Kelp is low in calories and high in minerals. It is said that it contains 20 times more minerals, seven times more calcium and 35 times more iron than regular milk. When cooking, simply wipe the surface very gently with a wet cloth as the white power on the kelp is the source of its delicious taste. To keep kelp, cut into small pieces and store in an airtight container. There are a few types of kelp: