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an inhaled medication The bronchodilation following inhalation of ipratropium bromide is primarily a local, site-specific effect, not a systemic one

Guo JQ, Lin H, Kantarjian H, Talpaz M, Champlin R, Andreeff M , Glassman A, Arlinghaus RB

All evidence derives from animal models and in-vitro studies

Product sourcing also matters because low-quality or mislabeled peptides can create additional risk

Ptak R, Doganci N, Bourgeois A (2021) From action to cognition: neural reuse, network theory and the emergence of higher cognitive functions

So the "which is better" question is really a trade-off between absorption and convenience, and that's the lens this whole comparison uses