I am on a 50,000 unit a week vitamin D regimen for 24 weeks (I m at week 13 now. What is the best vitamin D product I can obtain after I m done with this regimen? My doctor told me to take 1,000 units a day after this regimen, but, I m confused on which is the best one out there. Also I m hearing you need vitamin K to help with the absorption. I have been looking around and all I see in stores now is Vitamin D3,, which of course is not what I was told to use and when I asked the nurse about it, she said she d never heard of it (which I found some what strange). So, I m a bit confused. Plus I d like to know the accurate amount of sun exposure needed a day along with the supplement to maintain a good level. Thank You very much.