We probably don’t have to tell you: Collagen is trendier than ever. Once an ingredient relegated only to the skin care world, it has been quickly gaining steam since early 2016 as a functional supplement to aid in injury recovery, ease joint pain, improve gut health, and boost the appearance of hair, skin, and nails. Not to mention, it’s a convenient way to boost your protein intake.

Why so popular? Collagen is the most abundant protein in the human body—found in our tendons, ligaments, skin, muscles, bones, and blood vessels—and plays a vital role in maintaining its structural integrity. But unfortunately, our bodies produce much less collagenas we age, and we’re consuming far less of it from natural sources than we used to, which is why dozens of food and supplement companies are now looking to help you fill the void. READ MORE