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Description
Oral administration results in the least absorption
B12 is necessary for the production of serotonin, a chemical responsible for regulating mood

Many people have reduced absorption due to age, medication, or digestive issues

How GHK-Cu Compares to Retinoids, Vitamin C, and Other Anti-Aging Ingredients The 1998 head-to-head trial by Abdulghani measured procollagen synthesis side by side, and the copper-binding peptide outperformed both vitamin C and tretinoin

The mechanism involves NAD+-dependent enzymes critical for glucose metabolism