I was super deficient being a programmer inside all the time. My levels were literally zero when I went in because I felt like I was dying, bones hurt, extreme

I was super deficient being a programmer inside all the time. My levels were literally zero when I went in because I felt like I was dying, bones hurt, extreme fatigue. 10,000 IU 3 times for three weeks fixed it. I've been taking 2000IU every day ever since, and my serum levels still don't go above 20.