The latter permit stronger contraction of the dual region but require a problem-specific argument establishing preservation of an optimal dual point
While creams and foams are effective in treating the skin, they do not have the deep-reaching effects provided by the GHK injection
"Effect of Epitalon on biomarkers of aging, life span and spontaneous tumor incidence in female Swiss-derived SHR mice." Biogerontology
The strongest human data on GHK-Cu is almost entirely topical, 12-week trials on photoaged skin, wrinkle-volume studies, and gene-expression work going back to Pickarts original research in the 1970s
10.1007/s00167-009-0828-7 Knee Surg
This means it simultaneously activates the receptors for GIP, glucagon-like peptide-1 (GLP-1), and glucagon