Colostrum is the first milk given to a newborn calf by its mother, and contains proteins including immunoglobulins, or antibodies, that may not be present in ordinary milk. Colostrum is normally secreted only in the first 48 to 72 hours after birth. Source Naturals Colostrum is true bovine colostrum (not cheese whey), collected within the first 12 hours of production. It is then standarIngredients:Supplement Facts Serving Size: 1 Level Teaspoon (approx. 2 grams) Amount Per Serving%DVCalories10 Cholesterol2 mgTotal Carbohydrate1 gSugars1 g Protein1 g2%Standardized Bovine Colostrum (dried) Yielding 600 mg of naturally occurring immunoglobulins (proteins)2 g