Sun chlorella 500mg tablets are an excellent source of active b12 for a nutritious kick. They are also gluten-free and are made with good manufacturing practices. Each box has 120 tablets, which is enough for a 20-day supply. Our chlorella has a 95% pulverized cell wall without using heat or chemicals for better bioavailability. country of origin : japan is gluten free : yes size : 120 tab pack of : 1 selling unit : each keywords : b12;bioavailability;plant;supplement;vitamin