Vitamin A, AKA retinoic acid, is an essential fat soluble vitamin with multiple important functions in the body.

Eyes – vitamin A benefits eye health
Vitamin A helps in estrogen and testosterone metabolism. It is important for a healthy GI tract, healthy skin, and benefits eye sight.

Vitamin A functions to help thyroid hormone (T3) interact with the DNA to help improve metabolism.

With a vitamin A deficiency, thyroid medications can be less effective. It is important to ask your doctor to measure your vitamin A deficiency when you are taking thyroid medication.

Vitamin A deficiency can be caused by damage to the GI tract (especially from gluten) as well as gall bladder dysfunction, and poor dietary choices.