Many anglers have already discovered the positive effect of N-Butyric Acid or whey on fish. N-Butyric Acid is an appetite enhancing valuable food source produced during the lactic fermentation of maize. This is again an indispensible additive of any high-quality boilies. It should be handled very carefully, because due to its high concentration a few drops of it are sufficient to achieve the desired effect. On waters where fish are mainly fed on corn, outstanding results can be achieved with this product. Grass Carp adore its highly acidic taste, so if you go for Grass Carp you can use it diluted as a dip.