Originally Posted by mrsD

Stabilized R lipoic is better absorbed. This was actually measured in volunteers. 100mg a day is usually enough.

I'd take at least 1000mcg orally as a study showed only 13mcg gets absorbed from this amount into the blood. I'd use the methylcobalamin as it is activated, and inexpensive. People with the MTHFR mutation cannot methylate B12 or folic acid properly.
So since the money is about the same, get the best there is...
methyl form.

8017413

Take the B12 on an empty stomach also for best absorption.
It doesn't matter with the Stablized R-lipoic as that is very soluble and quickly absorbed. Some people report heartburn with this supplement, so a little food might help with it if you are sensitive that way.