Reply To: I was diagnosed with Vit D deficiency in Nov 2014 (22). My doctor gave me 50,000UI a week for a month then in late Dec was tested again my level only increased 2 pts so now I am taking 3,000ui daily but am concerned that when I'm tested again in Feb 2015 my levels my still be under 30. Is it possible that my other medications are interfering with the absorption of the Vit D? I take 3,000 Vit D3, Sertraline, Zoloft, and METOPROLOL SUCCINATE XL and I take them all at the same time along with cinnamon, tart cherry and CoQ10. Could this be a problem?