I've seen it mentioned but have no clue what it actually is (and can't read Japanese). I'm a noob myself, but I say keep it simple - water and fertilize. There are so many products on the market promising to do all kinds of things (and they probably don't). I personally wouldn't add anything else to my soil unless I knew 100% what it was and what it does. Proper watering and fertilization is likely all you need (and many years of it).