"Ray Calvert" wrote in message .com...
Calling nutrients is stretching the definition of chemicals. Most people
eat all sorts of food that is fortified by vitamins and minerals. Our
cereals are absolutely coated with them. Nutrient is just vitamins and
minerals for yeast. They need it and they will not hurt you any more than
vitamin B will hurt you. campden and a few other additives might be suspect
by some but nutrients should not be.

Ray


While I agree with most of this there in one point you should be aware
of. Urea, often a component of yeast nutrient does produce a bit of
cyanide in solution.

This should not normally be a problem at all becasue as long as you do
not go everboard with it or addit late the yeast will absorb all of
the urea and cyanide.