ðɪ ɪfˈɛktɪvnəs ʌv ɪts jˈuːs tə pɹɪvˈɛnt ðə dɪvˈɛləpmənt əvɚ ɹˈæʃ ˈæftɚ ʃˈɔːɹttˈɜːm ɛkspˈoʊʒɚ tə pˈɔɪzən ˈaɪvi hˈæzbiːn səpˈoːɹɾᵻd baɪ pˈɪɹᵻvjˈuːd stˈʌdi, ænd ɪz lˈaɪkli dˈuː tə ðə plˈænt kəntˈeɪnɪŋ sˈæpənˌɪnz.
The effectiveness of its use to prevent the development of a rash after short-term exposure to poison ivy has been supported by peer-reviewed study, and is likely due to the plant containing saponins.