Alpha-lipoic Acid USP For Compounding (API) [Dietary Supplement] (Rx)Alpha lipoic acid USP active pharmaceutical ingredient (API) is a synthetic form of alpha lipoic acid that is used in the production of pharmaceutical drugs. It is a powerful antioxidant that helps protect the body from damage caused by free radicals and is also thought to have anti inflammatory properties. Ships in 2 4 business days. Alpha lipoic acid has been approved by the United States Pharmacopeia (USP) as an API, which means it is a substance