In search of smooth skin, you’ll hear a lot of chatter about “boosting collagen,” but what does that mean exactly? Environmental factors like sun exposure and pollution can break down collagen, making it more likely you’ll see wrinkles staring back at you in the mirror, says New York City–based board-certified dermatologist Marisa Garshick, MD. Age is a major factor, too.

Collagen loss begins in the early twenties, says Dr. Garshick, making it important to both preserve the collagen you have — and stimulate your skin to produce it faster. Here are 20 smart ways to do just that: