Benifuuki green tea (sometimes written as Benifuki) is a type of green tea that is booming in Japan for its ability to relieve allergies, such as seasonal allergies, cedar allergies, and hay fever.  A study has also shown that benifuki is good for mast cell activation syndrome. 
Methylated catechins, which can be found in green tea, are generally known for their bitterness and astringency; however, the Arahataen research team created a specific type of natural dirt to grow Benifuuki. This allows more methylated catechins to remain in the tea while retaining its aroma and flavor and, thereby, reducing bitterness and astringency.