Comment by lossolo
8 hours ago
I was taking 2x2000 IU with almost no sun exposure and then did bloodwork. My level was 77.8 ng/mL. The lab's reference ranges listed 30-50 ng/mL as optimal, 50-100 as high, over 100 as potentially toxic, and over 200 as toxic.
I don't know why this is downvoted, I had a very similar experience a while back. I took 4000 IU/day for about 4 months, insignificant sun exposure and ended up at 60 ng/mL (lab listed normal range as 30-40).
My starting levels were unknown but I assumed they were low given my usual sun exposure and some low-energy symptoms (which resolved a couple of weeks after I started taking it). I discontinued VitD then and now I only take 1000 IU/day in the winter.