Research

Hormonal

Oral L-arginine supplementation (21g/day for 4 weeks) improves endothelium-dependent dilation in young adults with hypercholesterolemia.

If you are a young adult with high cholesterol, taking 21 grams of L-arginine daily for a month may help improve your blood vessel flexibility (endothelial function). This benefit is specific to those with elevated cholesterol; it does not lower cholesterol itself. Be aware that high doses can cause stomach upset, so monitor your tolerance.

GoodSupportsHIGH confidence
Dietary supplementation with L-arginine significantly improves EDD in hypercholesterolemic young adults, and this may impact favorably on the atherogenic process.
P Clarkson et al. · Journal of Clinical Investigation · 1996

Why this rating

Randomized, double-blind, placebo-controlled crossover design with a relatively small sample size (n=27).

Source

Oral L-arginine improves endothelium-dependent dilation in hypercholesterolemic young adults.

P Clarkson et al. · Journal of Clinical Investigation · 1996

DOI 10.1172/jci118632

crossover · n=27Cited 415×
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DOI resolved against Crossref · corpus check 2026-06-10

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