Yes, whey protein powder can be used effectively before bed if after a resistance training workout, but casein is a better choice if you have not had a workout.

Actually, whey protein powder can be very good for your hair! Hair is made of a very tough protein called keratin.

Yes, whey protein powder does lose its protein efficiency and expire, but it lasts a good long while when stored correctly.

The best whey protein powder for muscle building should contain a whey protein isolate as its main ingredient.

Most whey protein powders are very easy to digest, especially powders made with "whey isolate" or "whey hydrolysate".

Yes, whey protein powder is made from a milk byproduct of the cheese making process and is a complete protein with high levels of all essential amino acids.

Not all whey protein powders are lactose free. Cheaper, less efficient whey protein powders are made with whey concentrate and contain high lactose levels.

Whey protein powder is a dairy product made from cows milk and is suitable for vegetarians.

Whey protein is the protein found in the watery portion of milk that is separated from the curds during the cheese making process.

Unfortunately whey protein powder is not vegan, as it's a milk byproduct of the cheese making process.