Whey Vs. Casein Protein: Which One Is Better?

One of the questions we get asked on a weekly basis, is what’s the difference between Whey vs Casein protein? Both whey and casein are a derivative of cow’s milk. However, both offer slightly different benefits, dependent upon your athletic aspirations and fitness goals. We’re going to get into the benefits, differences, and uses of whey vs casein. 

In this article, you will learn

  • What is Whey Protein?
  • What Are The Benefits Of Whey Protein?
  • What is Casein Protein?
  • What Are The Benefits Of Casein Protein?
  • What’s The Difference Between Whey Vs. Casein?
  • When Should I Take Whey Protein Vs. Casein Protein?
  • Which One Is Better Whey Vs. Casein? 

What Is Whey Protein?

Whey protein is a complete source of high-quality protein derived from milk. Whey protein has a very high concentration of branched chain amino acids, especially leucine which is responsible for building and rebuilding lean muscle mass.

Whey can come in a variety of different forms, namely isolate and hydroylsate. The difference between Whey, Whey Isolate, and Hydrolysate is that whey protein concentrate is composed of 70-80% pure protein and contains over 50% lactose, with a higher content of fat and carbohydrates, as compared to whey protein isolate and hydrolysate.

REALTED ARTICLE Whey Vs Whey Isolate: What Type Of Whey Protein Is The Best?

What Are The Benefits Of Whey Protein?

One of the many benefits of whey protein as compared to casein is its fast absorption rate and bioavailability. Whey has a high concentration of amino acids, especially the branched chain amino acids, which are responsible for protein synthesis or the muscle building process. [R].

RELATED ARTICLE What Are The Benefits Of BCAAs?

By consuming whey protein post workout, you will obtain a positive amino acid balance, which will help benefit strength, building lean muscle mass, body composition, and fat loss.

RELATED ARTICLE Why Whey Protein Isolate Is The Best Type Of Whey 

Whey is a great source of protein to ingest immediately post workout, to help with rebuilding lean muscle mass and faster workout recovery.

RELATED ARTICLE Post Workout Nutrition: What To Eat After Your Workout For The Best Results

What Is Casein Protein?

Casein protein is found and derived from milk. When a coagulant is added to milk, the whey and the casein separate, leaving two distinct forms of protein. Casein protein has a much thicker consistency and moves through the gastrointestinal tract more slowly providing a long-sustained release of amino acids also referred to as the ‘amino-acid drip’. This is why casein is marketed to be consumed before bed, so that you can get an overnight supply of amino acids, to increase the anabolic process of muscle protein synthesis and build more muscle mass and strength [R].

What Are The Benefits Of Casein Protein?

According to a study published in The Journal Of the International Society Of Sports Nutrition, thirteen males participated in a 10-week exercise and dietary intervention while receiving 35 g casein daily. The study found that casein benefits an increase in building lean muscle mass (hypertrophy) and increases in strength, much like whey protein.

Therefore, much like whey protein, casein benefits increases in strength, building lean muscle mass, and optimizing body composition through sustained amino acid delivery.

What’s The Difference Between Whey Vs. Casein Protein?

A single glass of milk contains around 80% casein and 20% whey. If you were to let milk coagulate, casein would be the curd, while whey would be the liquid. This should give you an idea of the differences between how whey and casein are absorbed, which leads us into the main difference between whey and casein – absorption rate.

The biggest difference between whey vs. casein protein, is the absorption rate. Casein and Whey are both very rich sources of protein and essential amino acids, which helps build and rebuild lean muscle mass.

Whats the difference between casein and whey

According to a study, which examined the differences between whey vs. casein pre and post workout, the results indicated that there were no significant differences between whey vs. casein in regards to performance. Both groups experienced significant improvements in body composition, strength, and anaerobic performance when consuming either protein supplement pre- and post-exercise. However, no significant effects were observed between groups in changes in any variable [R].

When Should I Take Whey Protein Vs. Casein Protein?

Whey protein should be taken immediately after your workout, to provide a fast absorbing protein source, rich of amino acids to initiate the muscle rebuilding process. Protein however can be taken at any time of the day, to help you meet your macro goals, as well as be used as meals or snacks throughout the day.

