While vitamin D deficiency does not initiate the process of autoimmunity in which the body’s immune system wages an attack on an organ such as the thyroid, skin, pancreas, or joints, it plays a
“permissive” role, i..e, vitamin D deficiency allows some other factor to initiate the process.

For this reason, getting your vitamin D blood level into an ideal range provides great advantage in preventing autoimmunity or in helping you reverse it.