Starbucks vanilla bean powder, mainly used for vanilla bean frappuccinos, contains sugar. Additionally, coconut milk at Starbucks has sugar listed as an ingredient. To me, the vanilla bean coconut milk latte doesn't taste quite as sweet as lattes flavored with sweetened syrup. As far as sugar content goes, a grande iced version of this custom latte has 21 g of sugar, whereas a Starbucks blonde vanilla latte has 28 g of sugar.