Andrew L. Stoll, M.D in his book “The Omega-3 Connection” he recommends not consuming more than 2 to 3 Tbsp. of flaxseed or flaxmeal per day because the seed husks contain naturally occurring cyanogenic nitrates and linamarin, which can be toxic in higher doses. The cyanogenic nitrates interfere with the thyroid gland’s ability to take up Iodine and may lead to goiter or other thyroid problems. Immature seeds contain higher amounts of cyanogenic nitrates and glucosides and are more dangerous.