Hello again, @chme

I, too, have found doctors to be a little wanting when it comes to nutritional matters. Even the clinicians in my neurologist's office seem somewhat vague when it comes to replying to questions about B6. The links @johnbisjop has sent make for good reading. EB-N5 has a website; unfortunately, all you'll find is glossy marketing material. However, I do trust the product's underlying substance.

Cheers!
Ray