What is Casein?


Q. What is casein exactly?

A. Casein is the protein found in all mammals’ milk.  Mammals include cow, goat, sheep, yak, buffalo, camel and humans.  This includes human breast milk even if the mother is on a GFCFSF diet.


Q. Why can’t ASD children have casein?

A. Research shows that people with ASD have an abnormal immune response to the protein in casein (as well as the proteins in gluten and soy).  Whether or not your child tests positive on IgE or IgG tests to casein, it must be removed to be on the GFCFSF diet.


Q. What are the most common foods that contain casein?

A. The common foods are: milks, ice cream, sour cream, yogurt, butter, lunchmeats and cheese.


Q. Does it matter if the milk or butter is organic?

A.  No.  Casein is casein, organic or not and is therefore not allowed.


Q. What are the Kosher labeling rules for casein?

A.  A "D" on a label next to "K" or "U" indicates presence of milk protein


Q. Don’t kids need milk to grow?

A.   No, children need calcium to grow healthy teeth and bones, not dairy products.  You must give a separate calcium supplement.  Children need between 800-1200 mg of calcium per day and you can find it available in powder, chewables, liquid and pills.


Q. What are the most common ingredients that contain casein?


Artificial butter flavor
Butter fat
Butter oil
Casein (casein hydrosylate)
Caseinates (in all forms)
Condensed milk
Cottage cheese
Dry milk
Evaporated milk
Goat's milk
Half & Half
Hot dogs
Lactalbumin phosphate
Lactic acid starter culture (may contain milk)
Low fat Milk fat
Magnesium caseinate
Malted Milk Margarine
Milk (in all forms including condensed, derivative, dry, evaporated, goat’s milk, and milk for other animals, low-fat, malted, milkfat, non-fat, powder, protein, skimmed, solids, whole)
Milk cheese lactose
Milk powder
Milk protein
Milk solids
Naturlose (sweetener derived from whey)
Non-dairy creamer butter
Nonfat milk
Powdered Milk
Rennet casein
Skim milk
Sodium lactylate (may or may not contain casein)
Sour cream
Sour cream solids
Sour milk solids
Tagatose (sweetener derived from whey)
Whey in all forms (including sweet, delactosed, protein concentrate)
Whole milk


Ingredients which may contain milk protein flavorings:

  • Caramel coloring
  • Brown sugar flavoring
  • Bavarian cream flavoring
  • Coconut cream flavoring
  • Natural chocolate flavoring

*Please Note:
Lactic acid is found naturally in sour milk but also commercially produced from whey, cornstarch, potatoes and molasses. Therefore, if listed on a product as an ingredient, you must verify its source.


Q. What isn’t casein?

A. There are some ingredients that sound a lot like casein but aren’t.

  • Calcium lactate
  • Calcium stearoyl lactylate
  • Cocoa Butter
  • Cream of Tartar
  • Oleoresin
  • Sodium lactate
  • Sodium stearoyl lactylate