Hey Leonard and Lori Renee
For what it's worth...while going through all the motions to find the underlying cause of my SFN diagnosis, my B12 was found at 219 and methylmelonic acid levels off. My Neuro sent me asap for injections every 2 weeks and retested me every 3 months until B12 reached 535. At that point he was satisfied for me to take oral B12 daily. He will continue to monitor unless I feel the immediate effects of B12 slipping earlier.