The first B vitamin to be discovered, thiamine, or vitamin B1, is essential for normal growth and development. Its main function is to help with the conversion of carbohydrates into energy. Thiamine also promotes cardiovascular and nervous system health.
Thiamine works synergistically with the other B vitamins, so it’s best taken as part of a “complex” supplement rather than on its own. Deficiency is rare, but older folks and alcoholics may want to watch thiamine levels.
Thiamine may also be used therapeutically to help with some health concerns, such as diabetes (specifically with numbness or tingling), anxiety, depression and heartburn. Be sure to take it with a meal for best absorption.