Soy protein isolate strips away most of the fat and carbohydrates from soy, leaving a powder that is about 90% protein. People reach for it after resistance training to support muscle repair and growth. Vegetarians and vegans often use it as a straightforward protein source. You can shake it into water or plant milk as a post-workout drink or meal replacement.
Some people notice mild digestive discomfort with it. If you take thyroid medication, soy protein isolate can interfere with absorption when taken too close to your dose. Spread them apart by several hours.