Better to do a blood test to find out how much you already have it on your blood level. Recent my blood test showed I only have 15 which is very low so, the doctors advised me to get vitamin D for next 4 months. If you are living in a sunny place then you don't have to worry about too much cos, you can get vitamin D free supply from sunshine.. <br />
There are some disadvantages too, please have a look at this site when you have few mins.. <br />
cod liver oil 2 table spoons a day get mint flavor as plain taste like caca
I take 5000 units of Vit. D
Your skelington may need oiling take an omega oil or ginko biloba to reduce inflamation good too, dont take both, it can make your blood too thin.