Great antibacterial antifungal antiseptic boosts immunity excellent anti-hemorrhagic agent boosts metabolism. Geranium (pelargonium graveolens) essential oil contains some interesting and well-studied phytochemicals (plant based natural chemicals). depending on the species citronellal tends to be the phytochemical in largest quantity making up around 30% of a drop of geranium essential oil. Other phytochemicals of note include trans-geraniol 10-epi-gamma-eudesmol alpha-pinene isomenthone limonene and lina.