Yes, creatine supplements have an expiration date, but creatine monohydrate is very stable and often works for a year or two, or even longer, after that date if you store it well.* This sets creatine apart from many other supplements
What makes the GHK-Cu hair story interesting is not that it competes with established treatments it does not, at least not yet in clinical evidence weight
Kawamori D, Kurpad AJ, Hu J, et al
Circulation 136 , 23372355 (2017)
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However, the metabolic benefitssuch as improved insulin sensitivitycan sometimes persist longer as your body adapts to its new weight and metabolic state