What it is
Carnosine is a dipeptide composed of the amino acids beta-alanine and histidine, found naturally in muscle tissue. In cosmetics it is valued as an antioxidant that can help neutralize reactive species and bind metal ions, and it is studied for its ability to interfere with glycation. It is water-soluble and used in serums and sunscreens as a supportive conditioning and antioxidant ingredient.
Safety & warnings
Carnosine is a small, body-identical peptide that is well tolerated topically, with low irritation and sensitization potential and no comedogenic concern. It is not a fragrance allergen.
Origin & sourcing
A naturally occurring dipeptide; the cosmetic ingredient is typically produced synthetically or by biotechnological methods.
Questions everyone asks
What is carnosine made of?
It is a dipeptide built from two amino acids, beta-alanine and histidine, and occurs naturally in the body.
Why is carnosine used in sunscreen?
It serves as an antioxidant and skin-conditioning agent that supports the formula alongside the UV filters.