INS and Hyperglycemia: In diabetic mice, the hypoglycemic effect of polysaccharides from Laminaria japonica was observed together with increased insulin and lipid levels in serum [140,141], while an unidentified polysaccharide from the red algae Gracilaria lemaneiformis, alleviating hyperglycaemia and pancreas and kidney tissue damage, likely acts thanks to its antioxidant effects [143].