This site's own realistic-timeline table opens with this specific period — worth understanding it on its own before the three periods that follow.
This site is direct: most people notice nothing measurable yet during weeks 1-2, and a same-day decongestant effect is explicitly named as something this product is not.
Worth crediting this site for naming what is NOT realistic at each stage, not just what is — a more complete honesty framing than a timeline table that only lists positive expectations.
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