Ask your doctor, really. When I got diagnosed with vitamin D deficiency (inside on the computer all the time, I'm quite pale) a few years ago the prescription

Ask your doctor, really. When I got diagnosed with vitamin D deficiency (inside on the computer all the time, I'm quite pale) a few years ago the prescription I got was for pills that had 50,000 IUs each and I was to take one twice a week. I recently got a new doctor and was getting bloodwork done and she saw the mention of the deficiency and she asked if I wanted that tested for... she said she usually doesn't bother because everyone in my state (West Virginia) is deficient, she just recommends people take 1000 IUs a day or so. Personally I take 10,000 IUs about every other day. At least assuming the stuff I ordered off Amazon is at all legitimate (vitamins and such things are such a super sketchy market, companies get busted selling sawdust pills all the time). One thing that I was not expecting, when I was on that prescription at first I noticed a marked improvement in my hearing (which I had not noticed being degraded at all previously...). I thought I was imagining it but upon doing some research it turns out that hearing loss is one of the possible complications of vitamin D deficiency.