For example, levonorgestrel are progestins with high androgenic activity and are more prone to cause acne and excess hair growth (hirsutism) than progestins with less androgenic activity
Comp Biochem Physiol 81C:395399 Ramirez AJ, Brain RA, Usenko S, Mottaleb MA, ODonnell JG, Stahl LL, Wathen JB, Snyder BD, Pitt JL, Perez-Hutrtado P, Dobbins LL, Brooks BW, Chabliss CK (2009) Occurrence of pharmaceuticals and personal care products in fish: results of a national pilot study in the United States
183 Another approach has been based on the observation that emphysema patients showed a marked reduction in the levels of hyaluronic acid, 184 and that therapy with hyaluronic acid protected elastase-induced emphysema in mice
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So when people talk about GHK-Cu before and after results, theyre really talking about a restoration peptide, not a quick-fix cream