My opinion: You can watch videos that say other B1’s are better; they are more powerful; they cross the BBB; etc. but you cannot find much (if any) info on long-term positive results [success stories]. Best to leave Benfothiamine, TTFD, Sulbutiamine, etc. alone and stay with what works for other people.
I have tried TTFD... I kept overdosing on yet another lower dose. Started at 50mg, gave it up at return of symptoms with 17.5mg (it took me 10 days to OD on 50mg [probably should have quit at 3 days] and 4 weeks on 17.5mg)...
My sweet spot is 1000mg B1-hcl oral.... [Feeling Great at 65 days and counting] 😀
Show me wrong; Please supply your success story… 😕