Lucinda, I think doctors often times, are too dependent on "normal levels". Normal is a generalization, and we do not all fit that prodocol. It's not normal for a person to have celiac disease, or neuropathy, or diabetes, or CFS, or sleep apnea, or, or, or. So, if some of us have these different syndromes and such, how can a doctor determine normal for us by a healthy person's standards. A level of 500 for B12 is not normal for me, I need a much higher level. With Vit D, if 50 is considered an optimal level, how my level of 26 be normal, it sound way too low to me.

Sometimes, we have to cross the line and accept that it's up to us to fix ourselves. I research and research before I make a decision to try something. Had I listened to doctors about my B12 level, I probably would have seen some nasty changes in my neuropathy.