Iodine can actually be very good to regulate your thyroid and thus your hormone levels, and yes it does help blood clotting. I am currently following the diet "Eat Right For Your Blood Type" and if you have blood type O, you tend you have a lack of iodine which can actually cause weight gain, acne, fatigue, and blood related disorders. I take iodine drops every morning and I find that it has really helped to regulate my unstable thyroid and is helping to clear up my acne! But iodine works for blood type Os and it doesn't have the same affect on other blood types, it may even be harmful for other blood types (and thus cause acne!). Check out the book, "Eat Right for Your Blood Type" it's amazing! The author is Dr. Peter J. D'Adamo and you can check it out online at www.dadamo.com.