I buy the Da Vinci sugar-free syrups all the time and love most of them. I only use them to flavor my coffee.I recently opened a bottle of the sugar-free Kahlua syrup and I may end up throwing it out. It smells awful, kind of sour. I don't know if it should smell this way in the bottle or if there is something off about MY bottle, but the odor is unbearable.I researched it online and can't find anything in relation to the Kahlua flavored syrup smelling funny.Better to toss it out than find out later on that there is something wrong with my particular bottle. I won't buy this flavor again.Sue