Aloe ballyi is one of the few poisonous species of Aloe. It contains the hemlock alkaloid γ-coniceine.
Source: Waihenya RK, Mtambo MMA, Nkwenguila G, Minga UM. Efficacy of crude extract of Aloe secundiflora against Salmonella gallinarum in experimentally infected free-range chickens in Tanzania. J Ethnopharmacol. 2002;79:317–23. doi: 10.1016/S0378-8741(01)00397-X.