Lactose is removed or broken down to make lactose-free milk for people who can’t tolerate regular milk—usually because their body doesn’t have enough lactase to break down lactose in dairy products.

Whey and plant proteins help build muscle. Whey is a complete protein that is easily absorbed, while plant protein is lactose ...

Protein powders can sometimes cause digestive issues, so we asked experts what to look for if you have a sensitive stomach.