2, Undaria pinnatifida can not be eaten raw, Undaria pinnatifida is a kind of marine algae, containing bacteria and other substances that are not good for the body. It's easy to have diarrhea and abdominal pain if you eat it directly. Everyone should pay attention to their diet and cook Undaria pinnatifida before eating. Before cooking Undaria pinnatifida, we should also pay attention to the components in the mucus on Undaria pinnatifida, which are soluble in water. If you are not careful, these ingredients will be lost when washing.