Does ornithine work?

Overall Effectiveness Rating for Ornithine

The overall effectiveness rating for ornithine is 2.7 out of 3. This rating means there is ample evidence that using ornithine will lead to positive results.

Overall Confidence Rating for Ornithine

There are 2 studies in the database on ornithine; the confidence rating is 20. A score above 80 means the effectiveness rating for this supplement is reliable. A score under 80 means there is insufficient evidence to ensure a reliable effectiveness rating. Note, this rating is for ornithine as a whole. There are also individual ratings for the claims below.

Products Containing Ornithine

Products Containing Ornithine
REM Sleep Aid
Rhino Black
Warning Pre-Workout
Full list of all 3 products containing Ornithine.

Individual Claims

The overall ratings above do no necessarily reflect each claim about ornithine. Individual claims can have higher or lower ratings. For example, some supplements may have a lot of backing for one claim, but be completely useless for another. Click on claims below for more information.

Performance Claims Effectiveness Rating Confidence Rating
improve cycling performance
decrease fatigue

Hormone Function Claims Effectiveness Rating Confidence Rating
increase levels of growth hormone


Title of Study
Arginine and ornithine supplementation increases growth hormone and insulin-like growth factor-1 serum levels after heavy-resistance exercise in strength-trained athletes
L-ornithine supplementation attenuates physical fatigue in healthy volunteers by modulating lipid and amino acid metabolism