These days, it feels like collagen is everywhere. Scroll through Instagram for five minutes and you'll probably see someone stirring collagen powder into coffee or talking about the latest anti-ageing drink. The beauty industry has made collagen sound like something you can simply buy in a jar.But that's only half the story.Your body already makes collagen on its own. In fact, it's the most abundant protein in the body. It gives structure to your skin, strengthens your hair and nails, supports y