Most American grocery store soy sauce is also not authentic soy sauce. Soy sauce has to be aged from soy, salt, wheat, and a fermentation starter. American grocery store soy sauce is typically salt water with flavor additives.

Ingredients for a cheap American soy sauce: soybean, corn, water, sugar, sodium benzoate, salt, caramel color, monosodium glutamate, citric acid, potassium sorbate.