For the past three years I have battled with so many changes to my health. It all started when I noticed I was still producing milk and I had stopped feeding my son almost 2 years before the discovery. Fatigue, headaches, and weight gain were issues. I could never get a clear answer as to what was wrong with me. The doctors did detect that I had vitamin D deficiency. Throughout this process of going to MANY doctors to determine what was wrong with me, I was also feeling nervous about what I should do in regards to birth control. I selected the Mirena and I can say that my vitamin D deficiency remains. I cannot conclude for sure if the Mirena prevents my levels to increase despite my efforts with supplements. However, I can say that the Mirena did not cause it. I have been diagnosed with having Hypothyroid issues, however I have still not bounced back to my old self. Still have major weight issues, TIRED, and Vitamin D doesn't seem to get any better. I hope you find out more information to determine your situation, because my luck has been pretty bleak!