Fucoidan also helps to prevent influenza outbreaks as well as battling HIV and herpes outbreaks. Long-term use of Fucoidan may lead to a mineral deficiency. So, it is important to supply minerals such as iron (no iron supplement if cancer is present unless there is a deficiency for sure), cobalt, manganese, and zinc when using long term (a year or more). Foods that contain iron are spinach, legumes, red meat, pumpkin seeds, and quinoa. Cobalt is part of vitamin B-12 so adding a B-complex vitamin will suffice. Food that contains manganese is leafy greens. Sign of zinc deficiency is loss of taste and smell, loss of appetite, decrease in immunity, depression, and excessive hair loss. Foods that contain zinc are meat, shellfish, and eggs. It’s perfectly fine to consume a large amount of Fucoidan for a long time. If you feed decent foods such as vegetables, meat etc, I doubt you will have a deficiency in these minerals.