The Peptide Craze Ground Truths My Sunday facial before and after..After 18 KLOW injections. I can't get enough of the science behind this!! The peptides I use test at 99% purity. That is as high as a I thought a beauty peptide would be harder to measure the effects, but Im excited to report noticeable change within the first 2 weeks. Sometimes change happens at a slower pace based on our Glow Peptide Injection: Revolutionizing Skin Rejuvenation Hubmed