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GHK-Cu (Copper Peptide) represents one of the most promising compounds for addressing loose, sagging skin through its documented ability to stimulate collagen production by up to 70% and increase elastin synthesis by 30%

Further to that, vitamin b12 can help to defend your body against pathogens to maintain a healthier immune system

Karras, Aristotle University of Thessaloniki, Greece Reviewed by Rutong Wang, University of South China, China Alak Kumar Syamal, Swami Vivekananda University, India Updates Copyright 2026 Subakathulla, Manoj, Patanwala, Premvignesh, Maher Alobaid, Majie, Gorain, Dutta, Sengupta, Rosas and Roychoudhury

Parathyroid hormone and vitamin D: From bench to bedside