The drink is crafted with carbonated water and includes taurine (0.4%) to enhance energy levels. Citric acid and sodium citrate are added for acidity regulation, while flavourings provide the distinctive taste. Sweeteners such as aspartame and acesulfame K replace sugar, offering sweetness without the calories. Caffeine (0.03%) is included to improve alertness, and sodium benzoate acts as a preservative. The drink is fortified with vitamins—niacin, pantothenic acid, vitamin B6, and vitamin B12—and contains inositol to support energy metabolism. Colours like ammonia caramel and riboflavin are used for appearance. ​

Boost Sugar Free Energy Original does not contain any of the major allergens such as milk, eggs, gluten, nuts, or soy. However, it contains a source of phenylalanine due to the presence of aspartame, making it unsuitable for individuals with phenylketonuria (PKU). As formulations can change, it is always advisable to check the product label for the most current allergen information before consumption.