@sregan, great link!
Interestingly, I've been having some great results lately with sulbutiamine (a B1 derivative that can cross the blood-brain barrier, supposedly much more efficiently than regular thiamine). It took a week or so, but really gave me a mental lift, cognitively as well as emotionally. Doubly so when I combined with acetyl-l-carnitine at the end of week 2. I'd never had any benefit from ALC, but combined with the sulbutiamine gave me quite a good effect.
Then I added in small doses of a couple different kinds of choline and another nootropic, and, sight unseen, my chronic, low-level brain fog just lifted away like magic.

It was rather startling how well it all seems to work together.
From what I read, sulbutiamine (the B1) seems to work well in "stacks" of supplements. That's how it's worked for me.
It all (the stack) also seems to have had a deeply beneficial effect on my I stamina. I did over six hours worth of housework the Sunday before last, which I haven't been able to do in over a decade. I didn't get overwhelmed (my biggest problem with doing any large, drawn-out project but especially housework), frustrated, bored, or even sore after after all the lifting or bending. It was as if I was functioning more like I used to in my late 20's/early 30's. Weird and great all at the same time.
So maybe methylation heals our bodies and mitochondria, but most of us don't get exactly the results we want from it because the methylation supps don't act specifically on the mind. After this experience I've concluded that stamina is as much a function of the mental processes as the physical. Before these nootropics my body had a lot of energy since I got stable with the methylation, but my mind couldn't really keep up. Body and mind are more in sync now, with equivalent levels of energy. I'm not completely well but am moving at the speed of light compared to what I was even a month ago.
Still too soon to say if the effect of all this is going to be permanent, but I'm encouraged so far. I've had a few small sides (little jitteriness here and there), but dosage modification and a little bit of time has taken care of it. The effect does seem pretty stable.
Right now I've cycled sulbutiamine out of the stack and will be adding it back in at the end of next week. Cycling is recommended to get the best benefit from it (from all nootropics, actually). And low doses to start, increase if no sides.
Larger point being that my experience is kind of parallel to the experience of the person in the article: a foundation of physical health built with other supplements, then unexpected and startling improvement in mental AND physical energy when adding B1 (in my case, sulbutiamine and some other nootropics). I'm also kind of bouncing from project to project, too, so am probably going to have to retrain my brain, since there are apparently a lot of sloppy habits still rattling around in there. But bouncing is much better than laying down, and it all started with the sulbutiamine (B1).
I'm also taking benfotiamine as a prophylactic against damage from high blood sugar, but I don't know if it's doing me any good or not. I don't have any symptoms from damage, but I do have blood sugar issues.