i found out im extremely low vitamin D. so low that shes putting me on 100,000iu once a week. i was on 50,000 a week but my levels dropped. she has no idea why. and that might be keeping me from absorbing some medications. if thats the true then maybe i can be on lower doses of these harsh medication. seroquel, lithium, lamictol, ambian. maybe have your doctor check yours?