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Vitamin B12 Deficiency Is Rare The liver can store excess vitamin B12, and only trace amounts are lost through daily bodily functions such as urination, perspiration, and defecation

The "GHK" designation comes from the single-letter amino acid codes: G = Glycine H = Histidine K = Lysine (using K because L was already assigned to Leucine) Natural Occurrence and Age-Related Decline In human plasma, GHK-CU levels start at approximately 200 ng/mL at age 20

Drug design, development and therapy , 16 , 19631974.