content: People lost in the desert can drink their own urine to survive and avoid dehydration, so that's not a good analogy. glyphosate is definitely lethal.  Now, Roundup is not the same as Glyphosate, but contains it. Pre-mix bottles of Roundup have like 2% or 4% Glyphosate. The concentrate bottles used to be something near 18% back in the 1980s. And today, near 41%: close to half. That means someone would need to drink nearly 1.5 cups to 3 cups of Roundup herbicide to ingest a theoretical lethal dose of Glyphosate.