This product is amazing! I am a sports and medical massage therapist & a caffeine addict. I would have coffee in the morning and green tea in the afternoon to try to avoid the dreaded caffeine crash. I started using Instant Oxygen instead and was surprised at how easy the transition was. It gives me immediate energy and clarity to focus on my client without any of the jittery side effects. I work very long days and usually came home quite exhausted. Now I come home and have the energy to take care of me. I recommend this product to my clients who have very active lifestyles and families at home. Whether they are professional athletes or office athletes Instant Oxygen increases their energy and performance.