Overall Rating
4.8 out of 5 stars
Reviews (571)
Verified Buyers (550)
Review Graph
  • 5 star
    80%

  • 4 star
    15%

  • 3 star
    3%

  • 2 star
    1%

  • 1 star
    1%

Top Rated Flavors
  • Blueberries & Cream (5/5)
  • Mint Chocolate Chip (4.9/5)
  • Chocolate Supreme (4.8/5)
  • Strawberry (4.7/5)
  • Cookies & Cream (4.6/5)
  • Creamy Vanilla (4.6/5)
  • Chocolate Peanut Butter (4.6/5)
  • Chocolate Cake Batter (4.5/5)
  • Cookies & Cream (4.4/5)
  • Cookie Dough (4.4/5)
  • Banana Cream (4.3/5)
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  • Most Recent
  • Most Helpful
  • All Reviews (571)
  • Verified Buyers (550)
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  • Cookies & Cream
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Michael K
Build Muscle
Verified Buyer
Price has gone up so much. However one of the casein proteins you can buy. Great taste too!*
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2024-03-15 16:10:55Z
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  • Chocolate Peanut Butter
  • Creamy Vanilla
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Nameera P
Build Muscle
Verified Buyer
Packaging could be better, received in bad condition with jar being bit damaged *
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2024-02-24 12:31:22Z
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  • Chocolate Supreme
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Philip R
Build Muscle
Verified Buyer
Great taste and great quality, very smooth on my stomach , its really does the job*
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2024-01-08 13:40:59Z
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Joanne C
Verified Buyer
I love this product, the flavor and consistency is delicious. *
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2023-12-18 13:04:50Z
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  • Chocolate Peanut Butter
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Tomasz R T
Verified Buyer
Great protein! It's like a pudding. Very tasty and nice consictency*
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2023-12-15 15:56:02Z
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  • Chocolate Supreme
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Joanne C
Verified Buyer
I've tried many casein proteins and this one is definitely my favorite!*
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2023-12-02 16:10:23Z
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  • Chocolate Supreme
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Joanne C
Verified Buyer
The chocolate supreme flavor is delicious and mixes well. Thick and not chalky   *
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2023-11-03 09:00:59Z
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  • Chocolate Supreme
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Joanne C
Verified Buyer
I love this flavor, it mixes well and is not chalky. I've tried other casein protein powders but this is my favorite. *
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2023-11-03 09:00:04Z
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  • Chocolate Peanut Butter
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Eric R
Build Muscle
Verified Buyer
Amazing protein, only product I use. Everything else is inferior,*
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2023-10-01 19:33:10Z
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Overall Rating
  • Creamy Vanilla
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Brett D
Verified Buyer
Very good casein but not as sweet tasting as I would like. Bakes well also*
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2023-09-06 12:57:26Z
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  • Chocolate Supreme
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Edlyne B
Burn Fat
Verified Buyer
It is neither good or bad! I like it as a late night dinner *
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2023-08-08 22:42:16Z
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Overall Rating
  • Chocolate Peanut Butter
  • Cookies & Cream
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Kristin Y
Verified Buyer
My favourite brand of Casien by far! The Chocolate Peanut Butter is delicious in my oatmeal!*
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2023-07-23 18:28:09Z
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  • Chocolate Supreme
  • Cookies & Cream
  • Creamy Vanilla
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Kye C
Build Muscle
Verified Buyer
This protein is amazing! It mixes perfect with milk or water and can be used as a dessert in lieu of ice cream*
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2023-07-18 09:21:13Z
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  • Creamy Vanilla
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Joshua M
Sports Improvement
Verified Buyer
Optimum Casein never disappoints. Flavor is awesome. Mixes great. Gets the job done every time.*
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2023-07-05 14:56:53Z
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  • Chocolate Supreme
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Bradley M
Verified Buyer
Insanely great price for my favorite slow digesting protien powder*
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2023-07-05 14:56:53Z
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  • Creamy Vanilla
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Donlupe
Build Muscle
Verified Buyer
Optimum Nutrition Gold Standard 100% Casein Creamy Vanilla Flavor is the best casein I've been ever used. High quality and tastes really good. Keeps me fed all night.*
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2023-05-31 14:47:30Z
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Bradley M
Verified Buyer
My new go to establishment for optimum nutrition, great price.*
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2023-05-16 10:44:39Z
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  • Chocolate Supreme
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Brenton P
Verified Buyer
Taste great, works good. I'll keep buying and using this product.*
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2023-03-16 14:34:58Z
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  • Chocolate Peanut Butter
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CALEB D
Verified Buyer
Does the job and isn't too hard to mix. There's not really a "good" tasting casein protein, but this is one of the better ones*
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2023-02-28 07:41:53Z
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  • Creamy Vanilla
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Donlupe
Build Muscle
Verified Buyer
Nothing beats a stomach full of Optimum Nutrition Gold Standard 100% Casein before bed. I stand behind this product.*
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2023-01-20 19:50:15Z
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  • Cookies & Cream
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Bobby T
Build Muscle
Verified Buyer
Enjoy this protien alot. Mixes well and seems to help with results.*
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2022-12-27 17:49:36Z
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  • Chocolate Supreme
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Jason o
Verified Buyer
Great product. Perfect for pre bedtime protein source. Delicious flavor*
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2022-12-06 03:30:29Z
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  • Creamy Vanilla
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Joshua M
Sports Improvement
Verified Buyer
Amazing taste. Mixes easily and fully. Nice and thick. Doesn’t leave you wanting more. Awesome protein.*
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2022-11-20 10:34:05Z
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Joanne C
Verified Buyer
I love this protein! I've tried other casein but this one mixes the best without tasting chalky. The flavor is delicious and I love mixing it in to greek yogurt and chocolate milk! *
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2022-10-26 10:42:33Z
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  • Chocolate Supreme
