Of course, thereย isย a place for some of the lower-dose vitamin D supplements you see out there (think anything less than 3,000 IU)โspecifically when someone is taking multiple supplements that contain vitamin D3, like a multivitamin and a bone orย immune health supplement, highlights dietitianย Jess Cording, M.S., R.D., CDN.* A lower-dose product can also be an easy way to augment your current D routine in the winter months, she suggests.