Husband had a Vitamin D level drawn with his normal blood work recently and the result showed he is deficient in Vitamin D. He has been taking 2000 IU of Vit D/day for more than 6 months now; prior to that time, he took 1000 IUs/day for 3 1/2 yrs. from a company with a reputation for very "pure" products. Yipes!! He obviously needs a much higher dose than 2000 IU which is twice the recommended dosage. He will begin taking 4000 IU/day now.

http://www.webmd.com/parkinsons-dise...-to-parkinsons

Low Vitamin D Level Tied to Parkinson's
Study: Vitamin D Insufficiency Often Accompanies Parkinson's Disease
By Miranda Hitti
Oct. 13, 2008 -- Parkinson's disease patients may be particularly likely to have low blood levels of vitamin D.

Researchers report that news in the Archives of Neurology.