Dreambirdie -- I was diagnosed as thiamine deficient very early on -- 12+ years ago. I don't know if I am now, but I assume so, mainly because of my inability to produce stomach acid, and the need for less HCL since starting the thiamine. Also, I've been eating waaaaay too much white rice over the years, something that depletes thiamine big time. I ate brown rice as well, but mostly white...am now trying other things. Hindsight is always...you know... That's a good sign that you were able to tolerate it! As for Wahl's diet -- it's great that it worked for her, but she must have had the right bacteria, etc., in order to handle all those high, high oxalate foods she was insisting everyone eat (or drink). ??? edit: I've been taking 3 or 4 a day, but then cut back, due to budgetary constraints.