Yes, studies show GHK-Cu is well-tolerated and non-toxic at cosmetic concentrations
In a breakthrough study, L-carnitine was able to increase hair shaft elongation, prolong the growth phase of the hair cycle, and prevent the cell death of keratinocytes (cells that produce keratin, the protein that gives hair strength)
Weeks 5 to 8 (dose escalation to 0.6 mg) Nausea becomes more noticeable in some individuals as the dose doubles
Clin Nutr Res
Conclusion Carnitine as a nutritional supplement has, since the 1960s, been promoted as beneficial in a number of disorders of human carnitine deficiency of impaired fatty acid oxidation, suggesting that nutritional or pharmacologic supplements of carnitine might be beneficial in some disorders [168]
The median ESR and CRP were 21.0 (7.085.3) mm/h and 3.8 (0.929.1) mg/L, respectively