Japan has the world's highest life expectancy due to the Japanese have used Natto to increase energy and stamina, nourish heart and bones, remove toxicity, and slow the aging process for centuries. Natto is a soybean powder fermented according to a traditional Japanese recipe and dehydrated. It is extremely rich in rare vitamins and minerals. Natto is the only food containing both "Nattokinase" and Vitamin K2, which help cure/prevent myocardial infarction and cerebral infarction. Natto is also known to build up immunity. -You can drink the tea hot or cold. -Add it to soup, smoothies or yogurt and enjoy! -Great with any kind of dishes. -Avoid exposure to direct sunlight, keep in a cool and dry place. -Only ships freshly produced products.