Vitamin D Repletion in Lupus Requires About 2,000 IU Daily: The rheumatology literature still contains recommendations of 600-800 IU daily.

VANCOUVER, B.C. — A daily dose of at least 2,000 IU of vitamin D is required to elevate serum 25-hydroxyvitamin D levels above 30 ng/mL, the minimum threshold for optimal immune health, according to Dr. Diane Kamen, a rheumatologist at the Medical University of South Carolina in Charleston.