Types of Collagen: Which One Actually Matters? Collagen comes in different forms, and each one plays a specific role in the body. Type I is the most abundant collagen we naturally have in our skin, which is why it’s the form most commonly used in high-quality skin supplements. Marine collagen is one of the richest sources of Type I, and it’s often preferred because it’s well-absorbed and widely accepted. Type II mainly supports cartilage and joint function, so it serves a different purpose and i