6000.IU have been for years.
What does vitamin d do for your body
It is a fat-soluble vitamin that has long been known to help
the body absorb and retain calcium and phosphorus; both are
critical for building bone. Also, laboratory studies show
that vitamin D can reduce cancer cell growth, help control
infections and reduce inflammation.
Vitamin D | The Nutrition Source
https://www.hsph.harvard.edu › nutritionsource ›