The Hulda Clark Zapper is a device developed by Dr. Hulda Clark, a controversial figure in alternative medicine. It is designed to emit low-voltage electrical currents to kill parasites, bacteria, and viruses within the body. The device operates on the premise that certain frequencies can disrupt the biological processes of pathogens, thereby aiding in the detoxification of the body.

The zapper typically consists of a simple circuit with two electrodes that are placed on the skin, usually on the wrists or ankles. Users are instructed to use the device for specific durations to achieve the desired effects. Dr. Clark claimed that the zapper could help with various health issues, including chronic illnesses and infections, although these claims lack substantial scientific validation.