Thiamin Vitamin B1 V125 Thiamin vitamin B1 is watersoluble any excess is excreted & not stored in the body so needs to be replaced daily. Your need for thiamin will increase during illness stress surgery & pregnancy. Research has shown that individuals with diets high in carbohydrate require more thiamin than if their diet was high in fat. Recommended Intake One tablet daily as a food supplement or as directed by a practitioner. What does it do It may aid digestion especia