Gold standard casein protein review

Overview of Optimum Nutrition’s Gold Standard 100% Casein

Leading the way for supplements, Optimum Nutrition’s Gold Standard 100% Casein is the go-to slow-releasing protein powder across the board. Containing a solid dose of protein and BCAAs whilst remaining low in overall calories in fat, it’s suitable for almost any goal and can add it into each and every diet.

Pros & Cons

The biggest benefit is that Optimum Nutrition are a well-known brand within the fitness community and the results speak for themselves with many happy users over the years. Many supplement companies are producing products that don’t work, making it hard to find a brand that you can trust. However, ON’s have been around for so many years and has a long history of producing valuable supplements.

As well as this, the product is extremely versatile as its lack of calories means it can be used for bulking or cutting. The only negative is that if you’re bulking, you’ll need to eat calories from other sources which can be difficult if you have a low appetite.

The other big negative is that because it’s dairy based, it’s unsuitable for those who follow a dairy-free diet such as vegans or in the case of lactose-intolerance.


  • Easy to mix
  • Slow-releasing protein
  • Good to mix in with other calorie sources as a meal replacement
  • Wide variety of flavours
  • Large dose of protein (24 grams per serving)
  • High in Branched Chain Amino Acids (5.5 grams per serving)
  • 5 Grams of glutamine per serving
  • Good brand reputation
  • Low in calories (115 calories per serving)
  • Low in fat (0.7 grams per serving)
  • Low in carbohydrates (3.5 grams per serving)
  • Easy to find
  • Lack of calories which can make bulking difficult
  • Dairy-based which makes it unsuitable for vegans or dairy intolerant individuals


  • Lack of calories which can make bulking difficult
  •  Dairy-based which makes it unsuitable for vegans or dairy intolerant individuals

Product Description & Benefits

Casein is a slow-releasing protein. Compared to whey which gets fully digested in around 4 hours, it can be 8-10 hours before all the casein in your shake has been utilized. This makes it perfect before bedtime when you’re entering into a fasted state for a prolonged period. As well as this, it can help to keep you fuller for longer, much like oats.

Whilst whey is perfect for after the gym when you want immediate protein to kick-start that recovery process, casein can be used at all other times of the day to constantly drip feed your muscles with amino acids.

How to Take Gold Standard 100% Casein

To use ON’s Gold Standard 100% Casein, mix one scoop with 10-12 ounces of either milk if you’re bulking or water if you’re cutting. You can do this in a shaker cup or blender. It’s not recommended to mix with a spoon as you’ll end up with clumps.

You can also bake with the powder or mix it into your morning oats if you don’t want to drink it.

Price and Guarantee

Click here for the best price available

Product Specifications               

Per serving:

  • 115 calories
  • 24 grams of protein
  • 5 grams of glutamine
  • 5 grams of BCAAs
  • 0.7 grams of fat
  • 3.5 grams of carbohydrate


Micellar Casein [Contains Emulsifier: Soy Lecithin], Fat-Reduced Cocoa Powder, Flavor, Salt, Thickeners (Cellulose Gum, Carrageenan Gum, Guar Gum), Sweeteners (Acesulfame Potassium, Sucralose), Enzyme Complex (Amylase, Protease, Cellulase, Beta-D-Galactosidase, Lipase).

Overall Rank

Any Optimum Nutrition product will rank highly due to its affordability, quality, effectiveness, flavour range, and reputation. As previously stated, the supplement industry is a minefield when it comes to finding not only the right product for your goals, but a product that actually works. With Optimum Nutrition you can be assured that you’re getting everything you pay for and more with their 100% Casein.

Sum up

Optimum Nutrition’s 100% Casein is a fantastic product for slowly releasing protein after you’ve eaten it. If you really want to make the most out of your gym sessions, then drinking both whey and casein shakes is vital to get the combined advantages. This casein shake is better suited as a meal replacement, between meals, and before the gym whilst whey is better post-gym to get a head start on the recovery process.

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  1. Hi, Charlie!

    I’m constantly looking for meal replacement because I always find it hard to have the time for a real meal before training so this Casein seems like a good choice.

    Do you know if this is hard on your stomach? One ond few I have tried have been a little harsh on my stomach.

    Thanks for the review!

    Regards, Jan

    • Hi Jan,

      Thanks for the comments you left, Gold standard Casein is a great product, its difficult to say whether the product will be hard on your stomach as result vary from person to person, On’s Gold standard blends and the way there products normally work is that it’s very smooth and very balanced.

      Let me know if you get some I have a link that you can click on that will led to a great price.

  2. Great product with such a great and very well explained review in a simplistic and understandable way. thank you so much for such a great read. I know many people who want to manage their weight and I will share this with all of them as well. Thank you for such a great read.

    • Hi thanks for your lovely comments, I am glad that this information was an easy read and that you will pass it on to others so that they can share in the benefits of this great product.

  3. Thanks for the in-depth review. I did not realize that Casein had such a different absorption rate than Whey! I have a few questions for you. Is it best to take this product before or after a workout? Also, can it be taken twice a day?

    • Hi thanks for your comments, to answer your question casein can be taken between meals, also before the gym whilst whey is a better post-workout option to get a head start on the recovery process.

      Thanks let me know if you require any more information?

  4. Hi Charlie,
    I can see this is good for sporting people as well as people controlling their weight. Its a good review and one looking for help in this area can easily get it from this post you made.
    Good work.

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