Spring into New Arrivals! Reset and refresh with the latest products from top brands! Be the first to try the newest protein and more.
7 Day Customer Support
  • Live Chat
  • 1-800-537-9910
USD
ON 100% Casein Gold Standard Protein

Optimum Nutrition Gold Standard 100% Casein

An Product
Slow-Digesting Protein for Overnight Muscle Recovery*
  • 24g of slow-digesting micellar casein per serving
  • Nearly 5g of naturally occurring BCAAs
  • Ideal for use between meals and before bed
  • 110-120 calories per serving
M&S Rewards Logo
Muscle & Strength Rewards

Earn 2 points for every dollar you spend at Muscle & Strength! Spend your points on order discounts, fitness gear and exclusive products.

M&S Promos and Deals Logo
Unbeatable Deals

We run the best deals and discounts on the biggest nutrition and fitness brands!

M&S Delivery Truck
Free Shipping on $99+ Orders*

Spend $99 to get FREE shipping in addition to our unbeatable deals! Plus, 100% money-back guarantee on every product we sell.

*USA Only. Excludes: AK, HI, orders above 25lbs and bulk orders.

Credit Card Logo for Refunds
60 Day Guarantee

Not happy with your purchase? No problem. Simply return it to us within 60 days and we'll replace it, credit your account, or give you a full refund.

Mobile Phone Logo
Contact Us

If you have any questions about products please call us on 1-800-537-9910 or email support@muscleandstrength.com

Deals
LIMITED TIME PRICE CUT
LIMITED TIME PRICE CUT
Buy 1 ON Gold Standard 100% Casein 4lbs for only $79.99! Limited time only.
Buy 2 for $79.99
Buy 2 for $79.99
Buy 2 ON Gold Standard 100% Casein 2lbs for only $79.99! Limited time only.
Buying Options
$53.99 53.9900
2lbs
25 Servings | $2.16 Per Serving
Buy 2 for $79.99
+
$92.99
$79.99 79.9900
4lbs
53 Servings | $1.51 Per Serving
LIMITED TIME PRICE CUT
+
 
Secure Transaction
Nutrition Info

2lbs Chocolate Peanut Butter

Serving Size: 34g (About 1 Scoop)
Servings Per Container: 25
Amount Per Serving
Amt
%DV
Calories
120
Total Fat
1g
1%
Cholesterol
15mg
5%
Sodium
240mg
10%
Total Carbohydrate
4g
1%
Dietary Fiber
1g
4%
Total Sugars
1g
Includes 0g Added Sugars
0%
Protein
24g
48%
Calcium
500mg
40%
Iron
1.4mg
8%
Potassium
200mg
4%
Magnesium
85mg
20%
Zinc
11mg
100%
Not a significant source of saturated fat, trans fat and vitamin D.
* % Daily Value is based on a 2,000 calorie diet. Your daily values may be higher or lower based on your calorie needs.
† Daily Value (DV) not established.
Ingredients
Micellar Casein, Cocoa Powder (Processed with Alkali), Natural And Artificial Flavor, Salt, Gum Blend (Guar Gum, Gum Acacia, Xanthan Gum), Sunflower and/or Soy Lecithin, Magnesium Oxide, Acesulfame Potassium, Sucralose, Zinc Sulfate Monohydrate.
Allergen Warning
Contains: Milk and Soy.

Mix 1 scoop into 8 to 14 fluid ounces of cold water or milk using a shaker cup. For best results, mix up your shake 30 to 60 minutes after your workout, before bed, or use as an anytime snack.

For healthy adults, consume enough protein to meet your daily protein requirements with a combination of high protein foods and protein supplements throughout the day as part of a balanced diet and exercise program. Keep out of reach of children.

Directions
Warnings
Expand Info
Product Information

Beyond the Basics

  • 24 Grams of Protein per Serving to Help Build and Maintain Muscle*
  • Nearly 5 Grams of Naturally Occurring BCAAs per Serving to Support Endurance and Recovery*
  • Ideal for Use Between Meals and Before Bed
  • 40% of the Daily Value for Calcium per Serving
  • 110-120 Calories per Serving
  • 0.5-1 Gram of Fat per Serving
  • 1 Gram of Sugar per Serving

Casein, a slower digesting and absorbing protein can be used after exercise, between meals or before bed to help support satiety and muscle recovery. GOLD STANDARD 100% CASEIN™ delivers BCAAs to recovering muscles for several hours. By using only premium micellar casein as a protein source, we’ve created a protein powder that sets the GOLD STANDARD® for slow digesting protein support.

