The Energy Capsules should be swallowed like a vitamin and are designed to be taken as needed. We suggest spacing your Energy Capsules at least 6-8 hours before bedtime to avoid nighttime restlessness. Each capsule contains approximately the same amount of caffeine as one cup of coffee (100mg). The Energy Capsules will start working in about 30-60 minutes, with effects lasting an average of 6-8 hours.