Protein the key factor in bodybuilding

Proteins available in the market are whey proteins, casein proteins, egg proteins and soy protein powders.

WHEY protein powders:
Whey proteins are very soluble in fluids, which makes them easy to mix. Whey protein is digested and absorbed by the body very rapidly, the best protein to take before and after workouts, when its critical to supply muscles with ample amino acids.
Whey protein concentrate,  is usually manufactured via ultrafiltration processes. Most concentrate form contains 70 to 80% protein and small amount of carbs and fats. Concentrate protein has the slowest digestion among all available whey protein forms.
Whey protein isolate is processed through longer filtration or ion exchange methods.  Isolate products are more than 90% protein. Due to low carb and fat content, isolate whey is a slightly faster digesting protein than whey protein concentrate.
Whey protein hydrolysate is produced when whey isolate or whey concentrate form is taken through the extra step of hydrolysis to break the amino acid bonds.this makes it fastest digesting protein available. This is the best type of protein powder to use immediately after workouts.

Casein Protein Powders:
Casein proteins are insoluble in liquid and take longer to digest than whey or vegetable proteins; some forms take up to seven hours to fully digest. This means they provide a slow and steady release of amino acids to the body. These slow-digesting proteins are great for supplementing between meals and before bed whenever you won’t have a chance to eat for many hours.
Look for the following types of casein on the ingredients lists of protein powders.
Caseinate, Micellar casein, Hydrolyzed casein protein.

Egg protein:
When choosing egg-white protein powders, look for one or more of the following on the list of ingredients: egg protein, egg-white protein, egg-white solids and egg-white albumin.

Soy protein:
Soy concentrate (SC) SC is usually about 70% protein, with the rest being carbs and fat. It can cause gas in some people due to the indigestible carbs it often contains.
Soy isolate (SI) SI is made from soy concentrate that is further processed to remove most of the fat, carbs and gas-producing factors to provide a protein that is higher than 90% protein.

Now...what is the best way to use all of them:
Because all proteins have individual benefits, the best bet, if you can afford it, is to buy containers of whey, casein egg, soy protein powders. Use the blend one to two normal scoops first thing in the morning to stop the catabolism that has occurred during the night. You can also use this mix between meals when you know your next meal won’t be coming for several hours. Use hydrolysate or isolate whey protein 30-60 grams before and after workouts. Before bedtime, take casein powder 30-60 grams to provide a steady supply of amino acids to your body to prevent muscle protein breakdown while you’re asleep.
A cheaper option is a mixed protein powder that contains several different protein types. Be sure to get one that contains whey along with other proteins such as casein, egg or soy. These can be used at any time of the day to provide both fast- and slow-digesting proteins to supply amino acids in both a quick blast and steadily over several hours.