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What GHK-Cu adds to the formulation: Gene expression modulation across hundreds of genes including collagen genes (Type I, III), tissue inhibitors of metalloproteinases, anti-inflammatory mediators Collagen synthesis stimulation, specifically Type I and Type III collagen the structural proteins of skin, connective tissue, and many other tissues Anti-inflammatory signaling through investigated effects on TNF-, IL-6, and NF-B pathways Copper-peptide chemistry effects including cofactor activity for skin-relevant enzymes Skin-research and hair-research applications (the GHK-Cu literature in these areas is substantial) For the GHK-Cu deep-dive, see Copper Peptides Explained

So, you would need to inject 0.5 milliliters of the solution to deliver 500 mcg of vitamin B-12

Not only does it provide valuable information, it helps you understand your responsibilities when you decide to administer shots yourself

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We really need more information on this important topic: Why do some individuals need more frequent B12 injections than others