Does Ashwagandha Actually Lower Cortisol or Just Make You Feel Less Stressed?

Research suggests ashwagandha does lower cortisol.

A 2025 systematic review and meta-analysis pooled data from multiple clinical trials and found a clear drop in cortisol levels in people taking ashwagandha, compared to placebo.^[11]

But the same analysis found something surprising.

It did not find a matching drop in perceived stress scores.^[11] In plain words, cortisol went down on lab tests, but people did not report feeling less stressed.

This is a real gap between what happens inside the body and what a person notices day to day. It matters because most people take ashwagandha hoping to feel calmer, not just to change a hormone reading.

Cortisol is a hormone made by the adrenal glands. It rises when the body senses a physical or mental stressor, and it helps regulate blood sugar, blood pressure, and inflammation.

Cortisol naturally follows a daily rhythm. It is highest in the morning and lowest at night.

Chronic high cortisol has been linked to poor sleep, weight gain, and mood problems, which is why lowering it sounds appealing.

Cortisol is usually measured in blood, saliva, or urine in these studies. Perceived stress, on the other hand, is measured with questionnaires where people rate their own feelings.

These are two very different types of measurement, and that difference may explain the mismatch seen with ashwagandha.^[11]

There are a few possible explanations for this disconnect, though none are confirmed by the current evidence.

• Cortisol is an objective biomarker, while perceived stress is subjective and shaped by mood, expectations, and daily life circumstances.
• A small hormone shift may not be large enough for a person to consciously feel different.
• Placebo effects can be strong in stress questionnaires, making it harder to detect a true drug effect on perceived stress.
• Study designs, doses, and durations vary widely across ashwagandha trials, which adds noise to the pooled results.^[11]

It is also possible that lower cortisol brings benefits that show up elsewhere, like in sleep quality or blood pressure, rather than in a stress questionnaire.

That question has not been directly settled in the available research.

Ashwagandha is not the only compound studied for stress. Some others show a different pattern, where perceived stress and performance measures move together more clearly.

• L-theanine has been studied for stress and cognitive performance, including in a randomized controlled trial using a virtual reality active shooter drill, where it was paired with L-tyrosine.^[17]
• A separate 28-day trial of L-theanine in adults with moderate stress looked at safety and efficacy markers over that period.^[16]
• Compounds like licorice-derived glycyrrhizin affect cortisol-related pathways in the body, such as the enzyme 11beta hydroxysteroid dehydrogenase type 2, which controls how cortisol is broken down.^[12][19]

These comparisons show that stress-related supplements can act through very different mechanisms. Some target the hormone directly, and some target how the brain processes stress signals.

Ashwagandha's effect appears concentrated on the hormone side, based on current data.^[11]

If the goal is to lower a measurable cortisol level, the current meta-analysis evidence points in that direction.^[11] If the goal is to feel calmer right away, the evidence so far does not support a guaranteed change in perceived stress.

This is not medical advice, and individual responses can vary quite a bit. Ashwagandha research is still evolving, and dose, form, and study length differ across trials included in the analysis.^[11]

Anyone with a health condition, or anyone taking medications for thyroid, blood pressure, or mood disorders, should talk with a doctor before starting any new supplement, since cortisol and hormone pathways can interact with existing treatments.