100% Micellar Casein

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Slow-Release Micellar Casein Formula

Even in our fast-paced world, there are times when it pays to slow down. Take between meals and bedtime for example. During these occasions you want a protein that takes its time. Something to hold you over until your next meal. A protein that breaks down more slowly, delivering its amino acids over several hours. R1 Casein is what you’re after.

  • ZERO Non-Casein Proteins
  • ZERO Creamers
  • ZERO Spiking
  • ZERO Fillers


Slow-Release Micellar Casein Formula

  • 25 g slow-release protein*
  • Premium micellar casein
  • Amino acid delivery for up to 8 hours.
  • Thick satisfying texture.
  • Naturally-rich in all essential amino acids (EAAs) u
  • Carefully blended and packaged in an NSF GMP facility in the USA

* Per serving. u Amino acids are naturally occurring and approximated.


Tasty Shakes: Mix one heaping scoop if R1 Casein™ with approx. 10-12 of water, milk or your favorite beverage in a shaker cup or glass with a spoon.

Juice Smoothies: Add your favorite fruit and ice to the above, mix in blender and enjoy!

Allergen Information

contains Milk, Soy and Wheat.

Vanilla Creme
What is the difference between whey and casein?
Both whey and casein are highly nutritious proteins derived from milk. Whey proteins have a thin consistency and are rapidly digested and absorbed, which makes whey beneficial around workouts. Casein proteins are thicker and take longer to be broken down. Casein tends to be more filling than whey and is commonly used at night or between meals.
When are the best times to use R1 Casein?
s a slower digesting protein R1 Casein works well between meals and at bedtime when more sustained amino acid delivery is desired.
Is R1 Casein a good substitute for R1 Protein or R1 Whey Blend?
R1 Casein works best in conjunction with a fast acting source like R1 Protein or R1 Whey Blend. Use R1 Protein or R1 Blend during the day and take R1 Casein before going to bed to help feed your muscles while you sleep.

1 Review

  • 5

    My New #1

    Posted by joeper on Aug 1st 2017

    I've tried a few different casein powders and Rule 1 by far is the best. Great taste and mixes well. I currently have the chocolate peanut butter flavor and no other product in my opinion beats the taste.