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      News — casein

      Ingredients vs. Claims Vol. 2: Casein

      Ingredients vs. Claims Vol. 2:  Casein

      Ingredients vs. Claims Vol. 2: Casein
      Written by American Gainz Nutrition

      At American Gainz Nutrition, we believe Casein proteins are the keystones to achieving GAINZ, and thus created a short Q&A to best share the information.


      1.  What is the role Casein plays in milk’s nutritional value?

      A two-month old calf will drink an average of eight liters of milk per day.   In less than 15 months, this cow will tip the scale at ~ 2,400 lbs. Likewise, a human baby will have tripled his/her body weight in the first six months just by drinking milk. So the purpose of milk seems clear - growth & development.

      But what is it about milk that promotes this type of growth? Most athletes are under the impression that the whey protein in milk is what contributes to growth, when in fact, cow milk protein is nearly 80% Casein and only 20% Whey. The majority of Gainz from milk comes from casein protein.  

      2.  Why aren’t there more Casein Protein powders marketed to Athletes?

      The easiest answer is money. It costs more. Extracting Micellar Casein protein can only occur at the sacrifice of the cheese making process as it involves extracting protein directly from the milk. Whey protein, on the other hand, is separated from the curds and drained as part of the cheese manufacturing process, leaving the cheese unaffected. It’s often described as a byproduct of cheese manufacturing.

      Whey protein is also naturally sweeter. This is because the lactose (simple sugar) stays with the whey when it is separated from the curds which explains why it is very difficult to find a whey protein concentrate that does not contain lactose and Casein is often labeled as 100% lactose free.

      3.  Why is Casein considered a slower digesting protein relative to whey?

      Casein is incredibly sticky. It is slower digesting because of its gel forming properties, which literally slows down intestinal motility.  Casein protein is also highly digestible relative to whey protein. This is why whey protein can sometimes stimulate a localized intestinal response often attributed to “milk allergies” when really, it’s due to an inability of a portion of the protein to be broken down.

      As performance athletes, we need slow amino acid release as numerous studies have proven this pattern to be the most powerful at promoting an anti-catabolic environment for muscle growth. The fact is, you grow and recover the most while sleeping.

      4.  What does “Micellar” mean when referring to Casein?

      Micellar casein refers to the molecular structure of the protein being intact and therefore containing the peptides in their natural form (undenatured). To retain an abundance of micellar protein during processing, a specialized treatment of the milk has to be performed which sacrifices the ability to make cheese, thereby making the process very expensive.

      Because the casein micelle is in suspension, it can be separated from the rest of the milk through centrifugation at a very high speed. Utilizing ultrafiltration or microfiltration along with avoiding exposure to heat, acid or other chemicals, the micellar casein structure will remain intact. Thus, more bioactive peptides, with immuno- and growth-modulating effects, are present in the protein. Gainz!!!

      5.  What is the general process difference for Whey Protein vs. Micellar Casein Protein?


      1. Milk – Collected from cows
      2. Standardization – The milk is pasteurized
      3. Culture & Coagulant – Bacteria used to trigger coagulation
      4. Cutting – Liquid whey & curds are separated
      5. Whey Draining – Whey is drained, leaving the solids behind called curds
      6. Whey is dehydrated and considered WPC (Whey protein concentrate) 20% Fat & Lactose

      Micellar Casein (undenatured)

      1. Milk – Collected from cows
      2. Standardization – The milk is pasteurized
      3. Centrifugation – The intact Casein Micellar structures are extracted and dehydrated

      In closing, both casein and whey proteins, if utilized correctly, are an amazing performance combo added to any fitness regime - whey to spike the blood with instant amino acids and casein to keep the BCAAs flowing!!! For questions regarding general industry information or our products, contact us at