Sourced in Tasmania, raw kelp contains notable amounts of iron, manganese, calcium, magnesium, iodine, copper, zinc, riboflavin, niacin, thiamin, vitamins A, B12, B6 & C. These vitamins are essential for cellular metabolism, to help maintain strong bones and for muscle function. Note: This product is high in iodine. Our kelp contains 500mcg/g iodine. There's a daily recommended requirement of 150mcg. There is 3.6g of kelp in a teaspoon. 0.5% of that is iodine, @ 180mcg iodine/tsp So please note, a little less than a teaspoon of kelp is enough to meet your recommended daily intake of iodine.