GHRP-6 is not approved anywhere
In addition to use on the face, one study of GHK-Cu applied to the skin of the thigh also noted improvement in lines, wrinkles, skin density, and even improvements in mottled pigmentation
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Bioavailability is the term used to describe how much of a substance actually reaches the systemic circulation and is available for use
H.WengC
Most considerations of non-animal alternatives for skin irritation/sensitization testing tend to examine a single aspect of the process (e.g., chemical reactivity, epidermal bioavailability, dendritic cell responses)