It is NOT as simple as it sounds, there is A LOT that goes in to making a peptide, (and then testing it for stability and purity and consistency) before it can be used clinically
doi:10.1016/j.jconrel.2011.01.030
Qu es la L-Carnitina
(PubMed) Inglis JE, Lin PJ, Kerns SL, et al
Best pairing: L-Carnitine + training session for energy production and fat loss support
Secondary carnitine deficiency can be caused by increased losses, pharmacological therapy, a number of inherited metabolic disorders [38], poor diet or malabsorption of carnitine, from increased renal tubular loss of free carnitine (Fanconi syndrome), haemodialysis, peritoneal dialysis, or the increased excretion of acylcarnitines[39] with certain drugs