Maltodextrin and fructose are both carbohydrates, but they’re absorbed and used by the body differently. Maltodextrin is a glucose-based carbohydrate that is relatively easy to digest and provides a quick source of energy. Fructose is a simple sugar that uses a different pathway for absorption.
Using a combination of maltodextrin and fructose in a sports drink can allow you to consume more carbohydrate than using either one alone, making the combination popular for endurance sports such as running, cycling and triathlon.
For DIY sports nutrition, maltodextrin provides the bulk of the carbohydrate, while fructose can be added to increase the total carbohydrate content and balance the flavour. The right ratio depends on your individual needs, carbohydrate target and tolerance.