How are free-range eggs different from cage-raised eggs?

British researchers found that free-range eggs have 50% higher folic acid content and 70% higher vitamin B12 content. These data are higher than cage-raised chickens. Another study showed that free-range eggs were much higher in vitamin E and unsaturated fatty acids than caged eggs. Researchers from the University of Pennsylvania in the United States said that because free-range hens can move freely and bask in the sun, their metabolism and absorption are natural and normal, and the synthesis of various beneficial elements in eggs is guaranteed.  Japanese scientists have found that the vitamin D content of free-range eggs is much higher than that of caged eggs.

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