Amino acid derivative
Ornithine
Ornithine is an amino acid that the body makes from arginine. It is part of the urea cycle and is not used to build proteins.
Also listed as L-Ornithine
What it is studied for
The strongest rated effects first. Bars show the size of the effect, the letter grades the evidence, and each rating lists the studies behind it.
All 7 rated effectsGrouped by health goal, with the publications behind each rating
Why people take it
Energy19.3%
Fitness17.2%
Essential Health12.9%
Immune Support12%
Cognition6.2%
Detox5.1%
SuppCo community snapshot, 2026-09-28. Reasons for use are not evidence that it works.
Arginine