Taking a specific dose of L-citrulline for 10 days doesn’t make you bike harder, faster, or feel less tired—even though some people think it might help. Your heart, lungs, and muscles act the same as if you didn’t take it.
Claim Language
Language Strength
definitive
Uses definitive language (causes, prevents, cures)
The claim uses 'does not significantly alter' and 'suggesting no measurable physiological mechanism underlies', which are definitive in asserting the absence of effect and underlying mechanism, not leaving room for uncertainty or probability.
Context Details
Domain
exercise_science
Population
human
Subject
L-citrulline supplementation at 100 mg/kg/day for 10 days
Action
does not significantly alter
Target
cardiac output, oxygen uptake, blood pressure, lactate, or perceived exertion during high-intensity cycling in healthy young adults
Intervention Details
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.
Evidence from Studies
Supporting (2)
Scientists gave people a supplement called L-citrulline for 10 days and had them bike really hard. They checked their heart, lungs, blood, and how tired they felt — and found no difference compared to when they took a fake pill. So, the supplement didn’t help or change anything.
Scientists gave people a supplement called L-citrulline for 10 days and had them bike really hard. They checked their heart, lungs, blood, and how tired they felt — and found no difference compared to when they took a sugar pill. So, the supplement didn’t help or change anything.