If you're more comfortable starting slow, that's fine, but do increase your dose to 500 mg per day as quickly as possible.  The World Health Organization recommends 500 mg thiamine HCl per day when deficiency is suspected.  Dr. Lonsdale had researched high dose thiamine for decades, and he has used higher doses, 1 to 3 grams in some cases.   Like I explained above, it's at that 500 mg level or higher that passive diffusion happens and thiamine can get into cells.  Inside the cells, thiamine turns the mitochondria back on.  Mitochondria produce energy the cells use to function.  I had been taking a multivitamin containing thiamine HCl regularly and still had become deficient. ...