ghk-cu tolerance downregulation desensitization loss of effectiveness over time Tripeptide–copper complex GHK‐Cu (II) transiently improved healing outcome in a rat model ACL reconstruction - Fu - 2015 - Journal of Orthopaedic Research The Human Tripeptide GHK-Cu in
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L.Van HiepN.et al (2021)

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In addition to reducing intake of the vitamin itself, bariatric surgery may diminish the secretion of intrinsic factor in the stomach, which is normally produced and released in response to food intake (Marcuard et al., 1989)

Zeng, Z
