This site states this specific framing directly in its own timeline table: a same-day decongestant effect — this is not that kind of product, named for weeks 1-2.
Worth reading "this is not that kind of product" as this site's single most direct sentence setting a boundary — a plain statement rather than hedged or qualified language.
This specific unrealistic expectation directly echoes this site's own separate comparison against decongestant sprays, which work only on the moment — worth reading both together for the complete picture.
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