Evidence map›Paper›PMID 34254920›Full record

ReviewCurrent neuropharmacology2021

Effects of

Alex B Speers, Kadine A Cabey, Amala Soumyanath, Kirsten M Wright

Open access · greenAbstract readReview
In one paragraph

Review in Current neuropharmacology, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 96 papers, 5 of them syntheses that pooled it.

0numbers the graph read from it
0cells of the map it votes in
96citing papers in PubMed, 5 pooled it
31.3field-weighted citation impact, top 1% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

96 citing papers in PubMed, 5 syntheses or guidelines pooled it, 186 citations in OpenAlex.

  1. Adjunctive Ashwagandha (Nutrients · 2026
    Pooled it
  2. Pooled it
  3. Effects ofNutrients · 2026
    Pooled it
  4. Effects ofNutrients · 2023
    Pooled it
  5. Pooled it
  6. Trial
  7. Trial
  8. Trial
  9. Efficacy and safety of Ashwagandha (Frontiers in global women's health · 2026
    Trial
  10. Trial
  11. Trial
  12. Trial
  13. Effects ofNutrients · 2024
    Trial
  14. Exploring the efficacy and safety of a novel standardized ashwagandha (Journal of psychopharmacology (Oxford, England) · 2023
    Trial
  15. Article
  16. Article
  17. Social Media and Supplements for Menopausal Symptoms: A Content Analysis.BJOG : an international journal of obstetrics and gynaecology · 2026
    Observational
  18. Review
  19. Review
  20. Review

36 more citing papers are in PubMed but not listed here.

4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

4 authors at 2 institutions in 1 country.

Alex B SpeersBENFRA Botanical Dietary Supplements Research Center, Oregon Health and Science University, Portland, Oregon, United States.
Kadine A CabeyHelfgott Research Institute, National University of Natural Medicine, Portland, Oregon, United States.
Amala SoumyanathBENFRA Botanical Dietary Supplements Research Center, Oregon Health and Science University, Portland, Oregon, United States.
Kirsten M WrightBENFRA Botanical Dietary Supplements Research Center, Oregon Health and Science University, Portland, Oregon, United States.
Oregon Health & Science University · USNational University of Natural Medicine · US

Funding

Oregon Clinical and Translational Research Institute KL2 SupplementKL2TR002370 · NCATS · OREGON HEALTH & SCIENCE UNIVERSITY · PI Catherine Lee Hough · 2017 to 2026
$10.1M
CAM Research Training in Neuroscience &StressT32AT002688 · NCCIH · OREGON HEALTH & SCIENCE UNIVERSITY · PI OKEN, BARRY S, SOUMYANATH, AMALA · 2005 to 2025
$7.2M
Mechanisms underlying the cognitive effects of Centella asiatica water extract and constituent compounds in the 5xFAD mouse model of Alzheimer's DiseaseU19AT010829 · NCCIH · OREGON HEALTH & SCIENCE UNIVERSITY · PI MAIER, CLAUDIA S · 2020 to 2024
$6.1M
Biological signatures of the cognitive effects of Centella asiaticaR61AT009628 · NCCIH · OREGON HEALTH & SCIENCE UNIVERSITY · PI QUINN, JOSEPH F, SOUMYANATH, AMALA · 2017 to 2019
$522k
NCATS NIH HHS KL2 TR002370NCCIH NIH HHS R61 AT009628NCCIH NIH HHS T32 AT002688NCCIH NIH HHS U19 AT010829NIH HHS T32AT002688, U19AT010829, KL2TR002370, R61AT009628
6 · The paper itself

Abstract

backgroundWithania somnifera (WS), also known as Ashwagandha, is commonly used in Ayurveda and other traditional medicine systems. WS has seen an increase in worldwide usage due to its reputation as an adaptogen. This popularity has elicited increased scientific study of its biological effects, including a potential application for neuropsychiatric and neurodegenerative disorders.

objectiveThis review aims to provide a comprehensive summary of preclinical and clinical studies examining the neuropsychiatric effects of WS, specifically its application in stress, anxiety, depression, and insomnia.

methodsReports of human trials and animal studies of WS were collected primarily from the PubMed, Scopus, and Google Scholar databases.

resultsWS root and leaf extracts exhibited noteworthy anti-stress and anti-anxiety activity in animal and human studies. WS also improved symptoms of depression and insomnia, though fewer studies investigated these applications. WS may alleviate these conditions predominantly through modulation of the hypothalamic-pituitary-adrenal and sympathetic-adrenal-medullary axes, as well as through GABAergic and serotonergic pathways. While some studies link specific withanolide components to its neuropsychiatric benefits, there is evidence for the presence of additional, as yet unidentified, active compounds in WS.

conclusionWhile benefits were seen in the reviewed studies, significant variability in the WS extracts examined prevents a consensus on the optimum WS preparation or dosage for treating neuropsychiatric conditions. WS generally appears safe for human use; however, it will be important to investigate potential herb-drug interactions involving WS if used alongside pharmaceutical interventions. Further elucidation of active compounds of WS is also needed.

Indexed as

Sleep Initiation and Maintenance DisordersWithaniaAnimalsAnxietyDepressionHumansPlant ExtractsAshwagandhaPlant ExtractsAnxietyAshwagandhadepressioninsomniastressWithania somnifera.

Identifiers

PMID34254920
PMCPMC8762185
OpenAlexW3182049783

What OpenQuestion holds

Textmetadata
LicenceCC BY-NC
Read underepoch 390

Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.