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The phrase "a heightened substantiation" is correct and usable in written English.
It can be used when discussing an increased level of evidence or support for a claim or argument.
Example: "The researcher provided a heightened substantiation for her theory, citing multiple studies that corroborated her findings."
Alternatives: "an increased justification" or "a stronger evidence".
Exact(1)
But theoretically, it could apply to virtually any item, so long as the item is not specifically subject to a heightened substantiation requirement under the code or regulations (as is the case now with certain travel and meal expenses, passenger automobiles, computers and cellphones).
Similar(58)
Second, individuals with greater assets are more likely to have a heightened desire for estate planning.
Sex workers are at a heightened risk for violence.
"It is a slightly heightened reality.
A rocky start heightened the tension for the pitchers.
The reports come at a time of heightened sensitivities.
This pattern of reoccupation following a period of heightened activity is common in other volcanic settings.
Police and FSB operatives imposed a regime of heightened security.
Westerns are really a series of heightened moments.
A talking animatronic cat heightened the absurdity.
But for Maria-Therese, blindness was a source of strength, heightened hearing, heightened senses, heightened awareness of the world and of the emotions of the people around her.
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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