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Frontiers | Vitamin deficiencies and Alzheimer's disease: evidence and implications for supplementation
For this kind of slow, age‑related thinning, copper peptides are among the more mechanistically grounded topical options: GHK‑Cu and AHK‑Cu both support collagen and the extracellular matrix, provide antioxidant and anti‑inflammatory effects, promote VEGF‑linked microcirculation, and stimulate follicle‑regulating cells in lab models
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Even when intrinsic factor is missing, roughly 1% of an oral dose crosses the gut by passive diffusion — a mechanism documented across multiple randomized trials — without requiring intrinsic factor