Why do I feel tired?

Your mitochondria generate energy, but thiamine is like the mitochondria's spark plug. Thiamine (vitamin B1) is essential to help you convert fuel into energy to help you feel more energetic and power all your body's systems.

To increase your energy, you need to fix the underlying cause of your vitamin B1 deficiency. You also need to consume foods high in vitamin B1 or take a vitamin B1 supplement.