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This article covers both ingredients honestly the mechanisms, the research, the side effects, the practical considerations, and how to think about using them together or choosing between them
Skin Repair Pathways MMP/TIMP, Collagen & Elastin (PMC, 2015) A focused review of GHK as a modulator of multiple skin regeneration pathways published in PMC confirmed that GHK-Cu stimulates both synthesis and breakdown of collagen and glycosaminoglycans, and modulates the activity of matrix metalloproteinases (MMPs) and their inhibitors (TIMPs)
References inline (PubMed / NEJM citations as available)
Possible Side Effects of Methylcobalamin Injection This injectable is thought to be particularly beneficial for addressing vitamin B12 insufficiency in the body
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