Because of its bound copper, GHK-Cu is presented as a characteristic blue lyophilized powder, which visually distinguishes it from the white powders typical of uncomplexed peptides
B., Tvrdeic, A., Pavlov, K
Clinically proven magnesium L-threonate for brain support
In fact, on the basis of porphyrin spectroscopic features, the difference in light absorption at 405 and 460 nm should correspond to a similar difference in bacterial photosensitivity: a tenfold reduction of the effect was expected, but only a two-threefold reduction was obtained by shifting the irradiation from 405 nm to 460 nm
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