<Tr> <Th_colspan="2"> Legal status </Th> </Tr> <Tr> <Th> Legal status </Th> <Td> <Ul> <Li> US: OTC </Li> </Ul> </Td> </Tr> <Ul> <Li> US: OTC </Li> </Ul> <Li> US: OTC </Li>

Which of the following are functions of thiamine