This article was reviewed by Craig Primack, MD, FACP, FAAP, FOMA. Whey, hemp, soy, casein — looking at different types of protein powder can get a little overwhelming. OK, a lot overwhelming. The good news is you can’t go too wrong. Protein itself is incredibly useful for hunger regulation, weight loss, and growing and maintaining muscle — and protein powder can help you get more of the macronutrient.