Gum Syrup Gum Syrup is increasingly confused with “Simple Syrup” (aka “Sugar Syrup.”)Gum Syrup is Simple Syrup, but with gum Arabic added. This addition helps to keep the sugar in suspension, while adding a silky, smoother quality to the syrup. About 100g of gum Arabic is used per litre of syrup. Some manufacturers now use glycerin instead of gum Arabic. The syrup is often flavoured.