Food and Nutrition  Training and Exercise  Muscles and Anatomy  Fitness Dictionary  Supplements  Forums  Disclaimer	Casein Primary protein found in milk, along with whey protein. Casein is the insoluble protein fraction of milk. It is absorbed more slowly than whey and provides the body with amino acids over an extended period in comparison to whey protein, the soluble protein fraction in milk. Back to Glossary of Fitness Index.
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