l-Proline

L-Proline (CAS 147-85-3) is a naturally occurring cyclic amino acid, also abbreviated as Pro, L-Pro, or H-Pro-OH. Unlike most amino acids, its secondary amine structure gives it distinct conformational rigidity. It carries no assigned E-code and is classified under HS code 29339990.

In personal care formulations, L-Proline functions as a humectant and skin conditioner by binding water molecules within the stratum corneum, reducing transepidermal moisture loss. In food and flavoring applications, it contributes to Maillard reaction browning and acts as a flavor precursor in baked goods, confectionery, and savory products.

L-Proline is available as a white crystalline powder in food-grade and cosmetic-grade specifications, with compliance to FCC and Ph.Eur. monographs depending on application. The substance is registered under REACH and supplied across Europe in standard packaging formats suited to industrial procurement volumes.