Collagen is a protein found in animal tissues, primarily in the skin, bones, tendons, and ligaments. Plants, including tropical leaves, do not have collagen. Instead, they contain cellulose, a different type of structural protein that provides strength and support to plant cells.

While some tropical plants are used in traditional medicine for skin health, they do not contain collagen. Their benefits are typically derived from other compounds like antioxidants, vitamins, and minerals.