Have you had a bone density and bone scan done?My mom had low d and did the rx dosage and now her d levels are much better. She also has osteoporosis. As for the magnesium what I kearned here from Mrs D of course is make sure you don't get the oxide and you use a well absorbed kind. I use the glycinate and when constipated the oxide to just get moving but the glycinate I have read is what is absorbed.I take all my supplement seperate. I understand the pill overload but I am getting used to it and if it helps I will really adjust. I split mine up too through the day. I would call your doc and ask your ?'s about the d or speak to the nurse.