Cyanocobalamin (B12) Products American Regent Symptoms of vitamin b12 deficiency. Studies show that low levels of vitamin b12 may be more common in people with hypothyroidism. Vitamin b12 is also involved in making and metabolizing thyroid B12 Injections Naturopath Ottawa Dr. Noah Litvak Enhance Your Wellness Today Dr. Noah Litvak, ND How Much Vitamin B12 Should you Take for Your Thyroid? HASHIMOTO'S THYROIDITIS What is Hashimoto's thyroiditis? Hashimoto's thyroiditis is an autoimmune condition in which the immune system attacks the thyroid gland. Over time, this can damage the thyroid and