Optimum Nutrition 100% Casein Gold Standard Review

Overall Score4
  • Quality of Ingredients
  • Protein Content
  • Price
  • Taste & Mixability
  • Other Reviews


Ingredients  Ingredients

Casein is a slower absorbing protein in contrast to the much faster absorbing Whey protein. It’s a good idea to use both proteins or get one of the blended ones recommended here. There’s more information about this on the Types of Protein Powders page at the top of this website . The quality of the ingredients is good and it has no fillers. I also found it fine on my stomach when I took it.


Protein Content  Protein Content

Each serving ( 33g) has 24g of protein and also 9g of BCAAs which is very high.


Price  Price

Pricewise it is around average at $0.78/oz.


Taste & Mixability  Taste

Taste wise it is one of the better tasting casein proteins and I found it had a nice chocolate taste and not too artificial. I would however recommend using a blender as it does leave a few clumps if you just shake it in a bottle. Once blended though it is nice and creamy.


Other Reviews  Other Reviews

This is a very popular casein based protein powder and scores high marks on several different review sites, scoring an average mark of 4.5 out of 5 on Amazon.


Product Features

    • Anti-catabolic or muscle-protecting proteins
    • Slow digesting protein that is beneficial throughout the day
    • Takes twice as long to be broken-down into their amino acid subcomponents, than whey and other proteins


Product Description

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. 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.

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