@melia7 I see. I drink a serving of kefir daily also, with occasional a slice of cheese in my sandwich. read that gouda has higher content of k2 and it tastes good, my opinion. natto is sticky and stinky! my current brand is 'shirakiku', ~1 tablespoonful is enough for a day I think ~1/4 of the little white container. I felt brand is not important just make sure they are made in Japan, and organic if available.