causal
Analysis v1
Strong Support
Taking a specific amino acid supplement (L-citrulline) twice a day for a week doesn’t make blood vessels open up better in healthy people with a certain chemical imbalance, even though it raises some markers linked to blood vessel health—so short-term use probably won’t help their circulation.
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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 a supplement called L-citrulline twice a day for a week and found it boosted certain body signals related to blood vessel health, but didn’t actually make their blood vessels open up better — just like 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.