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When vitamin C neutralizes a free radical, it becomes oxidized and temporarily inactive
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HPLC (high-performance liquid chromatography) testing verifies peptide purity and identity
Vitamin D3 25-Hydroxyvitamin is produced by hydroxylation in the liver, whereas calcitriol (1,25-dihydroxycholecalciferol), the active form of vitamin D, is produced in the kidney (129)
(9) Fangru Jiang, Yanan Wu, Zhe Liu, Minhua Hong, and Yi Huang (2023) Synergy of GHK-Cu and hyaluronic acid on collagen IV upregulation via fibroblast and ex-vivo skin tests Journal of Cosmetic Dermatology, 2023 Sep, Volume 22 (Issue 9), Pages 2598-2604
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