Pump / nitric oxide evidence brief
L-arginine is an amino acid used to make nitric oxide. It is commonly promoted for pump, blood flow, endurance, and erectile-function-adjacent claims.
Some meta-analytic signal exists, but oral arginine is not a top-tier nitric-oxide strategy for performance or pump claims.
Performance meta-analysis suggests possible effects, but oral arginine is less reliable than better-supported nitrate strategies.
Protocols vary; gastrointestinal tolerance can limit higher intakes.
Citrulline and nitrate usually deserve review before arginine for performance use cases.
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The score reflects evidence that the supplement does its stated job. Some jobs are direct, such as strength, endurance, or recovery; others are indirect, such as sleep, mood, appetite, or health support. A real effect can still receive a cautious practical rating when dose, safety, product quality, or audience fit remain uncertain.
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