Probucol is an antioxidant used in biologic formulations, particularly for cardiovascular applications. By stabilizing lipids and other components, it helps maintain the potency and effectiveness of biologics. As a USP reference standard, it ensures the consistency and quality of biologic products, particularly in the development of therapeutics aimed at managing lipid levels in patients.

The United States Pharmacopeia (USP) provides quality standards for biologics to ensure their safety, efficacy, and quality throughout the manufacturing process. These standards assist manufacturers in adhering to regulatory requirements and help safeguard public health by reducing risks associated with biologics.