Blackmores Multivitamins for Men with Sustained Release Technology is a tailormade blend of essential vitamins & minerals for men. It is formulated to support immune system function and energy production. This convenient one-a-day multivitamin supports testosterone levels and mental performance and is designed with a unique sustained release technology that release nutrients to the body gradually throughout the day. Multivitamins for Men with Sustained Release Technology provides a steady release of nutrients to give you lasting energy for up to 8-hours a day.