This is the first study conducted in order to evaluate the efficacy of polyglucosamine L112 on body weight, insulin resistance, and cholesterol in patients with metabolic syndrome. The studies conducted to date have considered only the efficacy of chitosans on MS and were limited to blood glucose. Polyglucosamine L112 instead consists of standardized polymers characterized by >80% degree of deacetylation and a peak molecular weight (Mp) of about 65 KDa and was shown active on body weight, cholesterol levels and insulin resistance. This study demonstrated that the subgroup of patients suffering from MS and treated with L112 showed a significant improvement in 50% of the subjects despite the product being the only treatment administered for MS.