Taking a specific ashwagandha supplement called KSM-66 at 300-600mg every day for about 2 months can change how strong you are, how long you can exercise, and your stress hormone levels.
Evidence from Studies
Supporting (2)
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Examining the effect of Withania somnifera supplementation on muscle strength and recovery: a randomized controlled trial
This study tested ashwagandha (600mg daily for 8 weeks) and found it improved muscle strength in people doing resistance training. This matches part of the claim about dosage and duration, but the study didn't test cortisol or endurance, and didn't specify using KSM-66 extract. The study supports the claim partially but doesn't cover all the conditions mentioned.
This study tested ashwagandha at 600mg daily for 8 weeks and found it improved strength and endurance in people doing resistance training. This matches most of the claim's conditions (dosage within 300-600mg range, 8 weeks duration), though it doesn't specifically mention KSM-66 extract or measure cortisol as the claim states.
Contradicting (0)
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Gold Standard Evidence Needed
According to GRADE and EBM methodology, here is what ideal scientific evidence would look like to definitively prove or disprove this specific claim, ordered from strongest to weakest evidence.