On Mar 18, 5:35 pm, " >
wrote:
> 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

There are two ways to do it. One is to actually test the product, but
that is expensive. The most common way is to use the ingredients at
their specific amounts and determine calories and nutrition from that.
If I says 6% iron, I'm sure it is in there..possibly from a
perservative. dkw