If you’re looking for an amazing protein supplement, I would recommend using Swolverine’s Whey Isolate.

Swolverine’s Whey Isolate has 27g of pure whey isolate per 29g scoop, giving it the highest ratio of protein per serving on the market at 90% purity. Not to mention, its amazingly delicious and made from the happiest grass-fed cows in America, free from rBGH or recombinant bovine hormones.

RECOMMENDED PRODUCT Whey Isolate (30 Servings, Vanilla/Chocolate)

With a much slower absorption time, it’s recommended to take casein before bed. This will ensure a slow, sustained amino acid delivery, which will slow the rate of protein breakdown. Peak amino acid delivery will occur 3-4 hours after ingesting casein, and can take up to 7 hours to completely absorb. 

Which One Is Better Whey Vs. Casein?

Although both whey and casein protein are derived from dairy and have a high amino acid content, whey is considered to be more anabolic due to it’s rapid digestion. Yet despite this fact, studies suggest that even though whey initiates muscle protein synthesis faster than casein, there is no difference between performance indicators and body composition.

Both casein and whey are great sources of protein that can help improve athletic performance, increase strength, and optimize exercise recovery. Therefore, choosing one over the other won’t produce significantly different results. Supplementing whey or casein is extremely beneficial to your overall athletic performance, however more studies comparing the consumption of whey vs casein protein pre- and post-exercise are needed to further determine if and/or how the two protein types differ in promoting hypertrophy and improving anaerobic performance.

Are you looking for a protein supplement to help you increase your gains?

Our rich and creamy Whey Protein Isolate is packed with 27 grams of ultra pure cold-pressed, micro-filtered Whey Protein Isolate per serving. Sourced from the happiest grass-fed cows in America free of rBGH (recombinant bovine growth hormone), our Whey Protein Isolate is loaded with the building blocks you need, to build your athletic performance and strength. We'll turn your post-workout shake into the most exciting part of your workout. 


Joy, Jordan M et al. “Daytime and nighttime casein supplements similarly increase muscle size and strength in response to resistance training earlier in the day: a preliminary investigation.” Journal of the International Society of Sports Nutrition 15,1 24. 15 May. 2018, doi:10.1186/s12970-018-0228-9

Volek JS, Volk BM, Gómez AL, et al. Whey protein supplementation during resistance training augments lean body mass. J Am Coll Nutr. 2013;32(2):122-35.

Wilborn, Colin D et al. “The Effects of Pre- and Post-Exercise Whey vs. Casein Protein Consumption on Body Composition and Performance Measures in Collegiate Female Athletes.” Journal of sports science & medicine 12,1 74-9. 1 Mar. 2013

Wolfe, R. R. (2001). Control of muscle protein breakdown: effects of activity and nutritional statesInternational Journal of Sport Nutrition and Exercise Metabolism, 11(s1), S164-S169.

Miller, S. L., Tipton, K. D., Chinkes, D. L., Wolf, S. E., & Wolfe, R. R. (2003). Independent and combined effects of amino acids and glucose after resistance exerciseMedicine & Science in Sports & Exercise, 35(3), 449-455.

Dangin, M., Boirie, Y., Garcia-Rodenas, C., Gachon, P., Fauquant, J., Callier, P., ... & Beaufrère, B. (2001). The digestion rate of protein is an independent regulating factor of postprandial protein retentionAmerican Journal of Physiology-Endocrinology And Metabolism, 280(2), E340-E348.

Tipton, K. D., Elliott, T. A., Cree, M. G., Wolf, S. E., Sanford, A. P., & Wolfe, R. R. (2004). Ingestion of casein and whey proteins result in muscle anabolism after resistance exerciseMedicine & Science in Sports & Exercise, 36(12), 2073-2081. 

NutritionProteinWheyWhey concentrateWhey protein isolate

Join Over 50,000 Fans

Get exclusive access to discounts and the latest on fitness, nutrition, and wellness

Free domestic shipping

Spend $150 and your shipping is on us

60 Day Money Back Guarantee

If you're not satisfied we're not satisfied

Top-notch support

We're committed to an amazing customer experience

Secure payments

Your payment information is encrypted and never compromised