Optimum Nutrition Protein Water

Optimum Nutrition (ON) was established in 1986 by brothers Tony and Michael Costello. The brand was founded in the United States with the goal of providing high-quality, innovative sports nutrition products. It quickly became a market leader, particularly known for its Gold Standard 100% Whey protein, which is recognized globally as one of the best-selling protein supplements.

In 2008, the brand underwent a significant transition when it was acquired by Glanbia, a global nutrition group headquartered in Ireland. Under Glanbia's ownership, Optimum Nutrition has expanded its reach significantly, utilizing a global manufacturing network. While the brand has its roots and major production facilities in the United States, its products, including this Protein Water, are manufactured in various locations across the UK, Europe, and Asia to serve international markets like Slovakia.

Today, Optimum Nutrition continues to operate as a premier brand within the Glanbia Performance Nutrition division. The ultimate owner, Glanbia plc, is a multi-billion dollar entity that manages a diverse portfolio of nutrition brands, ensuring that the legacy of quality and innovation started by the Costello brothers remains central to the brand's global strategy moving into 2026 and beyond.