Phaseolamin is the name of protein extract obtained from white bean (Phaseolus vulgaris) demonstrating alpha-amylase inhibiting activity. The extract is commonly used in many so called 'starch blockers' as anti-obesity and anti-diabetic remedy The mechanism of phaseolamin action was discussed and clinical and animal trials evaluating biological effects of use were reviewed. The result of the studies show, that phaseolamin has got potent anti-amylase activity in small intestine and it may be useful in specific health conditions. But the data are still limited and the research should be continued.