If using both, apply them at different times of day, vitamin C in the morning, GHK-CU in the evening
However, if youre not sure, you should ask your doctor to take a blood test to check your vitamin B12 level
Individual treatment response varies, and no specific results can be guaranteed
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Gene identification for the cblD defect of vitamin B12 metabolism
Nasal delivery is theoretically plausible but bioavailability data for this specific peptide do not exist in published literature