Milk does not naturally contain collagen. However, it is rich in two amino acids, proline and glycine, which are essential for the production of collagen in your body. These amino acids are building blocks for collagen synthesis, so consuming dairy products like milk, cheese, and yogurt can indirectly support collagen production.
While milk itself doesn't contain collagen, it can be a good source of nutrients that contribute to your body's ability to produce collagen.