I wonder if free range eggs also contain higher levels of Vitamin D. I was just thinking the other day that my girls are outside all day in the sunshine so wouldn't my eggs contain a higher level of D? I was reading that dogs produce vitamin D from the sun through their fur and people through the skin, so wouldn't chickens produce it through their feathers? Store eggs come from chickens which probably never see actual sunlight.
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I don't know who did the research for that particular page, but Mother Earth News did the research some time ago. In fact, I use the information from the MEN research on an information sheet I include in every dozen eggs I sell: