hi here is a very interesting link it covers far more than i could think of its a good one from harvard clinic. the link <link> i do hope this answers your question. good luck
what can prevent vitamin d from being absorbed into your body. i was diagnosed with osteoporosis and osteopenia. i had a dexa test and blood work which showed my vit d level @ 15. dr. put me on 50 000 ius of vitamin d once a week for 8 weeks - did this 4 times. just had more blood work and my vit. d level only came up to 23 - still very low. my question is why isn't it coming up. now he has be on the same 50 000 for another 16 weeks. i also get 2 000 a day in my multi vitamin. do certain foods prevent vitamin d getting into the body.