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In fact, one animal study found that fucans extracted from seaweed prevented blood clotting as effectively as an anti-clotting drug ( 45). The largest seaweed-producing countries are China, Indonesia, and the South Korea. Other notable producers include Philippines, North Korea, Japan, Malaysia, and Zanzibar ( Tanzania). [22] Seaweed farming has frequently been developed to improve economic conditions and to reduce fishing pressure. [23] Antioxidants can make unstable substances in your body called free radicals less reactive ( 18, 19).
Seaweed is an excellent source of iodine, a vital trace mineral that plays a critical role in thyroid health. The body doesn’t make iodine on its own, so you need to get it from food sources or supplements.
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One animal study found that rats who consumed fucoxanthin lost weight, whereas rats who consumed the control diet did not. Rotting seaweed is a potent source of hydrogen sulfide, a highly toxic gas, and has been implicated in some incidents of apparent hydrogen-sulphide poisoning. [53] It can cause vomiting and diarrhea. Several other animal studies have reported improved blood sugar control when seaweed extracts are added to the diet ( 54, 55, 56). Summary
Duarte, Carlos M.; Wu, Jiaping; Xiao, Xi; Bruhn, Annette; Krause-Jensen, Dorte (2017). "Can Seaweed Farming Play a Role in Climate Change Mitigation and Adaptation?". Frontiers in Marine Science. 4. doi: 10.3389/fmars.2017.00100. ISSN 2296-7745.
May interfere with certain medications. Seaweed contains a high amount of potassium, which can be harmful to individuals with kidney disease. Seaweed also contains vitamin K, which could interfere with blood-thinning medications such as Warfarin. Seaweed also contains an amino acid called tyrosine, which is used alongside iodine to make two key hormones that help the thyroid gland do its job properly ( 9). Summary Journal of Applied Phycology: “The Consumption of Seaweed as a Protective Factor in the Etiology of Breast Cancer: Proof of Principle.”