Protein is an essential nutrient for the body and is used in host of important functions such as the building of hair, skin, nails, internal organs, as well as muscle tissue. Protein is broken down as amino acids, which are building blocks of the body and are essential to muscle growth and repair.
The first thing to consider are the different forms of protein: Egg, Soy, and Milk. The latter being the most biologically available (most effective in creating new body tissue), therefore we will focus mainly milk protein.
Milk is comprised of about 20% whey protein and 80% casein. You can take either in supplement form, however they have both have different uses in a bodybuilder's diet.
Whey digests faster (40 minutes) therefore it is ideal to take when it is needed immediately, such as soon after a workout or cardio session. Casein digests relatively slowly (7 hours) therefore it wouldn't be of much use after a workout, casein protein can be used before bed to combat protein breakdown.
Whey itself can be broken down into two parts: Whey Concentrate and Whey Isolate.
The difference being concentrate is not a pure form of whey, it includes some lactose as well as some fat. Therefore if you suffer from lactose intolerance, you may want to steer clear of whey concentrate.
Whey isolate is a very pure form of whey, containing 95%-100% whey with no fat or lactose. This makes isolate a very popular option amongst gym-goers to take post-workout.
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