The poison is in the dose; the LD50 for glyphosate is in the neighborhood of 5 g / kg, which amounts to around a quarter liter of pure glyphosate for a 50kg subject. You want to stay orders of magnitude below the LD50, for obvious reasons.

"How much can you safely drink?" depends heavily on the concentration. A cup of pure, or even the most concentrated form the sell in stores, might do it. Or might not. Once you dilute it for application - usually gallons of water to the tablespoon of concentrate - a cup becomes significantly less threatening.

The problem with that approach is that it is just about acute lethality and does not consider long-term effects from prolonged exposure that are hard to measure.

Further it ignores interactions with other chemicals that are also in use, something that we know is pretty common from medications.

Especially with endocrine disruptors there is also the effect that several chemicals might work in the same direction, where a safe dose of one chemical might be harmless but safe doses of 10 chemicals combined might not be safe anymore.

Well, no, but when the question is "will you drink a cup of this?" a good question is "will this kill me outright?"

Then don't say a whole glass of it would be perfectly safe.

NO, wrong again. They boldly claimed with a direct, verbatim quote "You can drink a whole quart of it and it won't hurt you." and then refused to drink it when offered.

I don't think GP is distrusting m disagreeing with you; it sounds to me like they're saying "if your point is that it's safe in trace amounts but not for drinking a whole glass, you shouldn't be offering to drink a whole glass"

Watch the video! He claims "You can drink a whole quart of it [RoundUp] and it won't hurt you."

(It's ambiguous whether reporter means "glyphosate" to mean "RoundUp" product as to avoid advertising a brand name or the compound by itself.)

Roundup contains mroe than glyphosate.

You probably shouldn't drink a quart[1] of glyphosate, but you definitely should not drink a quart of roundup.

[1] what the fuck is a quart?