We know that sufficient rest together with a healthful diet and exercise can do much to maintain a robust immune system. Sulfated polysaccharides from the sea can help.
Botanical science has discovered and identified a substantial number of substances and compounds from plants that can improve functions of the human immune response. They have probably been playing that supporting role as part of the human diet for millennia. One specialized group of immune enhancing substances are the sulfated polysaccharides, sulfur containing complex sugars found most notably in a select group of sea plants.