I find it hard to tell with milk, but for eggs it's generally pretty obvious by looking at the yolk. Small and unsaturated yellow in mass produced eggs; larger

I find it hard to tell with milk, but for eggs it's generally pretty obvious by looking at the yolk. Small and unsaturated yellow in mass produced eggs; larger and a deep orange color in the higher quality eggs that I've purchased. That can't quantify free range or organic, but given that the eggs which are labeled free range / organic have this noticeable difference in their contents, I think it's safe to assume the chickens were treated better and taken care of.