It seems like most studies with amino acids are done by injection rather than taken orally.. This is also the case in race horses.. I notice alot of their supplementation is by injection.. Are amino acids better taken by injection rather than orally? If so, how come you don't see or hear about companies offering amino acids like (arginine, glutamine, leucine, etc.) in hefty doseages by injection.. It seems like if someone put toghether a super amino profile (since bodybuilders use so many of them) in an injectable form.. Then you can take your morning, preworkout, postworkout, betime, etc. injections and get everything your looking to supplement..