What does the energy benefit come from? Is there caffeine?

The energy in CardiO2 Energy Chews is created by you. SuperBeets CardiO2 Energy Chews’ unique plant-based compound helps support efficient oxygen use during activity—to help you feel more energized throughout the day. The more efficiently your body can convert oxygen into energy during activity, the more efficiently your body can produce energy. There is no caffeine or stimulants in CardiO2 Energy Chews.