Thanks for your explanation! I was able to get a prescription for B1 only injections but this time I was prescribed 200mg per week, so that sounds like quite a large dose according to what your saying.
"Antonio Costantini's guideline and checks out (100mg injection 1x/2x weekly -> ~ 2g oral thiamin daily)."
Not knowing that I was going to get these injections I also order a bag of powdered B1 and Benfotiamine so I now have a pretty good supply in my hands to see what this will do for me.