SUSTAGEN® OPTIMUM™ tastes great and provides complete nutrition so you can use it as a supplement when you are unable to meet your nutrient requirements through dietary intake alone. This could be due to poor appetite or illness , particularly if you have been taking antibiotics. It contains probiotics and dietary fibres (prebiotics) to support digestive function and high quality protein to help maintain muscle mass. It also contains 27 essential vitamins and minerals , including dietary antioxidant vitamins C & E and copper, iron, selenium and zinc to support immune function. SUSTAGEN® OPTIMUM™ is also low in lactose and has a low GI.