Conclusions The data indicate that these algin products are free from any deleterious substances which adversely affect health when fed at levels which are at least 10 times higher than when used in foods or pharmaceutical products. The difficulties experienced with feeding the higher levels seem to be due, at least in greater part, to the physical texture imparted to the diets fed. This should not be a problem in the commercial use of the product. The data indicate that the three algin products which were tested are wholesome.