But soy sauce can contain as many as 18 amino acids ... Compared to well-known brands like Kikkoman and Yamasa, it's a touch heavier on the salt with 1,050 milligrams of sodium per tablespoon.

You can enjoy the aroma of shoyu more at room temperature when you use it as a dip or pour it on food," a publicist at soy sauce maker Yamasa Corp. said. The darkened color and loss of flavor ...