The ingredients in Schweppes Blackcurrant Flavour Cordial include water, sugar, citric acid, colours (Caramel E150d and anthocyanins), acidity regulator (sodium citrate), flavourings, preservatives (sodium benzoate and potassium sorbate), and sweeteners (aspartame and sodium saccharin). It’s important to note that the product contains a source of phenylalanine, making it unsuitable for individuals with phenylketonuria (PKU). Nutritionally, a 100ml diluted serving contains approximately 14 kcal, 3.1g of sugars, 0g of fat, and 0.06g of salt.​

Regarding allergens, Schweppes Blackcurrant Flavour Cordial does not contain common allergens such as cereals containing gluten, celery, soya, crustaceans, eggs, fish, mustard, molluscs, lupin, milk, nuts, peanuts, sesame, or sulphur dioxide. The product is suitable for individuals following kosher, halal, vegetarian, and vegan diets, as well as those with coeliac disease.