The drink comprises water, glucose-fructose syrup, and citric acid, providing its base and tart flavour. It also contains sodium citrate, an acidity regulator, and ascorbic acid (vitamin C), an antioxidant. The product includes added flavourings and preservatives such as potassium sorbate and dimethyl dicarbonate to enhance its shelf life. It is sweetened with aspartame and acesulfame K, and contains important vitamins such as niacin, pantothenic acid, vitamin B6, and vitamin B12. Additionally, the product contains beta carotene for colouring. ​

Boost Isotonic Sport Orange does not list any major allergens such as milk, eggs, gluten, nuts, or soy in its ingredients. However, it contains aspartame, a source of phenylalanine, making it unsuitable for individuals with phenylketonuria (PKU). As formulations can change, it’s advisable to check the product label for the most current allergen information before consumption.