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Description
While large randomized controlled trials specifically examining injectable GHK-Cu for hair remain limited, the mechanistic evidence is strong

Hillary Lin, MD such a great post and article

Those most commonly affected include people over 50 as the ability to absorb B12 from food naturally declines with age as well as vegetarians and vegans, those with pernicious anaemia, anyone who has undergone gastrointestinal surgery, and those living with digestive conditions such as Crohn's disease or coeliac disease

[131] Follansbee, History, 64
