It is the rare doctor indeed you can trust today about nutritional testing, proper interpretation of same, and advice.

Most have little if any training in this subject. I have collected the best medical papers on these subjects and they are on threads at PN and Vitamin forum here.

You would be amazed at how many people come here with "normal" blood work, and in fact are very low in B12. The lab ranges are still reported in this country are far behind new medical treatments from 1999 on to today. The new acceptable B12 reading in US is 400pg/ml. NOT 180 or 200, or 300! But doctors will tell these low patients, that their tests were "normal". Go figure.

How many doctors know that Vit D is NOT a vitamin? It is a proto-hormone.

How many know that B12 is stored in the liver so when times get scant for food, we can rely on that for a while? We evolved this to survive famines.

How many know that pyridoxal (activated B6) is stored briefly in skeletal muscle?

How many know that folic acid is not the active form of folate?
(methylfolate is the active form).

How many know that cyanocobalamin is not active in the body until it is converted to methylcobalamin...which may fail due to genetic errors? How many doctors even know what methylcobalamin it and that is costs pennies a day to supplement orally OTC?