Whey is one of the two primary proteins found in dairy milk, making up about 20% of its protein content (the other 80% is casein). It is a byproduct of the cheesemaking process; when milk is coagulated, the liquid that remains is the whey. Once considered waste, scientists later discovered it was packed with high-quality protein and essential nutrients. The Three Main Types
It provides a quick, portable way to hit daily protein targets without the preparation time of whole food sources like chicken or fish. Bottom Line
Whey is considered a , meaning it contains all nine essential amino acids that the body cannot produce on its own. Most importantly, it is exceptionally high in Leucine , the most anabolic (growth-promoting) amino acid. Because it is water-soluble and rapidly digested, it reaches the muscles quickly, making it the perfect post-workout recovery tool to jumpstart muscle protein synthesis. More Than Just Muscle
It contains immunoglobulins and can boost levels of glutathione, the body's master antioxidant.
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Usually contains 70–80% protein, with some lactose and fat. It often has the best flavor.
Since "Whey all very" is still a bit ambiguous (perhaps you meant "They're all very... [good/bad/etc.]" or were referring to ), I have provided a brief, informative article on Whey Protein below, which is a popular topic in health and fitness.