[QUOTE=mrsD;1137220]This is a reminder -- glenntaj is correct.

The ranges for vitamins reflect generalized "normals" who were chosen and NOT taking any supplements.

High range B12 is desirable because getting it into the central nervous system is by passive diffusion from high to low. The lower the blood level the less gets into the CNS.

Doctors are so used to ranges in blood tests indicating disease, they think high B12 is dangerous. But there is no upper limit to B12 use...so don't worry about it.

The only concern is for the rare person with polycythemia vera... this is a rare disease of the bone marrow where too many red cells are formed. This would show up in a normal CBC screening test.

Thank you MrsD and Glenn..
I am still supplementing with B12 even though my Level is good (high)! Do you think in your educated opinion(s), it makes sense to increase my Meth-B12 to 5000 mcg? I cant help but wonder if a higher dose of B12 (like Melody) along with B1 and Folate (800mcg) could help with the pins and needles and burning in my legs and feet (?)...