Ashwagandha Science ashwagandhascience.org

Evidence-backed FAQ

Does ashwagandha improve memory and focus?

Direct answer

The evidence is mixed and population-specific. A small mild-cognitive-impairment trial reported improvements, while most cognitive tests in a healthy-young-adult trial did not differ from placebo.[1], [2]

Important limitations

Based on a single small pilot trial of 50 adults with mild cognitive impairment using 300 mg twice daily for 8 weeks; the findings need confirmation in larger trials and may not apply to healthy adults. Based on one trial with 59 participants analyzed, using 225 mg per day of a liposomal root-and-leaf extract for 30 days; improvements within a treatment group do not establish superiority over placebo. The selected positive comparisons need replication and do not establish a general memory, attention, or mood benefit.[1], [2]

What the evidence shows

Based on a single small pilot trial of 50 adults with mild cognitive impairment using 300 mg twice daily for 8 weeks; the findings need confirmation in larger trials and may not apply to healthy adults. Based on one trial with 59 participants analyzed, using 225 mg per day of a liposomal root-and-leaf extract for 30 days; improvements within a treatment group do not establish superiority over placebo. The selected positive comparisons need replication and do not establish a general memory, attention, or mood benefit.[1], [2]

What the cited evidence shows

In a small randomized, double-blind, placebo-controlled trial of adults with mild cognitive impairment, ashwagandha root extract significantly improved measures of immediate and general memory, attention, and information-processing speed compared with placebo. Based on a single small pilot trial of 50 adults with mild cognitive impairment using 300 mg twice daily for 8 weeks; the findings need confirmation in larger trials and may not apply to healthy adults.[1]

In a randomized, double-blind, placebo-controlled trial of healthy young adults, most cognitive tests and overall mood showed no significant differences in change over time between liposomal ashwagandha and placebo. Selected comparisons favored ashwagandha for picture-recognition reaction time after the first dose and fatigue before dosing on day 30. Based on one trial with 59 participants analyzed, using 225 mg per day of a liposomal root-and-leaf extract for 30 days; improvements within a treatment group do not establish superiority over placebo. The selected positive comparisons need replication and do not establish a general memory, attention, or mood benefit.[2]

Safety belongs in the decision

NIH guidance describes short-term tolerability observations for ashwagandha over about three months, while safety over longer periods remains unknown. Short studies cannot establish safety for every person, preparation, or duration of use.[3]

Read the supporting evidence summaries

The linked research pages provide study populations, formulations, doses, outcomes, and limitations in greater detail.

Related questions

References

  1. Efficacy and Safety of Ashwagandha (Withania somnifera (L.) Dunal) Root Extract in Improving Memory and Cognitive Functions.. Journal of dietary supplements. 2017. Randomized controlled trial View source →
  2. Acute and Repeated Ashwagandha Supplementation Improves Markers of Cognitive Function and Mood.. Nutrients. 2024. Randomized controlled trial View source →
  3. Ashwagandha: Usefulness and Safety. NIH National Center for Complementary and Integrative Health. Retrieved 2026-09-30. Government health fact sheet View source →