ɐkˈoːɹdɪŋ tʊ ɐ stˈʌdi pˈʌblɪʃt baɪ ˌɛmˌaɪtˈiː tɛknˈɑːlədʒi ɹᵻvjˈuː, ðɪ ɛɡzˈækt mˈɛkənˌɪzəm ʌv ɪts ˈɛfɪkəsi ɪz nˌɑːt nˈoʊn.
According to a study published by MIT Technology Review, the exact mechanism of its efficacy is not known.