I use Kikkoman . If you look at the ingredients , most brands use hydrolyzed soy protein , and the sauce is "chemically made" , but a few don't list hydrolyzed soy protein , they list soybeans , which means the sauce is made by naturally fermenting the beans . (I think that's how it goes , I saw it the other night on good eats ) . I've tried quite a few brands and I like Kikkoman . On a side note , I was out of sauce one time when I got some chinese take out so I used the packet of "soy sauce " and the first forkful of fried rice I thought "that isn't soy sauce " so I looked at the ingredients ... water , salt , caramel color , sodium benzoate as a preservative . There was no soy sauce in it ! I don't know if all soy sauce packets are the same , but since then I usually keep a spare bottle in the cupboard .