Optimum Nutrition is a sports nutrition brand founded in 1986 by brothers Tony and Michael Costello in Illinois. The company is best known for Gold Standard 100% Whey, a whey protein powder that has been one of the best-selling protein supplements in the world for decades and serves as the brand's flagship. Optimum Nutrition built its reputation on quality control, operating its own manufacturing facilities and testing raw ingredients in-house at a time when much of the supplement industry relied on third-party production. Its product range extends across the major sports nutrition categories: protein powders including whey, casein, and plant-based options; the Essential Amin.O. Energy line combining amino acids with caffeine; Gold Standard Pre-Workout; micronized creatine monohydrate; Opti-Men and Opti-Women multivitamins; Serious Mass weight gainers; and protein bars and ready-to-drink shakes. Since 2008 Optimum Nutrition has been owned by Glanbia, the Irish global nutrition group, where it anchors the Glanbia Performance Nutrition portfolio alongside sister brand Isopure. The brand is headquartered in Downers Grove, Illinois, and its products are sold in more than 90 countries through specialty retailers, gyms, mass retail, and e-commerce. Many of its products carry Informed-Choice or Informed-Sport certification, which tests supplements for substances banned in sport, making the brand a common choice among competitive and drug-tested athletes.
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