The ingredients for Halls Citrus Sugar Free Sweets include sweeteners (isomalt, aspartame, acesulfame K), citric acid, vitamin C (sodium ascorbate, ascorbic acid), flavourings, and colours (chlorophylls, carotenes, and anthocyanins). Regarding allergens, the product contains aspartame, which is a source of phenylalanine and must be noted for individuals with phenylketonuria (PKU). Some versions, particularly in the US, may also contain soy lecithin and should be checked for those with soy allergies, though the ingredients can differ depending on the manufacturing country. Excessive consumption of these sugar-free sweets may cause a laxative effect. The product is typically suitable for vegetarians.