>Now there is no side effects of taking vitamin b on even higher dose, Dude, come on. This is completely false and easily verifiable. "Thiamine may cause side effects. Tell your doctor if either of these symptoms is severe or does not go away: flushing hives itching weakness sweating nausea restlessness" (thiamine is vitamin B1) [https://medlineplus.gov/druginfo/meds/a682586.html](https://medlineplus.gov/druginfo/meds/a682586.html)