The current US Department of Agriculture (USDA) Recommended Daily Allowance (RDA) for iodine is 150 mcg for adolescents and adults. Why do so many in the iodine community, including health professionals, take 12.5 mg or more which is 87 times the USDA RDA? Iodine is an essential component of total body health. The Zen Haus Dual Form Iodine Supplement is labelled 'High Potency' because it provides 12.5 mg of elemental iodine.