Editing Ornithine (section)

===Weightlifting supplement===
Amino acid supplements, including <small>L</small>-ornithine, are frequently marketed to bodybuilders and weightlifters with claims of increasing levels of [[human growth hormone]] (HGH), muscle mass, and strength. A short, four-day clinical study conducted in 1993 reported that <small>L</small>-ornithine, in combination with <small>L</small>-arginine and <small>L</small>-lysine at 2 g/day each, did not increase HGH levels.<ref>{{cite journal |vauthors=Fogelholm GM, Näveri HK, Kiilavuori KT, Härkönen MH |title=Low-dose amino acid supplementation: no effects on serum human growth hormone and insulin in male weightlifters |journal=International Journal of Sport Nutrition |volume=3 |issue=3 |pages=290–297 |date=September 1993 |pmid=8220394 |doi=10.1123/ijsn.3.3.290}}</ref> A review published in 2002 concluded, "The use of specific amino acids to stimulate GH release by athletes is not recommended."<ref>{{cite journal |vauthors=Chromiak JA, Antonio J |title=Use of amino acids as growth hormone-releasing agents by athletes |journal=Nutrition |volume=18 |issue=7–8 |pages=657–661 |year=2002 |pmid=12093449 |doi=10.1016/s0899-9007(02)00807-9}}</ref>