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The standard research protocol is 300 mcg per day, subcutaneous, administered in a fasted state, typically in the morning before food or exercise
Tanzilli G, Truscelli G, Arrivi A, et al
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Adults over 50 are more likely to develop B12 deficiency without realizing it, especially if symptoms like fatigue, memory loss, or mood changes are attributed to aging itself
At the cellular level, GHK-Cu activates hair follicle stem cells, demonstrated by measurable follicle enlargement in animal studies
Protein or zinc deficient diets can alter copper metabolism, so a malnourished individual might observe different outcomes than someone with adequate nutrition
