Buying sea kelp depends on how you plan to use it, as it is sold in very different forms for eating, health supplements, or gardening. Sea Kelp Enhanced Iodine - 90 Capsules - Dr. Berg Shop our Dr. Berg store | Item # BER1032. ( 3 ) PureFormulas Sea Kelp with 200 mcg of Iodine, 250 Tablets (32292)