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Optimum Nutrition GOLD STANDARD 100% Casein | Casein Protein | 4 FLAVOURS

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100% Casein Gold Standard protein by Optimum Nutrition. It contains ultra pure micellar Casein protein that will assist you in muscle growth. Many people looking for muscle mass choose Casein. Additionally, if you are currently dieting, you can be certain that casein will help maintain that hard earned muscle mass. 

Sometimes slower is better - especially when it comes to the rate of protein digestion. While rapid protein absorption is desirable immediately before or after exercise, delayed release is probably more beneficial throughout the remainder of the day; Optimum Nutrition's Casein is the ideal slow release protein to add to your supplement stack.

Casein proteins are pH sensitive and gel in the acidic environment of the stomach. As a result, it can take more than twice as long for caseins to be broken down into their amino acid subcomponents than whey and other proteins. Because of their unique time-released qualities, caseins are aptly described as anti-catabolic or muscle-protecting proteins.


  • 24 Grams of Casein Protein per Serving to Help Build and Maintain Muscle
  • 100% of the protein from Micellar Casein, slow digesting for round the clock protein coverage
  • Nearly 5 Grams of Naturally Occurring BCAAs per Serving to Support Endurance and Recovery
  • Low levels of sugar (1 gram) and fat (0.5-1 gram) and less than 120 calories
  • Mixes Easily Into Cold Water or Milk 


Faster digesting protein is desirable immediately before and after exercise to help refuel recovering muscles, but slow digestion and absorption may be more beneficial at other times including bedtime when your body typically goes for hours without food. Casein products are acid sensitive and thicken in the stomach. Compared to some other proteins, it can take longer for our Gold Standard 100% Casein to be broken down into its amino acid subcomponents. By using only premium micellar casein as a protein source, Optimum have created a formula that sets the standard for slow digesting protein support.