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Deficiency in vitamin D has been widely regarded as contributing to autoimmune disease, but a review appearing in Autoimmunity Reviews explains that low levels of vitamin D in patients with autoimmune disease may be a result rather than a cause of disease and that supplementing with vitamin D may actually exacerbate autoimmune disease.
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If it's true, my guess is that the true cause of autoimmunity in these cases might be vitamin A deficiency. Since vitamin D makes the body use vitamin A, adding vitamin D exacerbates the problem by deepening the vitamin A deficiency.
The mechanism might be that vitamin A deficiency atrophies the adrenal glands, who have the role of secreting cortisone. Cortisone regulates the immune system.
All these imply that a high level of vitamin D without adequate vitamin A could be dangerous.