With the rise of collagen supplements has come more scrutiny over the quality of ingredients. In order to find a top-notch product, ask your retailer or the manufacturer about the collagen in products—does clinical research support its joint or skin benefits? Also be sure to ask where and how the ingredient was sourced. “Collagen is produced all over the world, so it’s important to pay attention to the way the animals are raised,” says Corey Friese, Vital Proteins cofounder and vice president of product strategy. The three main types of collagen are bovine, chicken and fish, so responsible companies source only the highest quality ingredients that meet the same standards you’d look for if you were eating those foods—for example, grass-fed cattle or wild-caught fish.

Of course, if you’re vegetarian or vegan, collagen is off limits. That’s one reason that the next frontier for collagen may be plant-based collagen precursors, Whittel says. “Ingredients such as high-quality vitamin C, preferably organic plant based; specific amino acids such as glycine, proline and lysine; and silica-rich compounds such as bamboo extract all help our bodies synthesize and produce more collagen.” Some collagen companies are also adding these ingredients to collagen to help you get more value for your money.