This is not true. Although hyaluronic acid wasn't formulated to do so, science has proven they can create collagen. But many doctors agree that the amount of collagen made is not as much of collagen made is not as you can expect from products that are specifically formulated to create collagen. The function of collagen-stimulating fillers is to create collagen. Hyaluronic acid fillers add fullness. “With a hyaluronic acid filler, the collagen effect is modest when compared to a collagen stimulator,” says Dr. Calkin.