1. Foods rich in vitamin A: carrots, yellow-green vegetables, eggs, yellow fruits, spinach, pea sprouts, red sweet potatoes, green peppers, cod liver oil, animal liver, milk, dairy products and cream.

2. Vitamin A can also maintain the health of epithelial tissue and increase the resistance to infectious diseases. Long-term lack of vitamin A can cause atrophy, keratinization or necrosis of skin and mucosal epithelial cells.

3. Vitamin A only exists in animal tissues, and there are more vitamin A in egg yolk, milk, cream, cod liver oil and animal liver.