Your immune cells particularly T lymphocytes and natural killer (NK) cells require adequate glutathione to function
GHK-Cu: A tripeptide (glycyl-L-histidyl-L-lysine) capable of binding copper ions, forming a bioactive copper-peptide complex
Until rigorous, randomized, placebo-controlled trials are conducted and published, the responsible position is to rely on proven, evidence-based approaches to recovery and healing, and to leave unapproved peptides where they belong for now: in the laboratory, not in your body.
Some side effects have been observed after high-dose supplementation of L-carnitine, such as diarrhea, intestinal problems, and trimethylamine production that causes a fishy odor
doi:10.1111/nyas.13996
doi: 10.1186/1479-5876-12-104 50 KingA