B12 Deficiency, Thyroid Disease and The MTHFR Connection Dr Hagmeyer Hydroxocobalamin (Vitamin B12): Uses, Alternatives, Side Effects & More GoodRx Our bodies need vitamin B12 to maintain healthy red blood cells, nerves, and brain function. If a person has vitamin B12 deficiency (their body does not have enough vitamin B12), they can Help suggestions with BH thyroid test results Thyroid UK 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