Vitamin D

Hi Everyone, got a call on Friday from my rhemotologist, actually the nurse...anyway, he called in a Vitamin D supplement for me...I can't figure out the blood work but last time my vit d was right on the line between low and normal, not sure if it was the same or worse...anyway, he called in a supplement for me to take once a week...took my first dose on Saturday. I have lupus and with that sometimes comes vit d issues...anyone out there have low vitamin d too? For background, we get vitamin d from sunlight...apparently lots of folks now have low vit D because of not getting out in the sun AND all the hype about sunblock...obviously we need sunblock but we need some sun-time without block... BTW, I am incredibly fair skinned, light green eyes...and have a sun light sensitivity because of my lupus issues... Although we do have a convertible and I get out there as much as possible...but not much in the winter months in Maryland... Anyway, anyone else? I see him every 6-8 weeks, my next app't is mid-February...I will pick his brain then... I guess one of my most important questions is... Is the low vitamin d levels because of my malabsorbtion issue (WLS) or related to lupus....not sure if he will even be able to answer with conviction, but I have a burning question of WHY!! Any help is appreciated... thanks RAE