> Turns out they are talking parts per BILLION,  not ppm.

Some common substances are lethal at levels of parts per billion, such as

botulinum (botulism)	270 ppb
tetanospasmin (tetanus)	75 ppb

On the other hand, glyphosate is only about 3 times as toxic as pure alcohol. 

Ethanol	LD50 =  918 grams
Glyphosate   340 grams

and is less toxic than table salt, or bleach

Sodium Chloride    258 g
Sodium Hypochlorite  136 g

PLB

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