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Robyn B
Verified Buyer
I just love this casein. It has great flavor and keeps me full throughout the night!*
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2022-10-24 14:58:24Z
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  • Chocolate Peanut Butter
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Ryan C
Verified Buyer
Great option for casein protein. chocolate Peanut butter is not bad *
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2022-10-18 23:00:33Z
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  • Chocolate Supreme
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Jason o
Verified Buyer
Best tasting casein protein. Great bed time slow digesting protein source . Gained 5 lbs since I switched from a whey protein to casein. Bed time is one of the most critical times to absorb protein because it's the longest amount of time you go without food*
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2022-09-29 03:28:18Z
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  • Creamy Vanilla
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Bxbully
Verified Buyer
This is the best Casein I have tried. It mixes easily. Leave it for a few hours and it gets thick. Vanilla it a great flavor*
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2022-09-22 20:11:11Z
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  • Chocolate Supreme
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Samuel H
Build Muscle
Verified Buyer
Tasty, blends well with water or milk. I've been using it for years.*
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2022-08-30 14:07:06Z
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  • Chocolate Supreme
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Mohammad A
Verified Buyer
Great, as always. Mixes better with milk, which also boosts the taste and you feel like drinking chocolate flavored butter biscuits. *
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2022-08-20 15:53:57Z
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  • Cookies & Cream
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Brian W
Verified Buyer
Thick and great shakes and fluff, easy to use and digest, love the flavor*
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2022-07-12 23:11:09Z
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  • Creamy Vanilla
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Donlupe
Build Muscle
Verified Buyer
A must have for those serious about working out and being in shape.*
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2022-07-07 05:02:00Z
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Jason o
Verified Buyer
Greatest casein protein on the market. Perfect for over night protein source*
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2022-06-28 03:07:31Z
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  • Creamy Vanilla
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DenM
Verified Buyer
I'm a fan of ON products, the protien powders all have a good taste, unlike some that you need to choke down to avoid throwing it out. I mix with milk and ice in a nutri bullet. Not thick and chalking like some others*
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2022-06-17 15:00:57Z
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  • Chocolate Supreme
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LUIZ
Build Muscle
Verified Buyer
I take casein protein on pos-work and before going to bed. It’s an excellent source of slow digest protein and I feel great in the morning.  *
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2022-06-11 21:08:48Z
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Jason o
Verified Buyer
Greatest night time protein available. Slow digestion to ensure steady source overnight*
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2022-06-11 01:31:47Z
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Jason o
Verified Buyer
Great tasting . Slow release casein gives a steady protein source through the long night time hours til breakfast*
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2022-06-04 16:34:18Z
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Moaiyad A
Build Muscle
Verified Buyer
Very good taste with almond milk, high quality . recommended*
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2022-05-15 04:44:34Z
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Jason o
Verified Buyer
Great for pre bed time . Slow release gives me the steady protein source I need to feed the muscles until my morning meal*
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2022-05-07 00:35:27Z
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  • Creamy Vanilla
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Donlupe
Build Muscle
Verified Buyer
Does exactly what it's supposed to do and tastes really great. Good quality product. Highly recommend.*
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2022-05-04 06:39:10Z
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Kevin M
Verified Buyer
Solid product. Love the taste. I'll often use a scoop of casein with a scoop of whey to get a protein super-dose*
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2022-05-02 17:10:55Z
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  • Cookies & Cream
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Katasha B
Contest Preparation
Verified Buyer
I love how this protein powder tastes! I have tried other brands of casein and it is just thick and the taste is lacking. I will keep buying this brand for sure.*
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2022-04-29 03:26:09Z
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  • Creamy Vanilla
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James H
Verified Buyer
Best protein source for overnight muscle  growth and recovery. *
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2022-04-10 17:02:59Z
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  • Creamy Vanilla
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Bxbully
Verified Buyer
Excellent product, wasy to mix. I have tried five of the optimum casein protein powders. The vanilla is the best to me.*
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2022-04-04 20:53:17Z
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Mohammad A
Verified Buyer
Mixes better with milk. Great before bed or during an anticipated fast. *
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2022-03-21 18:33:36Z
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  • Chocolate Peanut Butter
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kelly f
Verified Buyer
Flavor is great! Has just the right hint of peanut butter. Delicious!*
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2022-03-06 01:44:25Z
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Abbass C
Build Muscle
Verified Buyer
Good quality, highly recommended for athletes looking to increase the training volume*
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2022-02-24 19:03:03Z
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Mohammad A
Verified Buyer
Great quality and delivery. I’m residing outside the states and shipped it internationally and I can say it’s worth it.*
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2022-01-03 16:13:18Z
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Salvatore B
Increase Strength
Verified Buyer
Take before bed during weight training days. Slow digestion during sleep, the next day little or no soreness from the workout the day before. Any fitness routine,( especially lifting weights) should be a supplement staple.*
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2021-12-29 20:37:17Z
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  • Cookies & Cream
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Michael T
Verified Buyer
Always have liked this casein for late night. Recommend mixing with whey for quick and slow protein.*
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2021-12-14 17:30:27Z
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* Muscle & Strength does not imply any medical claims from this review. There are no guarantees of specific results and results may vary.
* 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.