I have two brands of soy sauce at home. They come in about one half
gallon containers. One brand said a tablespoon provided 40% of your
daily requirement for v-C, and 4% of iron. The other brand provided
only 6% of iron. I checked the internet at diet facts, and they said
soy sauce provides zilch. Where do the producers come up with this
information.Do they test it themselves or farm it out to experts. Or
do they just put something on there believing they will never be
double checked.

Tom