The kelp we usually eat is the leafy part of the kelp, and the kelp root is the 3- to 6-centimeter section close to the root of the kelp that people usually eat. Kelp and kelp root are actually the same thing, just different parts. Kelp and kelp head have the effect of clearing away heat and resolving phlegm, relieving cough and calming the liver. Usually cold stir-fry or stewed with other ingredients can be flavorful and nutritious.