1. Vitamin C and D are mainly found in cod liver oil.

The main function of vitamin A is to maintain normal body growth, reproduction, vision, epithelial tissue integrity and anti-infection immunity. . Vitamin A deficiency can cause: pediatric bone growth retardation; affect tooth enamel cell development, teeth are not sound; epithelial tissue damage; immune function is easy to cause various infections of the respiratory tract, digestive tract and urinary tract.

The main function of vitamin D is to promote the absorption of calcium and phosphorus in intestinal mucosa, and to promote the reabsorption of calcium and phosphorus in renal tubules. Vitamin D deficiency can cause: calcium and phosphorus by the intestinal absorption, bone-like tissue calcification disorders; rickets, manifested as frightened, sweating, irritability and bone changes.

Vitamins A and D are fat-soluble vitamins. Vitamin A is present in the animal's liver, especially fish liver, followed by milk and eggs. The other is in the form of carotene found in foods such as carrots, tomatoes, beans, and green leafy vegetables. In the liver, carotene is converted to vitamin A.

Vitamin D is mainly found in the liver of animals, especially in the liver of marine fish. In addition, 7-dehydrocholesterol in the skin can also be converted to vitamin D under UV light. The body takes in vitamin D from sunlight and from food.

2. Under what circumstances need to add cod liver oil?

The following conditions need to be supplemented with cod liver oil:

If the infant's breast milk is insufficient or after weaning, no timely addition of egg yolks, animal livers and other foods rich in vitamins A and D, and carotene-rich vegetables, fruits, etc.; or suffering from chronic diarrhea, hepatobiliary diseases affect vitamin A and D absorption Or there is a chronic wasting disease that increases the consumption of vitamins A and D; or the lack of sunshine; and growth is too fast to increase the demand and so on can cause vitamin A and or D deficiency.

The content of vitamin A in milk is higher than that of cow's milk. If the nursing mothers have sufficient nutrition and a balanced diet, most of the vitamin A in milk can meet the needs of infants. Vitamin D is less in breast milk and milk, so no matter it is for human milk-fed or milk-fed infants, the daily dose of vitamin D 400 units must be given from 2 to 3 weeks after birth. Three years, especially for premature infants, twins, and children with the above-mentioned factors causing vitamin A and D deficiency, need additional vitamins A and D.

After 2 and 3 years of age, the growth rate of children is slowed down, dietary varieties and outdoor activities increase, and generally no additional supplementation of cod liver oil is required.

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