text.skipToContent text.skipToNavigation
Get a free Whipped Protein Bar and Pre-Workout Shot ​with every order of GSW 2270g​


Quality assurance 
Before a single machine is turned on in our manufacturing facilities, Optimum Nutrition 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. Quality assurance performs daily inspections of our current Good Manufacturing Practices (cGMPs) compliant facilities, which are GMP registered. The Plant is also informed Sport and Informed Choice registered and retains a Grade A BRC food certificate. Optimum Nutrition is a Preferred Supplier to the English Institute of Sport (EIS).

Once we have picked your order we will send you a copy of the test certificate with your order dispatch email. If you do not receive it with your order dispatch email, please wait until your product arrives and then using the batch number on it, download a copy of the certificate from our website.
33 products

Sign up for weekly offers, news and advice

Plus 15% off your first order