kashruth in the absence of a hechsher

Question

As I recently received the following gift without a hechsher, I have the need to ask the following question: Is it possible to determine if this product is kosher despite there not being a Mashgiach or any kosher supervision at all? Old Fashioined Cola Syrup Sold by Vermont Country Store Retailer located in Weston, VT Listed Ingredients: Cane Sugar, Caramel Color, Natural Flavor, Citric Acid, Phosphoric Acid, Sodium Benzoate Many thanks