I've used all of the CSI syrups with great success.
Meaning you have won competitions or you are still alive?
http://www.food-info.net/uk/e/e150.htm
Success = tasty beers. And I'm still alive!
There is are two unverified assumptions at play here:
1.) Candi syrups contain these caramels.
2.) These caramels are bad for you.
I can't verify either of those.
Let's take the site you linked, which doesn't seem to indicate any ill effects health wise, but lists daily intake for C and D caramels as 200mg/kg body weight. Let's use me:
I'm 220 lbs. So > ~ 100 kg.
200 mg/kg * 100 kg = 20000 mg = 20 g
Let's say you use 2 lb of Candi syrup in a recipe and assume that they are entirely composed of these caramels:
2 lb. = 907195 mg = 907 g
5 gallons of beer = ~53 beers
907 g/53 beers = 17 g/beer = 170 mg/kg
So, assuming that 200 mg/kg is a health threshold, you could use up to probably 2.5 lbs with no ill effects. Given this criteria you could drink 1 beer per day brewed with that amount of ammonium caramel.
Again this assumes that the syrups are made of 100% of these caramels. I haven't seen anything that says these types of caramel are even a constituent ingredient.
AFAIK these syrups are made from beet sugar and water with some chemicals of course to facilitate the process, stability, etc.
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