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A 2010 study reviewed blood work of 117 out-patient psychiatric subjects in Sweden. The researchers measured the patients’ serum vitamin D and parathyroid levels. Patients diagnosed with ADHD had much lower than normal levels of parathyroid hormone. The researchers also found that having a diagnosis of autism spectrum disorder or schizophrenia predicted low levels of serum vitamin D. It is suspected that in both autism and schizophrenia, vitamin D deficiency may not only be a predisposing developmental factor but also relate to the adult patients’ psychiatric state. This was further supported when some patients with vitamin D deficiency underwent vitamin D treatment experienced an improved psychiatric state. (Humble MB, Gustafsson S, Bejerot S. Low serum levels of 25-hydroxyvitamin D (25-OHD) among psychiatric out-patients in Sweden: Relations with season, age, ethnic origin and psychiatric diagnosis. J Steriod Biochem Mol Biol. Mar2010.)