Undiluted flavouring from Flavor Art (Italy)"Bittersweet and delicious." Suggested percentage 2-3%Ingredients: Natural and Artificial Flavouring, Propylene Glycol..
Undiluted flavouring from EuroFlavor (Germany)"Tangy with a bitterness and a sweetness on the exhale. Unique and accurate flavor profile to an actual yellow grapefruit. FF NOTE: This flavor has a tendency to separate - shake as needed to maintain consistency."Alcohol, Propylene Glycol, Natural & Ar..