In a nutshell Vitamin A supplementation (VAS) is the mass distribution of vitamin A capsules to preschool-age children to reduce child mortality. GiveWell believes VAS is one of the most cost-effective programs donors can support. We estimate that it costs ~$1,000 to $8,500 to avert a death in locations where GiveWell supports campaigns. We think VAS is cost-effective because:| GiveWell