Taking at least 6 grams of L-citrulline every day might lower your bottom blood pressure number by about 3 points, but taking less than that doesn’t seem to do anything noticeable.
Claim Language
Language Strength
definitive
Uses definitive language (causes, prevents, cures)
The claim uses 'significantly reduces' and 'show no significant effect', which are definitive language terms indicating a clear, measurable, and statistically confirmed effect, not a possibility or association.
Context Details
Domain
nutrition
Population
human
Subject
L-citrulline supplementation at doses of ≥6 g/day and ≤3–5 g/day in healthy adults
Action
reduces
Target
diastolic blood pressure by an average of 2.75 mmHg
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 (1)
l-Citrulline supplementation improves O2 uptake kinetics and high-intensity exercise performance in humans.
This study gave healthy men 6 grams of L-citrulline daily and found their blood pressure went down, which matches the claim that this dose helps lower blood pressure — but it didn’t test smaller doses, so it supports the idea that only higher doses work.