When you retest, you may want to consider getting both your 0.25 D levels checked (which is what you had done) and also your 1.25 D (active form) checked. Doctors typically only test the 0.25 levels and use that info as a proxy to assume what the active level is without testing the actual active level (I do not know why). When I had mine checked a couple of years ago, my 0.25 D level was 33 but my 1.25 active D level was through the roof - three times the upper limit. For a while I was concerned that I had Sarcoidosis, because my doctor couldn't explain why it was so high. It eventually normalized, and I'm left thinking that it was some kind of sign of an underlying infection. I happen to live in Florida and am in the sun pretty much every day and am tan all year round (except for part of the summer when the sun is too strong, then I'm usually only in the sun for a few minutes/day). I have a strong suspicion that the 0.25 tests are completely pointless. This is not to say that if you have a true deficiency, supplementing can't help, but you might want to confirm that you actually are deficient. Vitamin D is actually a hormone (not a vitamin) and I've heard of many people on this board not tolerating it at all or in high doses. The good thing about producing it yourself from the sun is that our bodies have an automatic 'shut-off' function once we've manufactured enough. It could be that the dose you're taking is just too high for you.