The Claim
Fish oil supplements, including cod liver oil and shark liver oil, provide omega-3 fatty acids (DHA and EPA) and vitamins A and D, which are essential for neurological development, vision, and cardiovascular function.
What the research says
Roughly balanced
Support and challenge are close. The picture may shift as more studies come in.
These are independent scores, not a percentage. Higher-grade studies count more, so a single strong opposing study can outweigh several weaker ones.
Fish oil supplements contain omega-3 fatty acids and vitamins A and D that are required for normal brain development, eyesight, and heart function.
See the scientific wording
Fish oil supplements, such as cod liver oil or shark liver oil, are a source of omega-3 fatty acids (DHA and EPA) and vitamins A and D, which are essential for neurological development, vision, and cardiovascular function.
Omega-3 fats become part of brain and eye cell membranes, making them more flexible and better at sending signals. Vitamin A helps the eye detect light, and vitamin D helps blood vessels stay healthy. Together, they keep the brain, eyes, and heart working properly.
What the research says
1 studyThis study says fish oil supplements like cod liver oil really do contain the good fats and vitamins that help your brain, eyes, and heart work well — and they’re generally safe to take because they don’t have too much harmful mercury.
Score breakdown, mechanism chain, raw evidence, ideal studies needed & 1 supporting studies
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.