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GHK-Cu occurs naturally in human blood plasma, declining from approximately 200 ng/mL at age 20 to just 80 ng/mL by age 60, which correlates directly with the visible signs of skin aging and laxity
PMID 11574992
Some dog breeds have an inherited disorder that makes it difficult for them to absorb cobalamin
J Neurosci 30(5):17391749 Reichardt LF (2006) Neurotrophin-regulated signalling pathways
The remaining authors were of unknown gender ( n = 2,667)
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