More and more doctors are now testing vitamin D levels as part of your blood work on your annual physical. We guard ourselves from sunshine to avoid skin cancer. If you are watching your fats, or just don't like milk, you may not get enough foods fortified with vitamin D. And the levels they recommend to stay healthy are increasing.
I startefd out at 1,000 units, then increased to 2,000 when the level still wasn't high enough. Then we went to 5,000 - I buy Nature Made brand at CVS or the CVS store brand. Both have a 5,000 unit pill. Its a tiny little thing so it is easy to take.