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The 28-day limit comes from the manufacturer label and from United States Pharmacopeia (USP) guidance, not from a guess

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This guide explains why B12 levels drop, the symptoms to look out for, and how B12 injections can help restore energy and wellbeing

There's no chemical incompatibility between GHK-Cu and retinol - they work through entirely different pathways - but if your skin is sensitive or you're new to one or both, give them separate evenings until you know how your skin responds

Kristina Semkova explains that declining estrogen levels cause the body's collagen production to slow down, leading to thinner skin and dryness, which provokes itchiness