Does Ashwagandha Help With Cortisol Levels?

Ashwagandha is one of the most studied herbs for stress relief, and the research consistently shows it can help lower cortisol levels in people under chronic stress. Cortisol is your body’s main stress hormone, and when it stays high for too long, it can disrupt sleep, increase anxiety, and contribute to weight gain. Clinical trials have found that taking ashwagandha extract daily for several weeks can significantly reduce measured cortisol levels compared to a placebo. That said, it is not a magic bullet, and it works best as part of a broader approach to managing stress.

What Is Cortisol and Why Does It Matter?

Cortisol is produced by your adrenal glands, which sit on top of your kidneys. It follows a daily rhythm. Levels are highest in the morning to help you wake up, and they drop gradually through the day so you can sleep at night.

This hormone does more than respond to stress. It helps regulate blood sugar, reduce inflammation, and manage blood pressure. Short bursts of cortisol are normal and healthy. They help you react quickly in a dangerous situation or focus during a demanding task.

Problems start when cortisol stays elevated for weeks or months. This can happen with ongoing work pressure, poor sleep, or constant worry. Chronically high cortisol is linked to anxiety, depression, digestive issues, and trouble sleeping. It can also make it harder to lose weight, especially around the midsection.

How Does Ashwagandha Affect Cortisol?

Ashwagandha is an adaptogen. That term gets thrown around a lot, but in clinical research it means the herb appears to help the body regulate its stress response. The active compounds in ashwagandha, called withanolides, are thought to influence the hypothalamic-pituitary-adrenal axis. That is the system that controls cortisol production.

Studies have measured actual cortisol levels in people taking ashwagandha. In several randomized controlled trials, participants who took ashwagandha extract showed a significant drop in blood cortisol levels after 60 days of use. Placebo groups did not show the same change. The reductions were most consistent in people who reported high stress levels at the start of the study.

One mechanism appears to be a reduction in the signaling that tells the adrenal glands to produce cortisol. This does not mean ashwagandha blocks cortisol entirely. It appears to dampen the overactive response that keeps cortisol high when stress is constant.

What Does the Research Actually Show?

The strongest evidence comes from randomized, double-blind, placebo-controlled trials. These are the gold standard in medical research. Several such trials have been conducted on ashwagandha for stress and cortisol.

One study published in the Journal of Clinical Psychiatry found that adults with chronic stress who took ashwagandha extract for 60 days had significantly lower cortisol levels than the placebo group. They also reported less anxiety and better sleep quality.

Another trial in the Indian Journal of Psychological Medicine involved 64 participants with a history of chronic stress. After 60 days, the ashwagandha group showed a reduction in cortisol of about 23 percent on average. The placebo group showed a smaller reduction of about 8 percent. Participants also scored lower on stress and anxiety questionnaires.

Some research suggests benefits appear even sooner. A study in Cureus found measurable reductions in both perceived stress and cortisol levels after just 30 days of supplementation. The effect was stronger at 60 and 90 days.

Not all studies show dramatic results. Some show modest changes, and a few show no significant difference. The overall picture, however, leans clearly in one direction. Most published trials report that ashwagandha reduces cortisol, particularly in people who are under stress.

How Long Does It Take to Work?

Ashwagandha is not a fast-acting drug. It does not work like a sedative or an anti-anxiety medication. The effects build gradually over several weeks.

Most clinical trials measure outcomes at 30, 60, and 90 days. The clearest reductions in cortisol are typically seen after 60 days of consistent daily use. Some people notice improved sleep or a calmer feeling within the first two weeks, but measurable changes in cortisol take longer.

Consistency matters more than dose timing. Taking ashwagandha daily, at roughly the same time, produces the most reliable results. Missing several days in a row can slow progress.

What Dose Is Used in Studies?

Clinical trials most commonly use a standardized extract of ashwagandha root. Standardization ensures the product contains a consistent amount of active withanolides. The most studied dose is 300 mg taken twice daily, for a total of 600 mg per day.

Some studies use a single daily dose of 500 to 600 mg. The extract is typically standardized to contain 5 percent withanolides. This standardization matters because raw ashwagandha powder contains much lower concentrations of active compounds.

If you buy ashwagandha, check the label for the withanolide percentage. A product that does not list this information may not contain enough active compounds to produce the effects seen in clinical trials.

Are There Side Effects or Risks?

Ashwagandha is generally well tolerated in healthy adults at the studied doses. The most commonly reported side effects are mild stomach upset, loose stools, and drowsiness. These usually resolve on their own or when the dose is lowered.

Some people should not take ashwagandha without talking to a doctor first. This includes people who are pregnant, trying to conceive, or breastfeeding. Ashwagandha can stimulate uterine contractions, and no safety data supports its use during pregnancy.

People with autoimmune conditions such as rheumatoid arthritis, lupus, or Hashimoto’s thyroiditis should also be cautious. Ashwagandha may stimulate immune activity, which could worsen these conditions. Thyroid hormone levels can also be affected, so anyone on thyroid medication should discuss it with their doctor.

Because ashwagandha can lower blood sugar and blood pressure, people taking medication for diabetes or hypertension should monitor their levels closely. Combining ashwagandha with sedatives or thyroid medications can also cause unintended interactions.

Does Ashwagandha Help With Cortisol Levels Compared to Other Methods?

Ashwagandha is not the only approach that lowers cortisol. Regular exercise, adequate sleep, and mindfulness-based stress reduction all have strong evidence behind them. The advantage of ashwagandha is that it requires no behavioral change. You take it daily and the effect builds in the background.

Exercise and sleep are arguably more powerful over the long term. But they are also harder to maintain consistently. Ashwagandha can be a useful addition, not a replacement, for these lifestyle factors.

Some research compares ashwagandha directly to conventional treatments. One study found it reduced stress and cortisol similarly to a common anti-anxiety medication, but with fewer side effects. This is promising but not conclusive. More head-to-head trials are needed before drawing firm conclusions.

Who Is Most Likely to Benefit?

People with elevated cortisol due to chronic stress appear to benefit the most. Studies consistently show larger reductions in cortisol among participants with high baseline stress scores. People with normal cortisol levels may not see much change, because there is less to correct.

Sleep quality also improves in most trials. Participants report falling asleep faster and waking less during the night. Better sleep alone can lower cortisol over time, so some of the benefit may be indirect.

People who are already sleeping well and managing stress effectively may not notice a dramatic difference. Ashwagandha appears to help the body recover from stress, not enhance performance in people who are already functioning well.