Moi Aussi: High levels of B12 *800*, and normal urine and serum mma, but crescents only on thumbs, and ridges on all nails.

Great book: Could it Be B12? written by a nurse and doctor. Get it at Amazon. What an eye opener the book was. It agrees that the cutoff of B12 is too low and should be at least 350 or more. It also shows how you can have normal serum MMA levels, normal serum B12 and abnormal urine MMA. Urine MMA is the definitive test for B12 problems (Pernicious Anemia) , which is an MS mimicker. And so treatable. Cheaply.