Muscle Fuel Around the Clock

Optimum Nutrition has you covered day and night. Try Optimum Nutrition 100% Whey Gold Standard before and immediately after workouts for a fast-acting rapid shot of amino acids right when you need it, and Optimum Nutrition 100% Casein Gold Standard between meals and before bed for prolonged, sustained coverage.

Reviews
Overall Rating
4.7 out of 5 stars
Reviews (580)
Verified Buyers (559)
Review Graph
  • 5 star
    80%

  • 4 star
    14%

  • 3 star
    4%

  • 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 )
  • Show More +
    Show Less -
Overall Rating
  • Chocolate Peanut Butter
  • Show More +
    Show Less -
User Image
King V
Verified Buyer
Mixes easily and the Chocolate Peanut Butter is the best flavor!*
Was this helpful?
You found this not helpful
0 of 0 found this helpful
2024-05-21 17:20:00Z
Loading
Overall Rating
  • Chocolate Supreme
  • Show More +
    Show Less -
User Image
Joanne C
Verified Buyer
I love this protein powder, it is my favorite protein that I have tried.*
Was this helpful?
You found this not helpful
0 of 0 found this helpful
2024-05-15 04:25:02Z
Loading
Overall Rating
    Show More +
    Show Less -
User Image
Odri M
Verified Buyer
Best casein, flavor is very good and mix excellent, I have been using this brand for years.*
Was this helpful?
You found this not helpful
0 of 0 found this helpful
2024-05-10 13:39:28Z
Loading
Overall Rating
  • Chocolate Supreme
  • Show More +
    Show Less -
User Image
Joanne C
Verified Buyer
I love this product, I have tried many different protein powders and this is my favorite.*
Was this helpful?
You found this not helpful
0 of 0 found this helpful
2024-04-22 13:36:47Z
Loading
Overall Rating
  • Chocolate Supreme
  • Show More +
    Show Less -
User Image
Joanne C
Verified Buyer
I love this product, I purchase it all the time. The flavor is delicious. *
Was this helpful?
You found this not helpful
0 of 0 found this helpful
2024-04-22 13:36:47Z
Loading
Overall Rating
  • Chocolate Supreme
  • Show More +
    Show Less -
User Image
Joanne C
Verified Buyer
I love this product, I have tried a lot of different proteins and this is my favorite.*
Was this helpful?
You found this not helpful
0 of 0 found this helpful
2024-04-10 16:06:10Z
Loading
Overall Rating
  • Chocolate Supreme
  • Show More +
    Show Less -
User Image
Imad A
Build Muscle
Verified Buyer
Very good preotein source, but very thick and heavy, i used while doing intermittent fasting to maintain my muscles*
Was this helpful?
You found this not helpful
0 of 0 found this helpful
2024-04-10 16:06:10Z
Loading
Overall Rating
  • Chocolate Supreme
  • Show More +
    Show Less -
User Image
Joanne C
Verified Buyer
I've tried different proteins and this is my favorite. Delicious flavor. *
Was this helpful?
You found this not helpful
0 of 0 found this helpful
2024-03-27 14:17:07Z
Loading
Overall Rating
  • Chocolate Supreme
  • Show More +
    Show Less -
User Image
Britney T
Increase Strength
Verified Buyer
Does not mix well at all. Flavor is okay. Consistency is ehh. *
Was this helpful?
You found this not helpful
0 of 0 found this helpful
2024-03-23 12:09:15Z
Loading
Overall Rating
  • Cookies & Cream
  • Show More +
    Show Less -
User Image
Michael K
Build Muscle
Verified Buyer
Price has gone up so much. However one of the casein proteins you can buy. Great taste too!*
Was this helpful?
You found this not helpful
0 of 0 found this helpful
2024-03-15 16:10:55Z
Loading
Loading
* 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.

Which products should we notify you about?


  • Loading product choices...
Text Message Alert
+1