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Research does seem to show a link between low levels of vitamin D in the blood and symptoms of depression. However, research hasnât yet shown clearly whether low vitamin D levels cause depression, or whether low vitamin D levels develop because someone is depressed.here are a number of good research studies from the last few years that look specifically at vitamin D and depression. In a review of research about vitamin D and depression in 2013, 9 researchers looked for and analysed all of the published research about depression and vitamin D up until February 2011.
For mood disorders, 400-800 IU daily or 100,000 IU weekly has been taken by mouth for up to one month to improve symptoms of depression associated with seasonal affective disorder. In obese people, 20,000-40,000 IU of vitamin D has been taken by mouth per week for one year.or prostate cancer treatment, 10 micrograms of doxercalciferol has been taken by mouth daily for 28 days. A dose of 45 micrograms of calcitriol (DN-101) has been taken by mouth weekly for three weeks out of every four weeks. Doses of 400-1,100 IU of vitamin D have been taken by mouth daily for 4-7 years.