If you eat expired opened syrup is that bad?

Eating expired opened syrup is generally not harmful if it has been stored properly and shows no signs of spoilage, such as mold or an off smell. Syrup has a high sugar content, which helps preserve it, but its quality may deteriorate over time. If the syrup looks and smells normal, it’s likely safe to consume, but it's always best to use your judgment and err on the side of caution. If in doubt, it's better to discard it.