I get my Vit D levels tested every six months, summer and winter. It is a cheap test. No reason not to do it. And I have been surprised several times at how low it gets, even though I supplement. I had to make several adjustments to get up to my desired (optimal) level.
I get my Vit D levels tested every six months, summer and winter. It is a cheap test. No reason not to do it. And I have been surprised several times at how low it gets, even though I supplement. I had to make several adjustments to get up to my desired (optimal) level.