Why is the Nestle Lion Bar NOT suitable for vegetarians?

The Nestle Lion Bar is not suitable for vegetarians because it contains gelatin, which is derived from animal collagen.

Gelatin is a protein extracted from animal tissues, typically from the skin, bones, and connective tissues of cows, pigs, or other animals.

While some vegetarians may consume gelatin if it is derived from "unintentional" animal byproducts like bones used in stock, it's generally considered to be non-vegetarian.