I have been taking a B-complex for many years now and I agree that it makes a difference for me. If I forget to take it I don’t feel as well that day. I think that is great that you can actually determine exactly how it is helping you.
They say thiamine supplements don’t cross the blood brain barrier easily. There was a supplement called subulthiamine made in Japan that was designed to be easily absorbed. There is also a variant called Benfothiamine which also is easily absorbed. I tried the benfo one time, but no effect. But then again nothing seemed to work on me back when I was taking generic zyprexa. Some things that did not work before are suddenly working it seems.