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GHK-Cu also stimulates both collagen synthesis and matrix metalloproteinases that break collagen down, so unbalanced or excessive use could in principle disrupt extracellular-matrix homeostasis

Th ba, vitamin C l cht xc tc quan trng cho qu trnh chuyn ha cht bo thnh nng lng trong c th

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They are not interchangeable, and the more interesting question is not "which wins?" but "do they reinforce each other?" This article compares the two on mechanism, evidence, and practical use and then examines the documented and theoretical basis for combining them, including the important safety limits

In most other people, deficiency due to inadequate consumption of vitamin B12 is unlikely