Bladderwrack is a type of brown seaweed that grows along the coastlines of the Atlantic and Pacific Oceans, and the North and Baltic Seas. It has been used for centuries to treat an array of conditions. 4 oz. Loose Herbs Suggested Uses: For hot or cold tea, pour 8-12 oz of boiling water over 1 tsp. of herbs. Steep 3-4 min. Certified USDA Organic, Caffeine free. WARNING: Not to be used during pregnancy. Not to be used while nursing. Not for use in persons with hyperthyroidism. Naturally contains high levels of iodine. Consumption of this product may cause a serious or life-threatening reaction in persons with allergies to fish and shellfish.