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5 Best Casein Protein Powders (2021 Updated) Buyer's Guide

Supplements Considered 17
Hours of Research 184
of Research
Reviews Examined 82
Experts Interviewed 8
Isaac Robertson
Published by Isaac Robertson
Fact checked by Donald Christman, BHSc FACT CHECKED
Last updated: December 3, 2021

"Little Miss Muffet sat on a tuffet eating her curds and whey."

Just about everyone has heard this age-old nursery rhyme though few know that "curds and whey" refer to the two primary types of milk-based proteins.

Whey-based protein powders can be seen on the shelves of most health food stores.

But "curds?" Chances are those same health food stores also stock curd powder. They just call it by its more proper scientific name "casein."

Unlike whey, casein is a slow digesting protein.

It gives it a kind of natural time-release mechanism which many people feel fits better with their nutritional needs. It’s also rich in amino acids and minerals, aside from other health benefits.

We’ve saved you the hassle of doing the research by listing the best casein protein powders below.

Our Top Casein Protein Powders (2021 Updated)

1 - Optimum Nutrition Gold Standard Casein (Editor's Choice)

Optimum Nutrition

Casein is considered by many a more useful form of protein than its cousin, whey.

That’s because of how slowly it is digested and the fact that it seems to improve overall colon health.

ON Gold Standard Casein Protein Powder is one of the top ways to get the nutrients you're after without having to put up with the GMOs present in other protein powders.

With Gold Standard, you get 24 grams of this micellar casein protein per serving along with only 120 calories, 540 mg calcium, and 220 mg potassium.

  • Made with 100% micellar casein
  • Mixes easily with water and milk
  • A more agreeable taste than most others
  • Low carb and easily digested
  • Has four flavors to choose from
  • Contains carrageenan to improve texture
  • Contains sucralose

There's also Aminogen® which helps promote optimal nutrient absorption.

However, they address the usual bland taste of these types of protein powders by including the artificial sweetener sucralose.

If you're looking for a way to bolster your workout results and build lean muscle, you should probably consider one of the four flavors of ON Gold Standard Casein Powder.

2 - BulkSupplements Casein Protein


BulkSupplements has built their reputation on delivering high-quality supplements at prices anyone can afford.

They keep costs down by minimizing packaging costs which is fine because a plastic tub isn't going to help with muscle growth. It's the contents that count.

BulkSupplements Casein Protein Powder is unflavored and mixes easily with your shakes and smoothies without ruining the taste.

It can also be combined with different types of batter to add a protein punch to your muffins and cakes.

This is absorbed much slower than whey which provides your system with an even flow of nutrients, including the amino acids necessary to produce lean, strong muscles.

You can conveniently check the amounts of amino acids per serving in the included amino acid profile.

  • 25 grams protein per serving
  • Mixes easily with water, milk or batter
  • Helps provide optimal benefits
  • More affordable than most competitors
  • The powder is super fine so it tends to go everywhere
  • Doesn't specify if the protein source is micellar casein

It's recommended to take BulkSupplements Casein Protein Powder shortly after working out to allow it to help with muscle growth and repair.

3 - Naked Casein

Naked Casein

Each serving of Naked Powder contains 5.5 grams of muscle building amino acids and BCAAs.

Beyond that, there’s nothing else to speak of because Naked has designed their powder to be the cleanest on the market.

They provide this vital nutrient in its purest form without artificial ingredients, additives or preservatives and free of genetically modified organisms.

Each serving delivers 27 grams of 100% pure micellar casein protein with minimal carbs. So if you’re on the keto diet to lose weight and build muscle, Naked Casein is an ideal choice.

  • Not much of any taste
  • Hard to mix with liquids

While it’s free of artificial flavors, sweeteners, and colorings, the chocolate flavor barely makes any taste.

Naked suggests the best time to take casein protein powder is before bed as it will help optimize your workout results even while you sleep.

4 - Dymatize Elite Casein Protein Powder

Dymatize product

This product from Dymatize helps supply your muscles with a full day’s worth of muscle buildinh BCAAs so your body can build and repair muscle tissue around the clock.

Casein is a type of protein is derived from milk and is the more bountiful of the two primary milk proteins (whey being the other) with many believing it to be the more useful.

Oftentimes, hours after a strenuous workout, any whey-based protein product you might have taken is long spent.

However, at the same time, your muscles still crave the protein and BCAAs in your protein powder to help with muscle protein synthesis.

This is where casein shines as it helps delivers that protein your muscles are craving, thereby allowing you to obtain the optimum benefits from your workout efforts.

  • 100% micellar casein protein powder
  • 25 grams of protein per serving
  • Five different flavors to keep things interesting
  • Mixes easily with both water and milk
  • Tends to mix heavy so don’t use too much

Each serving of Dymatize Elite provides 5.3 grams of BCAAs (branched chain amino acids) as well as 25 grams of micellar casein protein.

5 - Six Star Pro Nutrition Casein Protein

Six Star

Six Star Casein Powder provides 24 grams of long-lasting, easily digestible protein per serving for active men and women, bodybuilders, athletes, and CrossFit enthusiasts.

It is made in a purified form that's combined with calcium and iron to produce a supplement that works.

It's also virtually free of fat and low in carbs, but contains BCAAs and amino acids your body needs in the hours following a strenuous workout.

While it does contain 1 gram of sugar to improve taste, it's gluten-free and low in cholesterol.

