Peptides are small molecules that can penetrate the barrier of the epidermis and have an impact on the dermis, or deeper layer of skin. These have the advantage of producing rapid, visible changes in the appearance of the skin. Specifically, they can cause tightening and the appearance of firming in the skin.
Algae peptides are a unique extract from the Hawaiian Sea that have a component called hydroxyproline, an unusual amino acid that is rarely found in the skin except within its own collagen. Algae peptides are particularly impressive in their moisturizing and firming properties when applied to the skin.