It would be ideal if you took both D3 and Iodine with co-supplements.
It takes 3 months to build up your D3 reserves, so take 10,000 IU vitamin D3 Geltabs made with olive oil, then get your inexpensive at home blood test. Adjust dosage up or down to achieve 70 to 80 ng/ml blood level. Each 1,000 IU will change the blood reading by 10 ng/ml. http://tinyurl.com/Vitamin-D-Report