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If you are using GHK-Cu after a procedure, follow your providers aftercare instructions

A 2016 comparative study published in Nature Scientific Reports directly compared copper compounds and found GHK-Cu non-cytotoxic across all tested concentrations up to 5,800 micromolar over 72 hours

The effect of ouabain, meralluride and ethacrynic acid on respiration and glycolysis in kidney slices

The microorganisms propionibacterium freudenreichii and pseudomonas denitrificans produce vitamin B12 when they grow in a nutrient medium which provides glucose nitrogen sources and cobalt salts

Brooks/Cole, Belmont Streitwieser A, Heathcock CH (1976) Introduction to organic chemistry, 1st edn