The Claim
Acute ingestion of citrulline malate increases the serum arginine-to-ADMA and arginine-to-SDMA ratios in healthy young males, despite no measurable change in flow-mediated dilation.
What the research says
Supports is higher
Support is ahead, but a single strong opposing study can change this.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
When healthy young men take citrulline malate, their blood shows higher ratios of arginine to two molecules that inhibit nitric oxide production, even though blood vessel function does not change measurably.
See the scientific wording
Acute citrulline malate ingestion increases the serum arginine-to-ADMA and arginine-to-SDMA ratios in healthy young males, indicating improved substrate availability relative to endogenous nitric oxide synthase inhibitors, despite no measurable change in FMD.
When citrulline malate is swallowed, it breaks down into citrulline, which the kidneys turn into arginine. This raises arginine levels in the blood while leaving the levels of two blocking molecules, ADMA and SDMA, unchanged. The higher ratio of arginine to these blockers gives the enzyme that makes nitric oxide more of its raw material, even though the blood vessels do not widen as a result.
What the research says
1 studyWhen healthy young men took citrulline malate, their blood showed higher levels of arginine compared to two molecules that block nitric oxide production—even though their blood vessels didn't widen. This matches the claim exactly.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.