What it is
Proline is one of the standard amino acids and is a notable building block of skin proteins. In cosmetics it is used as a conditioning agent and humectant that helps support skin hydration and a smooth feel, and it is often included in amino-acid complexes alongside other amino acids. In sunscreens it serves as a supporting conditioning ingredient and does not contribute to UV protection.
Safety & warnings
Amino acids such as proline are generally very well tolerated and gentle, including on sensitive skin. It is not a recognized allergen and is not associated with comedogenicity.
Origin & sourcing
Can be obtained through fermentation or other manufacturing processes; the same amino acid occurs naturally in proteins throughout living organisms.
Questions everyone asks
What does proline do in skin care?
It acts as a skin-conditioning and humectant ingredient and is a natural building block of skin proteins, used to support hydration and smoothness.
Is proline suitable for sensitive skin?
Amino acids like proline are generally mild and well tolerated, making them suitable for most skin types, including sensitive skin.