Okinawa™ Flat Belly Tonic - Ancient Japanese Tonic Melts 54 LBS Of Fat - Effective Fat Loss Supplement Many users have reviewed Okinawa Flat Belly Tonic as an effective and powerful weight loss supplement. The reason behind the tonic's success is that it is an all-natural product, and it's 100% safe to consume as it has no side effects. The Okinawa Flat Belly Tonic is based on a formula inspired by ancient Japan’s Okinawa region. It’s a known fact that the Okinawa region didn’t have a single obese person in the entirety of the place. Their fit body and robust immune system resulted in the longest life expectancy in the region. Over the years, it was observed that the ingredients they used in their daily meals were passed down to them by their ancestors and were the reason behind their fit and slim body.