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My understanding is that there is no alternative to Glyphasate which is definitely safer. There are some candidates, but there's not research to be sure whether they are better, or worse. What would you propose?

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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.

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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