Your skin is made out of collagen: http://thedermblog.com/2008/06/23/do-peptides-in-skin-care-products-work/ , and if you’re older, your skin has less of it and if you’re younger, your skin has more.
In many anti-wrinkle products they prominently advertise peptide as a miracle cure for wrinkles. But what are peptides: http://en.wikipedia.org/wiki/Peptide ? “Peptides are short polymers of amino acid monomers linked by peptide bonds”. They contain fewer amino acids than proteins.
What do they do for you? They can reduce inflammation, have an anti-oxidant effect and help regulate bodily functions.
Because wrinkles are caused by a breakdown in collagen, peptides can play a perfect role in building within this equation. They help with cellular turnover, which can reduce the appearance of wrinkles.
However, there are drawbacks to peptides. Firstly, they are expensive and water can break the bonds of peptides. Also, if peptides are absorbed, they can actually breakdown other peptides. However, chemists are able to overcome these issues with different formulations.
The problem with buying skin care products with peptides is that they’re very expensive and many products advertise them when in fact they only contain a small ineffective amount. It is important to request the research behind the product.