 Health Canadas Radiation Emitting Devices RED Act provides exposure time guidelines for sunbed use. These guidelines are intended to protect sunbed users from overexposure to UV radiation. Overexposure is defined as exposure that exceeds the amount needed for vitamin D production and could lead to skin or eye damage. Acute overexposure induces sunburn. However, the effect of the recommended time exposure schedule on serum 25OHD response has not been characterized. Further, it is unknown if the maximum time exposures are required to reach andor maintain optimal 25OHD levels. The aim of the current study is to characterize serum 25OHD response to regular sunbed use following the time exposure schedule recommended by Health Canada. 