Norway’s coastline stretches over 100 000 km, and along it grows massive amounts of brown seaweed, without a need for any agricultural land, fertilizers, or resources other than our ocean. What can we use it for? And more importantly, can we use all of it? When exploring the components of brown seaweed we find poorly understood carbohydrates, with good potential for pharmaceutical and medicinal applications due to their high bioactivities. The most important one: fucoidan.