This site states this specific framing directly, closing its own ingredients explainer: the formula is not five isolated compounds — it is designed as a stack.
Worth reading "stack" as this site's own term for ingredients working together toward shared targets, rather than each botanical acting entirely independently of the others.
This site separately groups its five ingredients into three fronts — airway support, soothing/antioxidant support, and oxygen utilisation — worth reading that grouping as the concrete expression of this "stack" framing.
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