The Boost Oxygen 3L Canister provides all-natural respiratory support that is safe and effective. Unlike caffeine and other stimulants that can potentially harm the body with extended use, Boost Oxygen offers supplemental Oxygen in non-prescription form. One 3-Liter Canister gives you up to 60 one-second inhalations, which is enough for a day trip. Help is on the way with the Boost Oxygen 3L Canister! DISCLAIMER: Boost Oxygen is for recreational purposes only, ideal for athletes and sports enthusiasts, older adults, and people at high altitude or in poor air quality. No prescription is needed to purchase Boost Oxygen.