Eating custard apple has been shown to stimulate and increase collagen production in the body. Collagen is a protein that gives the skin its elasticity, plumpness, and smoothness. As we age, collagen production becomes slow. This results in the formation of crease lines on the skin, sagginess of the skin, and wrinkly skin. Hence, it thickens and stimulates the production of collagen, therefore reducing the fine lines and wrinkles. Also, the compounds present in custard apple slow down the breakdown of collagen, improving the elasticity of the skin.