Josephine, In the mail today I got a letter from my Rhuemy about test result for some blood work I just had. Seems I am Vitamin D defecient. They are looking for a level of 35 or more and I've got 8. Obviously also enclosed was a script for 5000 units Vit D 1xweek for 8 weeks, with a lab slip for restest in 8 weeks. I will call all the necessary DRs in the am but 1. this shouldn't interfer with the big OP on the 18th, 2. May have contributed to the demise of my knees if has been going on for a while? 3. Any Vitamin D megadose side effects I want to know about?