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Discover LudwigThe phrase "active ingredient" is grammatically correct and commonly used in written English.
It is typically used when discussing medications, cosmetics, and other products that have a specific component responsible for producing the desired effect. Example: "The active ingredient in this pain reliever is ibuprofen."
Dictionary
active ingredient
noun
The specific compound in a natural or man-made mixture that is responsible for the mixture's activity.
Exact(60)
Its active ingredient varies.
Active ingredient: why are youshouting?
Its active ingredient is bleach.
"The active ingredient is marketing".
Aspirin's active ingredient comes from willows.
Theobromine is the active ingredient in cocoa.
But the main active ingredient is caffeine.
The drug still only contains about $1 of active ingredient.
Indeed, green mango contains acetone, the solvent's active ingredient.
Data is an essential active ingredient for improvement.
Fluidity is the active ingredient of Miyawaki's style.
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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