Seems to be a problem for me. Since I restarted with this form of B-12 I've seen a huge jump in my energy levels and a decrease in my PN symptoms. Somewhere in these forums I have a list of all the things I was taking. No time to hunt it down now but I'll be looking at that soon and will begin adding one vitamin or supplement back in at approx 2 week intervals. So, bottom line for me, it seems that I have issues with absorbing B-12 from foods and my digestive tract. This just really brought this issue home to me since I restarted the B-12.
If anyone recalls, I suddenly hit a spot where *something* I was taking was causing a major increase in symptoms. I had started several new supplements at the same time and couldn't pin down precisely what was causing the problems. So I stopped everything. And didn't restart (other than Vit-C and E that I've always taken) any of the others until I had the better form of the B-12. Also, I'm taking much more Vit-C than I've ever taken before. I've gone as high as 8000mg a day with no backlash, so to speak.

So, now we'll see what we can see.