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You don't have to constantly inject yourself with anything, and that alone is a major point of distinction between a GHK-Cu injection vs topical

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10.1111/wrr.13148 329 ZhouY.TangJ.LanJ.ZhangY.WangH.ChenQ.et al (2023)

The recommended dosage of hydroxocobalamin, a form of Vitamin B12 injections, typically involves an initial series of injections several times a week

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