Xellia Pharmaceuticals ApS

For over 120 years, we've been doing one thing: making the anti-infective medicines the world depends on. Not because it's easy. Fermentation-based manufacturing is painstaking work — part science, part craft, part patience. The molecules we produce are too complex to be made any other way. They grow in fermentation tanks tended by people who've spent years learning exactly when to intervene and when to wait. That's why more than 500 pharmaceutical companies in 80 countries trust us with their supply. Not because we're the biggest. Because we show up. Because when you call us, you get people who understand your timelines, your patients, and your problems — and who treat them as their own.