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10.2174/1389200223666220128143133 113 SongJ.ZhengS

Identified as an endogenous peptide complex, GHK-Cu has been detected in various biological fluids and is known to interact with copper ions to form a biologically active complex

Peptides are short chains of amino acids found in every cell in the human body

That is why it is important to measure both B12 and MMA at the same time, as an elevated MMA can indicate B12 deficiency even if the B12 is normal. When the levels come back, ask to see them yourself and ask questions of your doctor if there is any question of normal B12 metabolism. In my case, my B12 levels were very low and my MMA levels were very high, indicating B12 deficiency