Every year when I have my regular physical, my Vitamin D is low. This is not uncommon for people with chronic pain because we tend to not spend as much time outside. However, I started taking 2000 iu and I still show as low, so I was told to increase to 5000 iu. I can definitely tell a difference in my pain levels when I don't take the vitamin D or if I run out, but I think somehow I am either not absorbing as much as I should or my body processes it too quickly. I have similar problems with pain meds. I get drug tested every month and even if I take the meds right before my appointment my test shows low values. Anyone else have vitamin D deficiencies that effects your pain levels? Or problems with pain medication wearing off too quickly? Even my fentanyl patch, which most people have to change every 72 hours, I have to change every 48 hours or it wears off completely by the end of day 3. Input? Advice?