For accessibility related questions, please contact us or visit our Accessibility Statement.
Skip to content Skip to navigation
Free delivery for orders over $75
15% off your first order when you sign up to our newsletter

GOLD STANDARD® 100% Casein

  • Supports muscle recovery at nighttime & between meals
  • 24g protein per serving
  • 100% of the protein from micellar casein
  • Slow digesting protein (when compared to whey protein)
  • 9g EAAs per serving⁶
  • Excellent source of magnesium & zinc

Product Overview

Recognized as one of the First 100% Micellar Casein Protein Powder

GOLD STANDARD 100% Casein supports muscle recovery during nighttime and between meals with 24g of premium micellar casein protein.
Micellar casein protein is derived from milk and digests slower than whey protein. The result is a protein option that allows your body to absorb protein and amino acids over longer periods of time when eating is not possible or practical – such as during sleep or between meals. It’s an excellent option for anyone who wants quality, slow-release protein and essential amino acids in their performance nutrition routine – from fitness enthusiasts to elite professional athletes and every level between.
With four great-tasting flavor options, satisfying texture, and easy mixing with only a glass and spoon, you’ll always look forward to getting the protein you want in your active, performance-driven lifestyle. It’s everything you’ve come to expect from OPTIMUM NUTRITION®: The World’s #1 Sports Nutrition Brand⁴.


  • 24g of 100% micellar casein protein per serving to support muscle recovery at nighttime & between meals
  • Slow-digesting protein (compared to whey) for times you go without food – such as during sleep or between meals
  • 9g of naturally occurring essential amino acids (EAAs) to support muscle recovery
  • Excellent source of magnesium (85mg) & zinc (11mg) in each serving
  • 0.5-1 gram of fat and 1-2 grams of sugar per serving to help you easily stay on track with nutrient goals
  • Banned substance tested
  • Easy mixing with only a glass and spoon
  • Four great-tasting flavors

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.

Nutritional Information

Nutritional information will be shown when a flavour and/or size is selected.

Sign up for weekly offers, news and advice

Plus 15% off your first order