Specially formulated with 100 mg of caffeine including green tea and green coffee extracts each great tasting drink is also packed with 5 g of micronised amino acids including bcaas delicious sugar free and just 30 calories per serving optimum nutritions essential amino energy delivers caffeine to help increase alertness and focus throughout your day as well as essential amino acids mix up essential amino energy any time youre looking to improve mental focus and alertness its ideal