BODYDATA
Research
Study type: Randomized controlled trialConfidence: Moderate

Examining the effect of Withania somnifera supplementation on muscle strength and recovery: a randomized controlled trial

Wankhede SLangade DJoshi KSinha SRBhattacharyya S

Year2015
Sample sizen=57
JournalJournal of the International Society of Sports Nutrition
AuthorsWankhede SLangade DJoshi KSinha SRBhattacharyya S

Evidence is still building up

Summary

Summary

An RCT in 57 healthy resistance-training men taking ashwagandha root extract (KSM-66) 600 mg/day for 8 weeks. Compared with placebo, bench press and leg extension strength improved significantly, alongside reduced serum cortisol, increased lean mass, and lower body fat. Limited by its short 8-week duration and a possible conflict of interest with the manufacturer.

Source (read the original)

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DOI: 10.1186/s12970-015-0104-9

Key Findings

Key findings

  • 1

    Bench press and leg extension strength significantly improved vs placebo

  • 2

    Serum cortisol levels significantly decreased vs placebo

  • 3

    Lean body mass increased and body fat percentage decreased

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Ashwagandha

Reduction in cortisol (significant decrease confirmed in studies)

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Last checked: 2026-06-23