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ON Gold Standard 100% Casein 4lbs

$9999 CAD $12499
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Flavor

Product Description

ON Gold Standard 100% Casein 4lbs from Optimum Nutrition is a slow-digesting micellar casein protein powder, delivering 24g of protein per serving along with 500mg of calcium and 11mg of zinc. Available in a 4lbs size at Fuel Supplements, it's built for overnight or between-meal use when a slower-release protein fits your day better than a fast-digesting whey.

Key Benefits

  • 24g of micellar casein protein per serving for a slow-digesting protein source
  • 500mg calcium and 11mg zinc per serving
  • 1g total sugars with 0g added sugars per serving
  • Mixes into shakes with water or milk
  • Contains milk and soy; formulated with a gum blend for texture
  • 4lbs size from Optimum Nutrition's Gold Standard line

When to Use It

Because casein digests more slowly than whey, it's commonly used before bed or during longer stretches between meals, rather than immediately post-workout. Many lifters pair a fast whey like ON Gold Standard 100% Whey around training and save this casein for nighttime or as a between-meal shake to help round out daily protein intake.

FAQ

What makes casein different from whey protein?

Casein is a slower-digesting milk protein, which is why it's typically used before bed or between meals instead of right after a workout.

Does ON Gold Standard 100% Casein contain allergens?

Yes, it contains milk and soy. Always check the label on the specific flavour and size you purchase.

How much protein is in each serving?

Each serving provides 24g of protein, along with 500mg of calcium and 11mg of zinc.

Worth a read: Complete Buying Guide to Protein Powders in Canada (2026)

Directions and Suggested Use

Suggested Use

Mix about one scoop (33-34g) of the powder into 8-14 fluid ounces of cold water, milk, or other beverage. Stir, shake, or blend until dissolved.

Use 8-10 fluid ounces for a thicker consistency and 12-14 fluid ounces for a thinner consistency.

For best results, mix up your shake 30-60 minutes before bed, or have it anytime to boost your protein intake.

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.

Ingredients

Ingredients

Ingredients (Chocolate Peanut Butter shown; other flavours/sizes may vary — check product label): 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.

Contains: Milk and Soy.

Chocolate Peanut Butter

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%

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.

CONTAINS: MILK AND SOY.

Panels transcribed from each flavour's label — see the label photos in the product images. Other flavours/sizes may vary slightly.

Questions & Answers

How much protein is in ON Gold Standard 100% Casein?
Each serving of ON Gold Standard 100% Casein provides 24 g of protein from micellar casein, along with 120 calories and 1 g of total sugars.

What kind of protein is in ON Gold Standard 100% Casein?
It's built on micellar casein, a slow-digesting milk protein, which is why it's often used before bed rather than right after training.

Does ON Gold Standard 100% Casein contain allergens?
Yes, it contains milk and soy, and it's sweetened with acesulfame potassium and sucralose rather than added sugar.

Have a question?

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Why these go together

Casein digests slowly — most people run it at night alongside a faster whey for daytime and creatine for strength.

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