Protein consists of many different amino acids linked together. There are twenty different amino acid building blocks commonly found in plants and animals. A typical protein consists of 300 or more amino acids, and a specific number and sequence of amino acids are unique to each protein. What is Keto Whey Protein? Whey protein is one of two categories of protein found in dairy products (along with casein) and is a byproduct of cheese and yogurt production. After processing, whey protein is usually sold in powdered form or mixed into smoothies and powdered drinks that also contain other ingredients.