Dr. Chang from Stanford School of Medicine showed the unique effectiveness of broadband light treatment on skin aging. BBL, also known as intense pulse light, is a commonly available and popular method to ‘‘rejuvenate’’ the skin. BBL uses a broad band of noncoherent light waves, ranging from 560 to 1,200, which are absorbed by different molecules in skin. According to the American Society for Aesthetic Plastic Surgery, over $215 million dollars were spent in the United States in 2009 on these procedures.
The study showed that BBL induces skin rejuvenation on molecular level, i.e., the pattern of genes' expression more closely resembles younger skin. However, the molecular changes that are induced by this treatment are still to be unclear.