Active energy1, mental performance2. 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 berroca 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.