Eggs from free-range hens are higher in folic acid
and vitamin B12

Now there's another good reason to purchase eggs from pastured poultry farmers: you may be getting more folic acid and vitamin B12, two very important vitamins. This information comes from a British study published in 1974. At the time, British consumers were concerned about the trend toward factory farming. Specifically, they thought factory eggs might not be as nutritious as eggs from free-ranging birds. An elaborate study confirmed their suspicions. The eggs from free-range hens contained significantly more folic acid and vitamin B12, as you can see by the graph below.

The researchers also looked for differences in the fatty acid content of the eggs but did not find any. Now we know why. In the 1970s, little was known about the benefits of omega-3 fatty acids, so the researchers didn't even bother to look for them in the eggs.

A. Tolan et al, "Studies on the Composition of Food, The chemical composition of eggs produced under battery, deep litter and free-range conditions." Br. J. Nutrition, (1974) 31:185.

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