Health authorities in several countries, such as Australia and New Zealand, have taken steps to restrict its availability, classifying it as a prescription-only medicine despite it not being a legitimately prescribed product
Amino acids : Methionine and L-carnitine encourage optimal metabolic function
GHK-Custimulates blood vessel and nerve outgrowth, increases collagen, elastin, and glycosaminoglycan synthesis, as well as supports the function of dermal fibroblasts
Nebulised/inhaled mainly respiratory, not for skin
While all studies adequately ascertained exposure and ensured comparability between outcome groups by controlling for confounders, 42% (n = 5) did not provide adequate sample representativeness and size, and 17% (n = 2) did not report the non-response rate