100% natural. Not too sweet. Lightly sweetened grapefruit soda with real juice. 90 calories per bottle. GuS is Grown-up Soda. GuS Star Ruby Grapefruit is a dry, refreshing soft drink made from this prized grapefruit variety. The Star Ruby is known for its bright red, tart-sweet juice. Contains 5% juice. No caffeine. No preservatives. www.drinkgus.com.