Norvaline
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A non-proteinogenic amino acid, meaning it is not used to build human proteins, structurally similar to valine. It is marketed in some nitric-oxide-boosting and pre-workout supplements.
Why it’s used
Taken based on animal research suggesting it may inhibit arginase, an enzyme that competes with nitric oxide production for the amino acid arginine.
What the evidence says
Evidence for norvaline comes almost entirely from animal and cell-based studies. There are no substantial published human clinical trials establishing effects of oral norvaline supplementation in people.
Where we looked
There was no paper to cite here, so this is the search instead — run it yourself and see what we saw.
- PubMed: 0 records · searched August 2026
"Norvaline"[Title/Abstract] AND ("dietary supplements"[MeSH] OR supplementation[Title/Abstract] OR supplement[Title/Abstract] OR supplements[Title/Abstract] OR "oral administration"[Title/Abstract]) AND (randomized controlled trial[pt] OR clinical trial[pt] OR meta-analysis[pt] OR systematic review[pt]) AND humans[MeSH] - PubMed: 568 records · searched August 2026
"Norvaline"[Title/Abstract]
This says what this database holds under these terms. It is not a finding that no research exists.
Context
No human dosing studies exist to describe.
Educational information, not medical or safety advice. Consult a professional for allergies or medical concerns.