L-arginine
Arginine · Performance
A nitric-oxide precursor that citrulline largely replaced, because most of an oral dose is broken down in the gut and liver.
What the evidence says
Modest blood pressure and erectile function signals at gram doses; for exercise performance, trials are mixed and citrulline outperforms it.
What studies used
Labels commonly list 3-6 g per serving.. Before training..
Reported from published studies and product labelling — a record of what was used in research, not a recommendation. What is right for you is a conversation with a clinician.
Watch out for
- Stomach upset at high doses
- Herpes outbreaks reported more often by some users
- Nitrates or blood pressure drugs
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