(HealthDay News) -- Vitamin D insufficiency is common among people with psoriatic arthritis, but levels of the vitamin in the blood do not affect disease activity, a new study finds.
People with psoriatic arthritis have the chronic skin disorder psoriasis accompanied by inflammatory arthritis.
The study, published in the July 11 issue of the journal Arthritis Care & Research, included more than 300 patients living in Toronto and Haifa, Israel, two geographically diverse locations. Vitamin D levels in the blood -- known as 25-hydroxyvitamin D [25 (OH) D] -- were measured in the summer and winter.
Vitamin D is produced by the skin in response to exposure to sunlight. It is also found in certain foods, including eggs, fish and fortified foods such as dairy products and breakfast cereals. Read more...
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