Copper Peptides vs. Retinoid Acid and Vitamin C

A MUST READ:
www.skinbio.com/copper-peptides-aging-reversal-studies.php

Human Skin Renewal Study: 
A clinical study which compared the effect on the skin's production of collagen after using creams containing copper-peptides, vitamin C, or retinoic acid (retin-A). Twenty volunteers applied the various creams to their thighs daily for one month. New collagen production was determined by studying skin biopsy samples using immunohistological techniques.

The study found, that after one month, copper-peptides had the most significant effect on collagen production. Significant increases in collagen production were found in 70% of the persons treated with copper-peptide creams, 50% of the persons treated with the vitamin C cream, and 40% of the persons treated with retinoic acid.

Reference: 
Effects of topical creams containing vitamin C, a copper-binding peptide cream and melatonin compared with tretinoin on the ultrastructure of normal skin - A pilot clinical, histologic, and ultrastructural study. Abdulghani A.A.; Sherr A.; Shirin S.; Solodkina G.; Tapia E.M.; Wolf.Gottlieb A.B.; Dermatology, UMDNJ, Robert Wood Johnson Medical School; Disease Management and Clinical Outcomes.