I wonder if that is the right way ahead - to drop some artificial vitamins in the milk, which is probably mainly bought by those who could anyway afford a proper balanced diet (based on vegetables and legumes with all the needed nutrients). The majority of undernourished children in the villages are not part of the commercial milk value chain, hence, do not benefit from it. It would make more sense to support the families (through awareness building and production support) to use good food, like e.g. carrots for Vitamin A or eggs for Vitamin D, and prepare it properly (like adding oil or cooking vegetable not to long). Fortification of commercial goods is neither effective nor efficient for solving hidden hunger.