causal
Analysis v1
Strong Support
Taking L-citrulline or L-arginine supplements for a week didn’t make blood vessels relax better in healthy people, even though their bodies showed more of a chemical linked to blood vessel health. So, boosting that chemical briefly doesn’t seem to help blood flow in the short term.
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0
Evidence from Studies
Supporting (1)
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Community contributions welcome
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Pharmacokinetic and pharmacodynamic properties of oral L-citrulline and L-arginine: impact on nitric oxide metabolism.
Randomized Controlled Trial
Human
2008 JanThe study gave people L-citrulline or L-arginine pills for a week and found that even though their bodies made more nitric oxide, their blood vessels didn’t get better at relaxing — which is exactly what the claim says.
Contradicting (0)
0
Community contributions welcome
No contradicting evidence found
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.