Hello, generally, our friends who have finished fitness or are thin and need to gain weight need protein powder to supplement their needs. The main purpose of protein powder is to supplement protein and collagen powder urgently needed by human body and restore the elasticity of our skin. When we exercise, the best supplement is soybean protein or whey protein powder. On the one hand, it contains the ingredients of eggs and has high nutritional value. What kind of protein powder is good for fitness depends on what kind of protein powder is suitable for us.