The present invention generally relates to systems and methods for the transdermal delivery of the heptapeptide ZW1. In some aspects, ZW1 may be contained with a composition comprising a lecithin, such as phosphatidylcholine. In certain embodiments, the lecithin is present in liposomes, micelles, liquid crystals, or other configurations. The composition can take the form of a gel, a cream, a lotion, an ointment, a solution, a solid “stick,” etc., that can be rubbed or sprayed onto the skin. Other aspects of the present invention are generally directed to methods of making or using such compositions, methods of promoting such compositions, kits including such compositions, or the like.