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Optimum Nutrition 100% Casein 2 Lbs

24 reviews   |  
Original price $61.99
Original price $61.99 - Original price $61.99
Original price $61.99
Current price $59.99
$59.99 - $59.99
Current price $59.99
SKU 748927024234
Most USA Orders Ship Free Over $99
Excludes drinks, liquids, bars, and foods.
flavor: Chocolate

Protein Powder - Optimum Nutrition 100% Casein Protein 2 Pounds

Casein proteins are a very unique form of protein, casein is ph sensitive, and when they come into contact with the acidic environment of the gut, they turn into a gel. This gel takes a nearly twice as long to digest as other forms of protein. If you are looking for a high quality casein protein that will feed your muscles and keep amino acid levels high for up to 8 hours, this may be the one for you. Introducing Optimum Nutrition 100% Casein Protein.

Optimum Nutrition 100% Casein Protein Flavors

  • Creamy Vanilla
  • Chocolate
  • Cookies & Cream
  • Chocolate Peanut Butter
  • Banana Cream

Optimum Nutrition 100% Casein Protein Benefits

  • 24 Grams Of Slow Digesting Casein Proteins
  • Micellar Casein Rich
  • Supports Muscle Rebuilding
  • Helps With Weight Management
  • Great Source Of Calcium
  • 2013 & 2015 Casein Supp Of The Year

How Do I Take Optimum Nutrition 100% Casein Protein?

Using a shaker cup is the easiest and most convenient way to mix up a consistently great casein shake every time. Just add one heaping scoop of Gold Standard 100% Casein to a shaker cup filled with 10-12 oz of your preferred beverage. Cover and shake for 25-30 seconds. TIP: Adjust the intensity of your Gold Standard 100% Casein by varying the amount of liquid that you use to prepare it. For a bolder flavor with slightly more body and sweetness, mix one heaping scoop with 8-10 oz of water, milk, or your favorite beverage. For a milder tasting, less sweet shake, use 12-14 oz of liquid per scoop.

SPOON STIRRED: If you forgot your shaker cup or don't have time to get out the blender, you can just add one heaping scoop of Gold Standard 100% Casein to a glass filled with 10-12 oz of cold water, milk, or your favorite beverage. Then mix it up with a spoon for about 30 seconds or until powder is dissolved.

SUGGESTED USE: Consume approximately 1 gram of protein per pound of body weight per day through a combination of high protein foods and supplements. For best results, consume your daily protein allotment over several small meals spread evenly throughout the day.

Optimum Nutrition 100% Casein Protein Ingredients

Calories 120

Calories From Fat 10

Total Fat 1g 

Saturated Fat .5g 

Trans Fat 0g

Cholesterol 15mg 

Sodium 190mg 

Total Carbohydrate 3g 

Dietary Fiber 1g 

Sugars 1g

Protein 24g 

Vitamin A 0%

Calcium 0%

Iron 50%

Vitamin C 0%

Other Ingredients: Micellar Casein, Natural And Artificial Flavors, Polydextrose, Gum Blend (Cellulose Gum, Xanthan Gum, Carrageenan), Lecithin, Salt, Malic Acid, Acesulfame Potassium, Sucralose, Aminogenå¨, FD&C Yellow #5.

Allergen Information: Contains Milk and Soy (Lecithin) Ingredients.

Optimum Nutrition 100% Casein Protein Side Effects & Warnings

Do not use as a sole source of nutrition for weight loss or maintenance. Keep out of reach of children. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.


Le Parc A, Honvo Houéto E, Pigat N, Chat S, Leonil J, Chanat E. The membrane-associated form of α(s1)-casein interacts with cholesterol-rich detergent-resistant microdomains. PLoS One. 2014;9(12):e115903. Published 2014 Dec 30. doi:10.1371/journal.pone.0115903


Pauciullo A, Erhardt G. Molecular Characterization of the Llamas (Lama glama) Casein Cluster Genes Transcripts (CSN1S1, CSN2, CSN1S2, CSN3) and Regulatory Regions. PLoS One. 2015;10(4):e0124963. Published 2015 Apr 29. doi:10.1371/journal.pone.0124963

Customer Reviews
4.8 Based on 24 reviews
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Chocolate Mint!

I received a sample of the new Chocolate Mint flavour in my last order. BPN don't stock the flavour yet, but a rep told me they would soon. I really liked the flavour. It was more spearmint flavoured than chocolate, and DIDN'T taste like toothpaste. It tasted like Spearmint milk (I'm not sure if this is available overseas), but I wish I had more samples so I could have tried it in different ways. Hoping it is stocked soon!



This is another one of optimum nutritions awesome products. I dont think there is one product of theirs that ive tried, that hasnt produced results. This stuff mixes great, not clumping or leaving anything in bottom of shaker. And the taste is great, 9 out of 10 times i get the cookies and cream. It is delicious. But main reason i like this is that it is a slow acting protein. So i normally take it before falling asleep so i get all the nutrients i need while im sleeping. If ur looking for good casein protein, this is it.


