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Here one more article which proves that the red marine algea could be very useful dietary supplement:
General health benefits show red marine algae useful in weight-loss programs and for lowering cholesterol and fat in the blood. It contains soothing, mucilaginous gels such as algin, carregeenan, and agar, which specifically rejuvenate the lungs and gastrointestinal tract. Once thought of as a liability that blocked assimilation, the tough cell wall in Dumontiaceae has been found to be invaluable. It binds with heavy metal, pesticides, and carcinogens, and carries these toxins safely out of the body. Contained within the cell walls are polysaccharides, which are a complex of simple sugars. These long chained complex sugars stimulate interferon production as well as other anti-tumor and immune- enhancing activity (improving activity of T- and B-cells). Other compounds in the cell wall are related to those found in friendly bacteria which fortify and strengthen our immune systems to fight against invading organisms and toxins.