Sustagen® Collagen is a formulated supplementary food which can be of assistance where dietary intakes of nutrients and energy may not be adequate. Sustagen® Hospital Formula Plus Fibre is a formulated meal replacement and cannot be used as a total diet replacement. Sustagen® Optimum™ is a food for special medical purposes and is specifically formulated for medical conditions where nutritional needs cannot be met through diet modification alone. Must be used under the supervision of a healthcare professional.