A composition is provided that includes a microvesicle derived from an edible plant and a therapeutic agent conjugated to the microvesicle. The therapeutic agent can be chemically-linked to a plasma membrane of the microvesicle with a cross-linking agent and the edible plant can be a fruit or a vegetable. Methods for treating an inflammatory disorder or a cancer are further provided and include administering to a subject in need thereof an effective amount of a composition including a microvesicle derived from an edible plant and having a therapeutic agent conjugated to the microvesicle.