  • Maybe the best tasting powder
  • High-quality drink for a better physique
  • 100% gluten free with only 9 grams of carbs
  • 24 grams of protein per serving
  • Uses casein and whey blend
  • Doesn't dissolve well using a shaker

While Six Star Casein Protein is easily absorbed by the digestive tract and slow to release, it doesn't seem to dissolve well using a shaker.

What is Casein Protein?

curds with casein

Casein is one of the two primary types of milk protein with whey being the other.

It commonly takes on the appearance of "curds" or milk globules.

Curds are traditionally used in cheese, yogurts, and a variety of other foods.

Today, however, they are recognized for providing a type of protein that is very slow to digest and has outstanding muscle building and repair properties. [1]


Well, the main feature that makes casein special is how it forms a kind of gel or clot when in the stomach, making it perfect at providing a gradual release of nutrients such as amino acids into the bloodstream. This naturally makes it perfect for both long workouts and recovery.

- Chris Hanson, Fitness Guru

When to Take Casein and How Much?

When to drink casein is up to the person taking it, but most people take this before bed - particularly so if they have engaged in a strenuous workout that afternoon or evening.

While you sleep, it will work to repair damaged muscle tissues and build new, stronger, leaner muscles in its place.

When it comes to how much organic casein most people take before bed, a standard serving of this powder is just as they would at any other time.


What are the Benefits?

smiliing fit woman

It is also known to have many benefits.

But without a doubt, its most sought-after benefit is its ability to provide a measured, evenly spaced release of protein into your system over the course of many hours.

It also helps improve your metabolic rate which aids in weight loss efforts to bolster dental health and yield greater muscle mass through the BCAAs, essential amino acids, and other nutrients.

Some preliminary studies have found that casein can have other impressive benefits, including antibacterial and immune benefits, reducing triglyceride levels, free radicals, and fat.

- Rudy Mawer, MSc, Healthline

Are There Any Side Effects?

Any side effects resulting from the use of casein protein typically have to do with people who are lactose intolerant unknowingly using the supplement.

Since it is derived from cow’s milk (like whey powder), those who are unable to tolerate dairy products are going to experience a reaction if they take this type of protein.

Whey vs. Casein Protein

scoop of whey protein powders

While both organic casein and whey proteins do an outstanding job helping you build lean muscle, with its easy digestibility and time release properties, casein is preferred by many athletes and bodybuilders.

The fact that it has the added benefit of making many people feel full longer which helps stave off cravings that can lead to binge snacking and conditioning setbacks. [2]

But if what you want is a slow, steady climb toward a stronger, leaner physique, then it may well do a better job.

Now, let's find out which brand deserves the number one spot on our list of the best casein protein powders.

What to Look for in Casein Protein Powders

Form of Casein Protein

There are two forms of casein protein: micellar casein and casein hydrolysate. And the best casein protein is the slow-digesting and slow-release form which is the micellar casein compared to the rapid-absorbing hydrolysate.

Protein Content

You asked for protein so you obviously want to get as much protein out of one serving of a protein powder. But it still depends on your fitness goal.

If you want to bulk up, choose one with a higher protein and calorie contents, regardless of fat and carb content.

But if you're taking a casein powder to lose weight, you want to go for one that has a fair amount of protein with as little carbs and fat as possible.

In either case, aim for 20 to 28 grams of protein per serving to get your desired results. The best casein protein powder has a maximum of 150 calories per serving while having the ideal amounts of carbs, fat, and protein intake for your goals.


While the main ingredient of casein protein powders is casein (duh), some are nutritionally better as they provide BCAAs, essential amino acids, vitamins, and minerals which help with muscle building and weight loss efforts.

It's always best to stay away from protein powders with artificial ingredients like sweeteners, flavors, and colorings. And let's not forget to check for the added sugar content. It can easily add up with every scoop.

Taste & Flavor Range

It's pretty hard to find a delicious protein powder to mix with your workout shake that's not loaded with sugars and artificial flavors.

Some people prefer unflavored protein powders just to avoid the artificial ingredients, but your taste buds might not agree. Fortunately, there are naturally-flavored casein protein powders available in the market, just like the one from Naked.

But if you're good with the taste of your current juice or smoothie, then consider to mix an unflavored casein powder.

Little Miss Muffet may not have been a bodybuilder, but the fact that she ate her casein protein (curds) meant that she had plenty of energy to leave that spider in the dust.

If you're looking for a better way to optimize your efforts in the gym this type of protein will provide it.

Among all the best casein protein powders profiled above, ON Gold Standard Casein Powder is the more likely choice in the list.

And through our in-depth research, we found that many other ON users have also reported achieving the same positive results from using the product. With 24 grams of 100% micellar casein protein, they have claimed that this product may have improved their muscle building capabilities while on it.

We think you'll agree on this review that ON Casein Powder with its low-calorie, low-carb, and high-BCAA content is the most reliable way to achieve your weight loss, conditioning, and muscle building goals.

Our #1 Casein Protein Powder

Optimum Nutrition Gold Standard Casein

Optimum Nutrition
Protein per Serving
Ingredient Quality
Overall Score 4.9
  • Made with 100% micellar casein
  • Mixes easily with water and milk
  • A more agreeable taste than most others
  • Low carb and easily digested
  • Has four flavors to choose from
  • Contains carrageenan to improve texture
  • Contains sucralose

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One thought on “What’s the Best Casein Protein Powder?
Reviews & Buyer’s Guide

  1. I appreciate you guys sharing this. Been using Optimum Nutrition for 4 months and all I can say is wow. It’s truly the best casein protein powder with high quality ingredients and slow digesting effect. It’s the best tasting too, I should say.

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