Durvet Layer Booster with Omega-3 Poultry Supplement is designed to help improve the quality and quantity of eggs from your laying hen. It’s made with a blend of electrolytes, probiotics, vitamins and other nutrients to support your hen’s overall health. Marigold works to boost the color of egg yolks, while vitamin D3 helps promote stronger egg shells. This water-soluble supplement is easy to mix—simply add one scoop per gallon of water.