Compositions and methods for treating parasitic infections are provided. The compositions can include two or more of alpha-pinene, linalyl acetate, para-cymene, and thymol octanoate. The compositions and methods can be effective against, for example, protozoan parasites, helminthic parasites, nematodes, trematodes, flukes, cestodes, and the like. Formulations made from the composition are also provided, including formulations in which the composition is combined with a carrier to form a food product and/or a drink. The formulation can be, for example, a suspension, a solution, or an emulsion in an oily or an aqueous carrier; likewise, the composition can be provided in an encapsulated or microencapsulated form.