If you’re a vegan or vegetarian, you still need complete proteins if you want to live a healthy life. Unfortunately, most plant-based proteins just aren’t complete. Soy protein is one of the few complete plant proteins available, but excess soy consumption can have negative side effects, so try not to go overboard with the soy protein. If you follow a vegan diet, especially if you are active, you should strongly consider investing in a plant-based protein supplement to ensure you are reaching your daily goals, and get a wide variety of protein sources to get your essential amino acids.