OPTIMUM NUTRITION

Optimum Nutrition (ON) is a globally acclaimed sports nutrition brand, founded in 1986 by brothers Tony and Michael Costello. Since then, it has become part of the Glanbia group—a world leader in nutrition—while maintaining its pioneering spirit.

The brand stands out by producing its own products in state-of-the-art facilities (e.g., in Middlesbrough, Aurora, USA), ensuring stringent quality control from raw materials to finished goods. Their facilities are cGMP, Informed Sport, and BRC Certified—guaranteeing the highest standards of purity and safety.

ON’s iconic Gold Standard 100% Whey remains the world’s best-selling whey protein. The brand also pioneered the Gold Standard 100% Casein (slow-digesting protein), the Essential Amino Energy drink powder ("anytime energy" category), and convenient protein snacks like Optimum Protein Bar and Protein Crisp Bar

Today, Optimum Nutrition products are available in over 90 countries and is a market leader in protein nutrition—trusted by elite athletes and fitness enthusiasts worldwide.