Soy protein is a common staple in the diets of vegetarians, vegans, and those that are lactose intolerant.
Soy is the best vegetable protein available on the market today. It is available in a variety of flavours and forms for convenience.
Soy also contains compounds called flavonoids that have anti-oxidant like properties. This is an added benefit of using a Soy protein over a Whey.
For those who are lactose intolerant there are plenty of Whey protein powders that are 100% or virtually lactose free, so there are alternatives to Soy if that is your sole reason for choosing it.
Soy is excellent in baking and is great to add into smoothies.