There are eight vitamins in the vitamin B complex family that are known as B1, B2, B3, B5, B6, B7, B9 and B12.Each of these vitamins plays essential roles in your health and deficiencies can lead to disease states that affect your overall health, such as hypothyroidism.oultry has vitamin B12, which is low in at least 40 percent of those with hypothyroidism.