsants, and thyroid hormone. Anyone with autoimmune disease, a thyroid disorder, or pregnancy should avoid it entirely. Talk to a pharmacist or doctor before combining.

What actually lowers cortisol if supplements don’t work?

Sleep, daily movement, and cutting chronic overtraining are the most reliable levers. Ashwagandha and the others are an adjunct, not a replacement — and if stress is severe or persistent, a clinician should be involved rather than self-supplementing.

The dependable summary is short: ashwagandha has the most evidence; probiotics, vitamin C, DHEA, and tangeretin have supportive but limited data; long-term use is unresearched; and anyone on medication, pregnant, or with an autoimmune or thyroid condition needs medical review before starting.