Ashwagandha or melatonin for sleep? A 2026 trial reported improvements with both, and the largest observed changes with their combination. The results apply to specific doses and a specific ashwagandha extract; they do not establish that any ashwagandha product works as well as melatonin.
Two supplement names can hide a lot of variation. The useful question is what researchers actually gave people, how they measured sleep, and how much the comparison group improved.
The eight-week comparison
The randomized, placebo-controlled trial in Clocks & Sleep assigned 200 adults with sleep disturbances to four groups: KSM-66 ashwagandha root extract at 300 mg twice daily, melatonin at 3 mg nightly, both, or placebo. The reported analysis included 188 completers.
| Group | Reduction from baseline |
|---|---|
| Ashwagandha | 14.6 minutes |
| Melatonin | 16.4 minutes |
| Combination | 20.9 minutes |
| Placebo | 7.2 minutes |
Sleep was assessed with wrist actigraphy and questionnaires. The extract supplier provided KSM-66; the authors reported no external funding or conflicts of interest.
Read the placebo column first
The ashwagandha group’s 14.6-minute improvement includes change that also occurred in the control group. Subtracting the placebo change gives an additional 7.4 minutes. That simple calculation is more informative than presenting the entire before-and-after change as the supplement’s effect.
Likewise, similar-looking numbers do not establish clinical equivalence. An equivalence trial needs a prespecified margin and an analysis designed to test it. “Both groups improved” is a narrower, more defensible interpretation.
Why the extract matters more than the largest number
Ashwagandha labels can report actual extract weight, a root-equivalent amount, and a withanolide concentration. These describe different things. A large root-equivalent number cannot be compared directly with milligrams of the standardized extract used in a trial.
For example, XWERKS Ashwa’s current Supplement Facts list 1,500 mg root equivalent from 50 mg of a 30:1 extract per two-gummy serving, standardized to 3% withanolides. This is a different preparation from the trial’s 600 mg daily KSM-66 regimen. The study did not test Ashwa gummies, and its results do not justify increasing gummy servings to imitate the research.
Our guide to ashwagandha extracts explains how to compare these labels without mixing up root equivalents and extract amounts.
How much confidence should you place in it?
This is more substantial than a tiny pilot, but eight weeks is still short. An analysis of completers can differ from an analysis of everyone randomized, and a wrist movement monitor is not the same as a laboratory sleep study.
The NIH Office of Dietary Supplements describes the wider sleep evidence as limited but promising, with generally small benefits. It also notes that long-term safety is uncertain. Ashwagandha can cause drowsiness or stomach upset, affect thyroid function, and interact with medications; rare liver injury has been reported. Avoid it during pregnancy and discuss use with a clinician if you take medicines or have a relevant health condition.
Should you combine ashwagandha and melatonin?
This paper is a reason to study the combination further, not a universal bedtime recipe. Your sleep pattern, medication use, and reason for taking a supplement matter. Our ashwagandha timing guide can help organize the questions to consider.