Pretty good

Out of all the casein proteins i have had, this is one of the better ones ive had. The taste is great. I usually get the cookies and cream, it is one of the better tasting protein drinks ive had. And it mixes good also, leaving no clumps or anything in the bottom of my shaker cup. Like most people i take this late at night before going to bed. That way i can get the nutrients needed, while sleeping. It can be a little expensive, but if you can afford it i would recommend trying it out.


Good Taste And Consistancy

i received a sample of this protein product. this product mixed well, had a good consistency with no lumps, and most importantly tasted great, would definitely recommend.


Cookies & Cream

C&C is a good flavour, but it just doesn't taste like C&C. It is too subdued. However this is a very creamy, thick casein, and great for casein based puddings. It is a slower release protein than whey, and is higher lactose so you won't want to get it if you are lactose intolerant. Mix it with water when cutting, cream when bulking. TL;DR: Texture is great, flavour is neither good nor bad.


A great casein protein powder.

I have had multiple flavors of the ON Casein protein powder. Cookies and cream and Chocolate Peanut butter being my favorites. Sometimes i make a tasty sludge before bed to sustain my amino acid needs while sleeping. I have even mixd it with cottage cheese itself for a casein protein double whammy. It comes 24 grams of protein per scoop and 31 grams of total volume so there is not to much extra filler or nonsense in it. A little bit more expensive than that of whey but definitely worth it in my book. Would recommend to anyone .


Best casein

This is a very good tasting protein so that is a plus. It mixes up relatively easily and keeps you felling full if you choose to use this as a meal replacement, i only take casein right before i go to bed so i don't starve my body of all the protein and hinder my gains i made throughout the day!


Above Average

Overall, this is an above average protein. There are obviously a ton of different proteins out there, so I would suggest trying a few different ones. This one obviously has good casein protein. I would recommend taking it right before bed or for a meal replacement. I took it right before bed and I didn't wake up as hungry. Also, it's a good price and good taste.


Cookie Dough

The problem with fancy flavours is that they name themselves after something that tastes a certain way due to its texture. Cookie Dough is like that. Ask someone what cookie dough tastes like and they describe the texture. So how do you make a protein called Cookie Dough? Well... just don't make it chocolate or vanilla I guess! The protein is tasty enough, but it doesn't taste like Cookie Dough. I would struggle to name it just like ON have, because really it doesn't taste like anything else. The protein itself is a straight Casein, meaning it makes a great pudding. (1 scoop protein + 1.25-1.5 scoops of liquid). This is, in my opinion, the only way to eat Casein, and the only reason you would. Give it a shot. The flavour: Neither for or against it. Just didn't make an impact.



Overall, this protein is decent. It's casein, so I took every night right before bed. Because it is thicker than most whey proteins, I enjoyed the taste compared to others. However, there are still lots of protein out there with better taste. I would recommend mixing it with pancakes, smoothies, etc.


Great for pudding

This protein is great for pudding. Chocolate flavours and Vanilla are awesome. The Raspberry and Banana Cream are.... not great. Try mixing 1 scoop powder with roughly 1.5scoops of water/milk/cream. Awesome pudding!


Pretty good

Overall, this casein protein is an above average protein. It is thicker than Optimum's whey and is a little better tasting. However, there are still some better choices out there. I did wake up less hungry in the morning when I took it right before bed.


Best casein protein

Optimum nutrition 100% casein is the best casein on the market. It's a great protein to take before going to sleep or in between meals . It taste great mixes very well and show a lot off results. I would definitely recommend buying this product


Great For Pre Sleep Shakes!

I used the casein strictly for a pre bed shake every night for a week. Mixed great in a shaker cup with milk. I noticed that I would wake with no real hunger like I would before. Great stuff from a great company!



This is the best casein I have ever taken. Really seeing results from it. I would recommend this to anyone.



This is by far the best caesin protein that I have ever had. It mixes very easily and tastes great. I would highly recommend it.


Does the job

Does its job.. Optimum Casein is perfect to keep those cravings away.. Feel full.. Flavor isn't good or bad.. Chocolate one.. Doesn't taste much like chocolate weird taste but whatever and if your gonna stir hard to mix have clumps... Overall it's alright

A Best Price Nutrition Customer
Steven M.

Just buy it.

This stuff is incredible. Mix it with a little almond milk and sweetener and it really does taste like a cinnamon roll blended into a protein shake. I have tried many flavors, this is now my favorite.


Only Company I Buy Protein From

Optimum Nutrition 100% Casein is a great product, doesn't mix as easily as their whey but still quality product. O.N. Only company protein I buy.


Best Protein...

The best there is. Period!