Chicken eggs contain all the essential amino acids, micro and macro elements that are useful for the human body - calcium, potassium, phosphorus, magnesium, sodium, chlorine, sulfur, iron, zinc, iodine, copper, manganese, chromium, fluoride, molybdenum, borium, cobalt. It is rich in B group vitamins (В1, В2, В3, В6, В9, В12), also contains Е, С, D, А, Н, РР, К vitamins. Chicken eggs are divided into categories, which differ in weight.