Disclaimer: This review made is of my honestly held opinion and am not a statement of fact.

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Premium whey casein supplement for your timed-release gains

  • One of the better casein out there with clear consistency.
  • Acceptable taste, nothing fancy, will get you chugging down the casein without any issues.
  • No bowels issue for my sensitive stomach when using this.

Duration length of product testing: 4 weeks

Optimum Nutrition Casein

Editor’s Review

The nutritional support that whey protein offers has a time limit. It is quickly digested to provide amino acids that are needed to aid recovery and stimulate new muscle growth. Since both these processes require time, whey alone is insufficient. Casein on the other hand, is a slow-digesting protein. Unlike whey, casein provides longer lasting nutrient support that is ideal in those times when protein cannot be ingested- such as during sleep.

Optimum Nutrition Casein

ON’s Gold Standard 100% Casein is a slow-time released supplement protein that is digested very slowly. Optimum Nutrition Casein contains 24g of protein and 5g of BCAAs per serving. Micellar casein is the only kind used in the product. Thanks to its acid sensitivity, it gels in the stomach, forming a mass that takes longer to be broken down. This causes a slow release of amino acid into the system and this process may take as long as 8 hours. It is this slow-digesting characteristic that creates a muscle-protecting effect.


The supplement is available in 2lbs and 4lbs containers, with the former going for $40, depending on where you shop. You get 27 servings in this tub. It’s not the cheapest offering in its class, but it carries the reputation of a brand that has grown to be trusted by so many athletes.

Taste and Mixability

Gold Standard 100% Casein comes in an array of different flavours. It is very easy on the palate, and the shakes it helps constitute are very delectable, even when you use plain water. Milk or fruit juice can be used. The shake is noticeably thicker- unsurprising considering this is an intrinsic characteristic of casein. Its texture is smooth, and when an electric blender is used, it achieves consistency quickly without leaving any clumps behind.


Customer satisfaction is high with this casein supplement, with some users going as far as calling it the best night-time slow-releasing protein there is in the market. The use of micellar casein has earned it a reputation of quality. It supports lean muscle gain and shortens recovery period as advertised. It also delays hunger, as users who use it report not waking up less hungry.

The supplement should be used ideally before bed, or during the day between meals when a slow delivery of protein is desired. One scoop dissolved in 10oz of beverage constitutes one serving. 1-2 servings per day is thought to suffice.

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