I'd get the Doctor's Best Benfotiamine 150mg.

If you are worried about high doses, just do 150mg a day.

If you get no negative reactions, you can increase to 300 for a couple of months and see if that helps.

I'd stay away from mixtures of things. You cannot control mixtures or see what is really doing what.

I say this about "reactions". I had great hopes for NAG-- n-acetyl glucosamine, but it seems to inflame my nerves worse.
I never expected that, since I have used glucosamine in the past (with not much results). I've tried 3 times, and got inflamed nerves all 3 times!