I'm new to the forum but have been Primal for about 1 year. I have been using Damage Control Master Formula during that time and feel good. However, I was reading about vitamin D deficiency and am wondering if I need more than the 500 IU in DCMF. I work outside and in the summer I get plenty of sun, but now I'm pretty well covered up. (The high today is 7* fahrenheit). Any thoughts would be appreciated. Thanks.