Peptides are amino acids that are the building blocks of certain proteins needed by the skin, like collagen and elastin. These proteins are the foundation of your skin and make up skin texture, smoothens and skin barrier strength.
Peptides found in skincare mainly function as hydration binders - they bind moisture to the skin, making it plump and smooth. This is a great way to reduce lines and wrinkles due to lack of moisture, give the skin an even and hydrated glow and strengthen the skin barrier to reduce redness and inflammation.
Peptides in skincare do not build or create new peptides in your skin - this is just false marketing.