IIRC naringin has an indirect effect on coffee, where it inhibits an enzyme that is involved in metabolizing caffeine. So the outcome is that the effect of you

IIRC naringin has an indirect effect on coffee, where it inhibits an enzyme that is involved in metabolizing caffeine. So the outcome is that the effect of your coffee lasts a lot longer, instead of being more potent. Edit: Now that I go looking again, there is also evidence against this conclusion: https://www.eurekalert.org/pub_releases/2003-04/aps-rsm040903.php https://www.eurekalert.org/pub_releases/2003-04/aps-rsm04090...