Support your cardiovascular, bone, and thyroid health with Life Extension Vitamins D and K with Sea-Iodine, the best vegan vitamin D supplement on the market. The formula contains 5,000IY or 125mcg of vitamin D, 2,100 mcg of vitamin K and 1,000mcg of sea iodine. The perfect mixture of these three essential nutrients will improve your cognitive function, boost your immune system, inhibits calcium buildup in the arteries, and facilitate the production of thyroid hormones.