Constituents of Kelp Powder Iodine, Calcium, Iron, Potassium, Vitamin B1, B2, B12 and polysaccharides. Parts Used in Kelp Powder Powdered whole kelp plant, which has been sun dried, cleaned and processed. Typical preparations for Kelp Powder Powdered kelp can be easily included in practically every dish. You may sprinkle it on entrées, soups, salads, and it makes a marvellous drink in the form of a "green smoothie". Also adds well in teas and in iced drinks. Daily Dose 1-2 teaspoon is fine to increase your iodine intake and get some of the benefits that seaweed has to offer. Precautions While Kelp may be used liberally, overuse is not recommended because of the danger of triggering Hyperthyroidism.