How many essential amino acids are commonly found in milk proteins?

The correct number of essential amino acids commonly found in milk proteins is 10, not 12, 19, or 22. Essential amino acids are those that cannot be synthesized by the body and must be obtained through the diet. The amino acids that are considered essential include histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine, alongside arginine for young children.

Milk proteins, such as casein and whey, contain a high-quality mixture of these essential amino acids, making milk a valuable dietary source for individuals needing to meet their amino acid requirements. While some options suggest higher numbers, the standard for essential amino acids is established at 9 for adults, with arginine being conditionally essential particularly for infants. Thus, milk proteins provide a comprehensive profile of these essential amino acids.