Remind me, what is collagen? Let's start with a quick science lesson. Simply put, "Collagen is a protein that makes up most of the skin's structure," explains
Dr. Jennifer MacGregor, M.D., a dermatologist at Union Square Laser Dermatology in New York City. "It gives it strength, thickness, and that youthful smoothness." Think of it as forming the foundation of the skin, keeping it firm and supple. You'll often hear it mentioned along with elastin, another important protein, which gives skin elasticity and the ability to stretch.
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