For nitrogen source of glutamine, the characteristic absorption peaks of glutamine included -NH 2 stretching vibration at 3664 cm -1 , C-N stretching vibration at 2118 cm -1 and C-O stretching vibration at 1935 cm -1
Interestingly, the same gene expression research that identified this theoretical risk also found that GHK-Cu suppresses RNA production in 70% of 54 genes overexpressed in metastatic colon cancer
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Human clinical trial data remains limited, with Phase I and II trials for inflammatory bowel disease conducted in the 1990s claiming safety with no toxicity, though full peer-reviewed data never appeared in scientific literature
From a formulation standpoint, this mechanism explains why we consistently observe greater stability in finished SAG products than in GSH: GSH oxidizes before it reaches the cell, whereas SAG arrives intact and activates on demand