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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
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DSIP also shows stress-reducing properties in some studies
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The inactive form, bound to transcobalamins I and III, is holohaptocorrine, represents 75%80% of the total measured vitamin B12 [14,15]
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