I take 5000 daily as a maintenance dose. Bloodwork has been basically perfect since I started doing that. If you are deficient doctors often prescribe a massive daily dose like 20000-30000 to get back to normal then drop down to a maintenance dose.

The nice thing with vitamin D is that you can actually check its level in bloodwork. The normal range is often considered to be between 50-125 ng/mL with below 30 considered deficient and above 120 or so considered too much.

I highly recommend people stay on top of this particular vitamin. In addition to evidence that a deficiency significantly affects your immune system functionality, it’s also uncomfortable. My spouse has been deficient in the past and experienced hand cramps, back spasms, muscle aches etc.

It’s fat soluble so it takes a few weeks to get it back to normal after supplementation