What is cod liver oil?

Cod liver oil is an oil extracted from fish liver and usually contains vitamins A and D. Vitamin A Vitamin A is important for maintaining normal visual function, immune system health, and skin and mucous membrane integrity. It helps improve night vision and promotes cell growth and differentiation. 2. Vitamin D Vitamin D plays a key role in calcium absorption and utilization, helping to maintain bone health. It is also associated with the proper functioning of the immune system. Cod liver oil is often used as a vitamin A and vitamin D supplement, and may be recommended especially in the following cases: 1. Nutritional deficiencies If an individual lacks sufficient vitamin A and vitamin D in his or her diet, cod liver oil can provide a supplement to these important nutrients.2. Certain populations of infants, young children, and older adults may require additional vitamins A and D to meet their nutritional needs. 3. Bone Health Vitamin D is important for bone health, so cod liver oil may play a role in preventing and treating bone-related diseases such as osteoporosis. However, there are some precautions to be taken when using cod liver oil: 1. Excessive intake of vitamins A and D may cause adverse reactions such as headache, nausea, vomiting, dry skin, etc. Therefore, before using cod liver oil or any other vitamin supplement, follow your doctor's or nutritionist's advice to ensure the correct dosage. 2. Allergic reactions Some people may be allergic to cod liver oil or its ingredients. If allergic symptoms occur, such as rash, shortness of breath, etc., discontinue use immediately and seek medical help. 3. Other sources Vitamin A and D can also be obtained from a balanced diet. For example, intake of foods rich in vitamin A, such as carrots, squash, spinach, etc., and synthesis of vitamin D through proper sunlight exposure.