Proline is a nonessential proteinogenic amino acid, the main building block of dermal collagen. It is also a cyclic secondary amine widely found all over the human body synthesized from glutamic acid. L-proline is a common ingredient used as a flavoring agent and nutritional supplement in the food industry.

Scientific studies confirm that applied topically, L-proline enhances collagen production in the dermis while maintaining youthful skin. It is also a part of skin NMF (Natural Moisturizing Factor), a group of molecules produced in corneocytes, which ensure natural skin hydration.

In addition, it can serve as an antistatic, hair, and skin conditioning agent in personal care applications. Due to its significant role in skin structure maintenance and easy dermal absorbance, L-proline is a prominent ingredient in anti-aging skin care formulations.