The fact that the medical profession has latched onto this so quickly amazes me.

Why don't they understand B12 the same way?

I am still concerned that people will do things willy nilly, and take too much.
So for people with chronic pain and other neuro issues, please get tested.

I've been doing about 1000IU daily (3 x 400IU tabs from Naturemade D3) for 2 winters now. I don't take any in the summer when I tan up from being outdoors.
I had noticed that I feel and move better in summer and then crash in winter and ache more.

I have not had a D level run yet. And I am doing my light visor every day now, started in Oct. The light therapy makes a HUGE difference for me. Much better pain levels.(reduced). Less stress too. (but my job called yesterday, wanting me back---have to consider that one carefully!)