> Amongst mammals, glyphosate is considered to have "low to very low toxicity". The LD50 of glyphosate is 5,000 mg/kg for rats, 10,000 mg/kg in mice and 3,530 mg/kg in goats.
If you wouldn’t drink a cup for fun, then do you know how many aggregate cups you’re getting per month from all the food you eat? They didn’t poof into existence. Every part of your food is from glysophate sprayed crops and animals that have food-chained them.
You've got a source for that? Looks like ~0.75 pounds per acre and a 3k pound per acre yield for soybeans. Of course not all of that ends up inside the edible part, but 1/4,000 is a long ways from 1/1,000,000,000
https://en.wikipedia.org/wiki/Glyphosate
I wouldn't just go drink it for fun, but for what it is, it's surprisingly safe.