More blood results (prior to b12 injections) : r B12_Deficiency Hydroxocobalamin Injection: Vitamin B12 for Energy & Anemia 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 Deficiency, Thyroid Disease and The MTHFR Connection Dr Hagmeyer 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 Vitamin B12 shots: Uses, benefits, and side effects