The Claim

Ashwagandha root extract administered at 600 mg daily in conjunction with eight weeks of resistance training produces statistically significant increases in muscle girth measurements, specifically mid-arm circumference (effect size 0.526, p=0.002) and chest circumference (effect size 0.596, p=001), compared to placebo.

Source: Effects of Ashwagandha ( Withania somnifera) standardized root extract on physical endurance and VO 2max in healthy adults performing resistance training: An eight-week, prospective, randomized, double-blind, placebo-controlled study

What the research says

Supports is higher

Support is ahead, but a single strong opposing study can change this.

Supports
61score
Challenges
0score

These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.

Cause and effect
1 study reviewed
In plain English

Taking ashwagandha root extract (600mg daily) while doing weight training for 8 weeks makes your arms and chest grow bigger than just doing weight training with a fake pill (placebo).

See the scientific wording

Ashwagandha root extract (600mg/day) significantly increases muscle girth measurements including mid-arm circumference (effect size 0.526, p=0.002) and chest circumference (effect size 0.596, p=0.001) after eight weeks of resistance training compared to placebo

What the research says

1 study

  1. Study: Effects of Ashwagandha ( Withania somnifera) standardized root extract on physical endurance and VO 2max in healthy adults performing resistance training: An eight-week, prospective, randomized, double-blind, placebo-controlled study

    This study tested exactly what the claim says - taking 600mg of Ashwagandha root extract daily while doing resistance training for 8 weeks. The researchers found that people taking Ashwagandha got bigger arm and chest muscles compared to those taking placebo, which supports the claim.

Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies

Fit Body Science verdict — we translate health claims into clear verdicts backed by peer-reviewed research.

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