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Discover LudwigThe phrase "are harmless and effective" is correct and usable in written English.
You can use it when describing something that does not cause harm and produces the desired results or benefits.
Example: "The new herbal remedies are harmless and effective for treating mild anxiety."
Alternatives: "pose no risk and yield positive results" or "are safe and beneficial."
Exact(1)
A 1994 law exempts them from having to prove, as drug manufacturers do, that their products are harmless and effective.
Similar(59)
Traditional medicines, although argued to be harmless and effective, in most cases neither the chemical entity nor the molecular mechanisms of action were well defined.
Many are harmless and widespread.
Sometimes they are harmless, and sometimes they are not.
Snaps are harmless and safe around children.
Some turtles are harmless and should simply be relocated nearby.
Good fun is harmless and safe.
Some tournaments were harmless and some rough.
It is harmless, and caused by stress.
Tomlinson's delusions were harmless, and not widely shared.
While some bits were harmless and hilarious — "Poke!
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com