My name is Christine Marquette and I'm a registered and licensed dietitian with the Austin Regional Clinic and I've been asked what does vitamin B1 do. Vitamin B1 is also known as thiamine and it is one of the B vitamins that actually is used as a catalyst in our metabolism. Without this particular vitamin our body is not able to process carbohydrates or proteins or fats effectively. So it is very necessary in the metabolism of all three of these major food groups. The other process that vitamin B1 or thiamine is involved in is in overall cell health. It is necessary for the integrity of our cell walls and helps make sure that when cell division takes place that no defective cells are formed as they are being divided. As far as other things that you may have heard from thiamine, some people report that thiamine or vitamin B1 may help ward off mosquitoes but there actually isn't any scientific evidence that B1 or thiamine can be used for this purpose. But remember thiamine has a lot of other uses in our body so it is very important in general that we do get enough of this particular B vitamin. It can be found primarily in fruits and vegetables and some nuts and seeds as well. So make sure that you are including a variety of these foods on a daily basis so that you do get enough vitamin B1 which is also known as thiamine, cause remember it does have a major role in our metabolism and in our overall cell health.