Flavour modulation in foodstuffs, beverages, pharmaceutics, tobacco products and oral care products, using a flavour modulating substance selected from substances represented by formula (I) or formula (II), edible salts thereof and edible esters thereof:These substances are capable of imparting highly desirable taste attributes in the products in which they are incorporated. In addition the flavour modulating substances are capable of modulating and complementing the sensory impact of other taste imparting substances. The substances are applied in flavour compositions, foodstuffs, pharmaceutics, tobacco products and oral care products. Examples of flavour modulating substances include 2-hydroxy-N-(2-hydroxy-2-methylpropyl)-propanamide, N-lactoyl 1-amino-2-propanol, N-lactoyl 2-amino-1-propanol, N-lactoyl 2-amino-2-methylpropanol, N-gluconyl 1-amino-2-methyl-2-propanol, N-gluconyl 1-amino-2-propanol, N-gluconyl 2-amino-1-propanol, N-gluconyl 2-amino-2-methylpropanol, N-(2-mercaptopropyl)lactamide, edible salts thereof and edible esters thereof.