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| Eggs—a nutritional powerhouse What's in a yolk? With the exception of riboflavin and niacin, the yolk contains a higher proportion of many of the egg’s vitamins and minerals than the egg white. These include vitamin B12, zinc, iron, iodine, copper, selenium, and calcium, as well as vitamins A, D, E, and K. Buy organic, free-range eggs for the most nutritional value. |