Casein protein
Why?: This is great if you use protein powder to replace a meal or before bed. You can also use it to combine with whey for muscle-building.
Casein is the essential protein in milk and is absorbed slower than whey, so it’s not quite as effective at building muscle. But it can leave you feeling fuller for longer periods, which makes it an excellent addition to meal replacement shakes or even your morning oatmeal, especially if weight loss is a concern.