The drink comprises carbonated water, sugar, and glucose-fructose syrup, providing its sweetness. Taurine (0.4%) and caffeine (0.03%) are included to enhance energy levels. Citric acid and sodium citrate act as acidity regulators, while flavourings contribute to its distinctive taste. Sweeteners like aspartame and acesulfame K are added. Colours such as sulphite ammonia caramel and riboflavin are used for appearance. Sodium benzoate serves as a preservative. The beverage is fortified with vitamins (Niacin, Pantothenic Acid, Vitamin B6, Vitamin B12) and contains inositol. ​

Boost Energy Original 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. ​