If you have a unopened bottle of Coka Cola that was bottled 15 years ago is it still safe to drink it?

No, it is not safe to drink a 15-year-old bottle of Coca-Cola, even if it is unopened.

While the high sugar content of Coca-Cola acts as a preservative, it does not completely prevent the growth of bacteria and other microorganisms. Over time, the flavor and quality of the soda will deteriorate, and it may become unsafe to drink. Additionally, the plastic bottle may leach chemicals into the soda over time, which could pose a health risk.

For these reasons, it is not recommended to consume Coca-Cola or any other carbonated beverage that has been sitting unopened for longer than a few months.