Whilst we are only now figuring out how exactly the relationship between the gut and the brain actually works, the clear fact of the matter is that the gut and the brain are linked together. Tyrosine is required for the development of dopamine in the brain. Dopamine can help your brainpower, as it is a neurotransmitter that influences mood, motivation and performance. This type of tea has higher levels of EGCG than normal green tea, so it could help your brainpower even more. One of the best ways to ensure you always have more energy, however, is diet.