What are the functions and benefits of fish liver oil?
Sep 15, 2025
Source: Cainiu Health
Dr. Yu Yongchao
Introduction
Under normal circumstances, the main functions and benefits of fish liver oil include supplementing vitamin A, supplementing vitamin D, protecting vision, promoting calcium absorption, and maintaining mucosal health. When taking fish liver oil, the dosage should be controlled according to a physician's instructions or the product label, as excessive intake may lead to vitamin A and vitamin D toxicity. It is contraindicated for individuals allergic to fish, and should be used with caution by patients with hypercalcemia or hyperphosphatemia.
Generally speaking, the main functions and benefits of fish liver oil include supplementing vitamin A, supplementing vitamin D, protecting vision, promoting calcium absorption, and maintaining mucosal health. The specific details are as follows:
1. Supplementing Vitamin A
Fish liver oil is rich in vitamin A, an essential fat-soluble vitamin for the human body. Vitamin A participates in various physiological processes. Appropriate intake can meet the body's requirement for this vitamin and provide foundational support for maintaining normal physiological functions, especially suitable for individuals whose dietary intake of vitamin A is insufficient.
2. Supplementing Vitamin D
Fish liver oil also contains vitamin D, which can supply this essential nutrient to the body. Vitamin D plays a crucial role within the body. Proper intake can compensate for vitamin D deficiency caused by insufficient sunlight exposure or diet, helping maintain the body's normal utilization of minerals, suitable for individuals with limited sun exposure or unbalanced diets.
3. Protecting Vision
Vitamin A is a key component of the light-sensitive substances in the retina. The vitamin A in fish liver oil can directly provide nutrition to the eyes. For vision problems such as blurred vision or night blindness potentially caused by vitamin A deficiency, appropriate intake can help maintain normal retinal function, relieve eye fatigue, and assist in protecting vision.
4. Promoting Calcium Absorption
The vitamin D in fish liver oil can promote the absorption of minerals such as calcium and phosphorus in the intestines and reduce calcium loss. For individuals needing calcium supplementation, taking fish liver oil together with calcium supplements can enhance calcium absorption efficiency, help meet the bones' demand for calcium, and support bone health.
5. Maintaining Mucosal Health
The vitamin A in fish liver oil can nourish the mucous membranes of the respiratory and digestive tracts. It helps maintain the normal structure and function of mucous membranes, reducing dryness or damage, thus supporting the body's mucosal barrier.
When taking fish liver oil, it is important to follow medical advice or the product instructions to control the dosage. Overdose may lead to vitamin A or vitamin D toxicity. It is contraindicated for individuals allergic to fish. Patients with hypercalcemia or hyperphosphatemia should use it with caution. Children, pregnant women, lactating women, and individuals with impaired liver or kidney function should take it under professional guidance and avoid adjusting the dosage on their own. If discomfort such as nausea or headache occurs during use, discontinue use promptly and consult a healthcare professional.
