A hologram bracelet, also termed an energy bracelet, is a small rubber wristband that is filled with a hologram. Theories suggest that the bracelet attracts special charges into the body, which affect the brain. Another theory is that a hologram has the ability to reflect infrared rays into the body, which stimulate the secretion of some chemical substances and neurotransmitters that may affect sensations like nausea and vomiting. Hologram bracelets were studied for their effect on chemotherapy-induced nausea and vomiting (CINV).