I was Vit D deficient in my blood tests a year before I started
vaping.
Yeah..I went
through hell & back getting diagnosed properly, I was in horrible pain throughout my body & the fatigue was insane, turned out vitamin D was my issue, I was a non smoking anything at the time...was using nicotrol inhalers. I did 3 script rounds of 50,000 IUs to get my levels up (18 weeks), I've since stayed on 5,000 IUs a day to maintain. If you are low, 5,000 IU's won't correct the problem, that's a maintinence dose.