Peptides are changing the way we take care of patients. Learn about the newer ingredients and their uses. When recommending anti-aging creams and lotions to patients, you likely have run across a number of peptide ingredients. These elements of human cells have led to a new class of products for skin care professionals. They are made from amino acids, which are essential building blocks of life. Peptides provide smaller protein molecular chains which are able to penetrate the skin. Chemists are able to synthesize these chains for specific functions, such as stimulating collagen or fighting off environmental insults. This overview provides some of these more popular ingredients.