Hi all. I'm just wondering if anybody had experienced much in the way of side effects with the Thiamine? I've started to feel a bit 'fluey' and seem to have picked up a permanent headache. No coughing or sneezing so it's not a cold and it all started when i started Thiamine. Maybe just coincidence but thought I'd see if this has happened to anybody else. My dose is the started 4g a day and I've been taking it for about 5 days.