Optimum Nutrition, Inc. (ON) is part of Glanbia, a leading international cheese and nutritional ingredients group. There Gold Standard 100% Whey is among the best selling whey products worldwide. Before a single machine is turned on in their manufacturing facilities, their procurement professionals carefully select the most premium raw materials. A Certificate of Analysis is required for every ingredient, which is then tested and retested for compliance. Their quality assurance team performs daily inspections of their current Good Manufacturing Practices compliant facilities, which are Certified for Sport by NSF.