Propylene glycol USP/EP (pharmaceutical grade) is the propylene glycol grade that meets the strict product quality and handling standards. These standards are required by the authorities responsible for consumer health and safety of materials used in health-sensitive applications, such as pharmaceuticals, foodstuffs, cosmetics and animal feed. These quality requirements are specifically described in the Pharmacopoeias while handling requirements are prescribed in governmental regulation and industry guidelines.
Propylene glycol USP/EP (pharmaceutical grade) is used as a non-active, "enabling" agent (excipient)