What Is Nagano Tonic? Nagano Tonic, also referred to as Nagano Fat Burning Tonic, is a supplement rooted in the dietary habits and lifestyles observed in the Nagano region of Japan. Known for its high population of centenarians—people who live to be 100 years or older—this region attributes its residents’ longevity and robust health to diets rich in natural ingredients, antioxidants, and traditional tonics. Nagano Tonic aims to emulate these health benefits by combining carefully selected natural ingredients that promote vitality, boost energy, and support overall well-being.