ThiActive B-Complex provides a full spectrum of nutritional B vitamins to complement the action of thiamine (vitamin B1) within the cell. It includes two highly bioavailable vitamin B1 derivatives, Benfotiamine and Thiamine Tetrahydrofurfuryl disulfide (TTFD) which have unique molecular structures. The structure of thiamine derivatives allows them to pass through intestinal and cellular membranes without the requirement for a transport system. Once inside the cell, they deliver thiamine which can be activated and used as a cofactor in important biochemical processes.