Ocean’s Halo Seaweed Snacks come in easily consumable sheets and three flavors: Sea Salt, Texas BBQ and Sriracha. These snacks are an excellent source of vitamin B12 and iodine and are made with healthier oils and a lower sodium count than many other seaweed snacks. One of the most nutrient-dense plants on the planet, seaweed is a great source of vitamins A, B, C, E and K, as well as iodine, selenium, iron and calcium.