Egg yolk powder is made of spray dried pasteurized egg yolks. It is rich in lecithin and a good emulsifier. Dried egg yolks can be stored at room temperature as long as they are kept cool and dry. Once opened, egg yolks should be stored in the refrigerator. Reconstituted egg yolks should be used immediately or refrigerated and used that day. Our Egg Yolk Powder is Made in the USA and contains no additives of any kind.