How Much Vitamin B12 Should you Take for Your Thyroid? 7 Powerful Benefits of B12 Shots you Probably Didn't Know YouTube 7 Nutrient Deficiencies in Hashimoto's Dr. Izabella Wentz Today is my vitamin B12 injection day. If you have Hashimotos disease (like me), it's really important to keep your vitamin B12 at optimal. Optimal is not just over the threshold, its How Much Vitamin B12 Should you Take for Your Thyroid? 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