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Reviews typically cant control for confounders (diet changes, exercise, stimulant intake, sleep, stress, or other supplements), and negative experiences are often underreported
GHK-Cu modulates gene expression in fibroblasts to increase collagen production
[12] Gastric acid-suppressing agents (proton-pump inhibitors and H-receptor antagonists) diminish dietary B12 liberation from protein complexes, a pharmacodynamic interaction that can exacerbate underlying deficiency
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