Synopsis

Source of validity: Scientific
Rating (out of 5): 3

Fat liver oil, commonly known as cod liver oil, is primarily recognized for its high content of omega-3 fatty acids (EPA and DHA) and fat-soluble vitamins A and D. Its use to support the structural system—primarily bones and connective tissues—does have scientific validation, primarily due to its vitamin D and A content. Vitamin D is well-known for its essential role in calcium absorption and bone mineralization, while vitamin A contributes to bone growth and remodeling. Multiple studies support that supplementation with vitamin D, especially in populations at risk for deficiency, can improve bone health and reduce the risk of fractures. Cod liver oil was historically used to prevent and treat rickets, a bone-deforming disease caused by vitamin D deficiency.

However, while the connection between cod liver oil and bone health is solid, the evidence for its effects on other aspects of the structural system, such as muscles, ligaments, and cartilage, is less direct. The omega-3 fatty acids found in cod liver oil may exert some anti-inflammatory effects that could theoretically benefit joint health, but robust clinical evidence in this area is limited. Overall, the primary scientific justification for its use in supporting the structural system lies in its vitamin D content and its historical use in bone health, rather than direct effects on the entire structural system.

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