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I don't know how safe there are, but not only are there glyphosate-free weed killers on the market, there are even Roundup-branded glyphosate-free weed killers available.

They seem to use acetic acid (Roundup Speed Ultra) and nonanoic acid (Roundup NL).

Are they safe? Are they effective? Hell if I know. I'm going to be wearing gloves and washing my hands after using, no matter how safe Monsanto says it is.

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60g/l acetic acid ... that's literally just slightly strong household vinegar. (safety precautions, especially not breathing it in, are definitely advisable though, it's a fairly strong acid)

But is it the only active ingredient?

It's the only one listed in the MSDS [1] so... probably?

[1] https://www.lovethegarden.com/sites/default/files/content/pr...

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