GHK-Cu works on the follicle itself: it enlarges hair follicle size, strengthens follicles at the structural level reducing the miniaturization that drives androgenetic alopecia and stimulates angiogenesis to improve blood supply to the scalp
In the STEP-4 randomized trial (Rubino and colleagues, JAMA, 2021), the 803 adults who switched to placebo at week 20 regained about 6.9 percent of body weight over the next 48 weeks, while those who continued semaglutide kept losing
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Decades of subsequent research have broadened the picture
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It plays a role in normal protein metabolism, helps the body form red blood cells, and supports maintenance of the nervous system