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UK guidelines recommend monitoring clinical response and full blood count (typically at around 2 months) to ensure treatment adequacy, rather than routinely rechecking B12 levels after replacement has started

5 Much of the human data on topical GHK-Cu is from studies that do not specify the concentration used, however, generally products have been used in cosmetic preparations at concentrations between 0.2-2%

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Unopened Vials Unopened, pharmaceutical-grade vials do not strictly require refrigeration