Reply To: I had my Vitamin D level along with other blood tests done in April. My Vitamin D3 level came back at 6 and my D2 level was 4. My potassium levels which have been low for a long time was also very low 3.3 but not as low as it has been in the last (0.9 in Jan 2011 required hospitalization). My doctor put me on 50,000 iu once a week for 8 weeks. I noticed some changes fairly soon as my head began not to sweat as nearly as much as it had been. I also became regular as far as bowel movements. I have Crohn's disease and other intestinal issues that have caused me problems for years. I have now been off the Vitamin D for about a month and I am starting to feel off again as well as my bowel habits have again become erratic and my head has again begun to sweat. How long does it take for Vitamin D levels to normalize and stay normal when they are as low as mine were? Should I request to have a prescription for Vitamin D? My glucose, TSH, T3 & T4 levels were all within normal ranges.