low vitamin D levels?

I just got bloodwork done and my vitamin d levels were low. Everything else was normal. What is causing this? I drink fortified milk and fortified orange juice every morning and take a mulivitamin everyday!! I am also outside for at LEAST 30 minutes a day, usually more....it makes me nervous that something else is causing this. My level was 25 the norm is 20-45, but they like to see the high end especially at my age (34)

Re: low vitamin D levels?

Are you on any medication? Some medications deplete the body of vitamins. For example, birth control pills deplete the body of magnesium.