Food supplement. Why take berocca Just 1 tablet contains nutrients including vitamins b1 & b2 to help you keep going¹. Supports energy release¹. Supports mental performance². Reduces tiredness & fatigue³. How does berocca work? 1^ vitamins b1 & b2 each work with your body to naturally generate energy from your food. 2^ vitamin b5 contributes to normal mental performance. 3^ vitamin b12 contributes to the normal formation of red blood cells and helps reduce tiredness & fatigue.