Cod liver oil: benefits, dosage, contraindications
Other name(s)
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Family or group:
Fatty Acids
Active ingredients:
Docosahexaenoic acid (DHA)
Eicosapentaenoic acid (EPA)
Vitamin A
Vitamin D
Indications
Rating methodology
EFSA approval.
Eye Health ✪✪✪✪✪
The components of cod liver oil (EPA, DHA, vitamin A) are recognized for their effectiveness in developing vision in infants and children.
Posologie
Oral administration
10 - 20 mL
Pregnancy ✪✪✪✪✪
Results of a study suggest that maternal intake of cod liver oil during pregnancy is associated with a reduced risk of type 1 diabetes in the child. This association might be attributed to the effects of vitamin D or omega-3 fatty acids (EPA and DHA) present in cod liver oil, or to a combination of both. Clinical research shows that taking cod liver oil at a dose of 500 mg per day for 12 weeks, starting from the 24th-28th week of gestation, reduces HbA1c by 8.4%, fasting blood glucose by 41%, and insulin resistance by 43% from baseline values, in women with gestational diabetes. A reduction in perinatal complications and postpartum infections was also noted. Moreover, cod liver oil supplementation is beneficial for pregnant women as it provides vitamin D and omega-3 fatty acids essential for fetal development, particularly for bone growth and brain development.
Posologie
Oral administration
20 - 40 mL
Effects of Maternal omega-3 Fatty Acids Supplementation During pregnancy/lactation on Body Composition of the Offspring: A Systematic Review and Meta-Analysis
COMMISSION REGULATION (EU) No 440/2011 of 6 May 2011 on the authorisation and refusal of authorisation of certain health claims made on foods and referring to children's development and health.
Use of cod liver oil during pregnancy associated with lower risk of Type I diabetes in the offspring
Vitamin D Deficiency ✪✪✪✪✪
Epidemiological research has highlighted that increased daily intake of cod liver oil is associated with higher serum vitamin D levels. This suggests that its consumption could be an effective means of enhancing vitamin D intake, particularly during periods of low sun exposure. Additionally, a study involving postmenopausal women in northern Scotland demonstrated that those who consumed a daily cod liver oil supplement were less likely to suffer from vitamin D deficiency during winter and spring compared to those not taking a supplement.
Posologie
Oral administration
10 mL
Depression ✪✪✪✪✪
Results of a large-scale epidemiological study among Norwegian adults aged 40 to 49 and 70 to 74 show that daily oral intake of cod liver oil is associated with a 29% decrease in the risk of depressive symptoms compared to no cod liver oil intake. Rich in omega-3 fatty acids (EPA and DHA), as well as vitamins A and D, cod liver oil may play a role in protecting against oxidative brain damage and inflammation associated with depression and promote neurogenesis in the hippocampus.
Posologie
Oral administration
15 mL
Hypercholesterolemia ✪✪✪✪✪
Preliminary clinical research indicates that the daily consumption of 20 mL of cod liver oil for 8 weeks seems to increase levels of good HDL cholesterol (high-density lipoproteins) by 5 mg/dL from baseline. On the other hand, another clinical study conducted among men who had a myocardial infarction shows that a daily intake of 20 mL of Icelandic cod liver oil for 6 weeks reduces triglycerides by 18 mg/dL, without improvement in LDL levels. A larger clinical study on hypercholesterolemic patients shows that taking cod liver oil in combination with rosuvastatin (a drug belonging to the statin class) further reduces total and LDL cholesterol compared to rosuvastatin monotherapy.
Posologie
Oral administration
20 mL
6 - weeks
Scientific Opinion on the substantiation of health claims related to EPA, DHA, DPA and maintenance of normal blood pressure (ID 502), maintenance of normal HDL-cholesterol concentrations (ID 515), maintenance of normal (fasting) blood concentrations of triglycerides (ID 517), maintenance of normal LDL-cholesterol concentrations.
Role of Cod Liver Oil in Reducing Elevated Lipid Parameters
Rheumatoid arthritis ✪✪✪✪✪
Clinical research has shown the benefit of consuming 1 to 10 g of cod liver oil over a period ranging from 3 months to 9 months, in reducing pain and lowering the consumption of non-steroidal anti-inflammatory drugs in patients with rheumatoid arthritis. However, studies remain preliminary or of limited quality.
Posologie
Oral administration
1 - 10 g
36 - weeks
The concomitant consumption of cod liver oil causes a reduction in the daily diclofenac sodium usage in rheumatoid arthritis patients: a pilot study
Effect of cod liver oil on symptoms of rheumatoid arthritis.
Properties
Platelet Aggregation Inhibitors/Anticoagulant
Early studies suggest that consuming cod liver oil can have significant effects on blood clotting. These studies, conducted primarily on healthy volunteers, indicate a prolongation of bleeding time by up to 81%, a reduction in platelet aggregation induced by thrombin, ADP, or collagen, and a decrease in the production of thromboxane B2 by platelets in response to thrombin. The consumption of cod liver oil is also associated with a reduction in the synthesis of thromboplastin, a key enzyme in the coagulation cascade. The clinical impact of these changes on platelet aggregation and bleeding times, however, remains uncertain.
Effects of dietary supplementation with cod liver oil on monocyte thromboplastin synthesis, coagulation and fibrinolysis
Alteration and recovery of bleeding times, platelet aggregation and fatty acid composition of individual phospholipids in platelets of human subjects receiving a supplement of cod-liver oil
Anti-inflammatory
Rich in omega-3 fatty acid EPA, cod liver oil plays a notable role in modulating inflammatory responses. This oil inhibits the conversion of arachidonic acid into inflammatory prostaglandins and leukotrienes, and serves as a precursor to series 3 prostaglandins and series 5 leukotrienes, which are less inflammatory. These anti-inflammatory properties of cod liver oil are garnering increased interest, particularly in sports contexts to reduce exercise-induced inflammation. An observational study among amateur athletes revealed that regular cod liver oil consumption is associated with lower levels of C-reactive protein, an inflammation marker, both before and after a 91-kilometer cycling race, compared to no or occasional consumption.
Usages associés
Cardiovascular
Cod liver oil consumption effectively reduces blood glucose levels, improves lipid profiles, and lowers high-sensitivity C-reactive protein (hs-CRP) levels, an inflammation marker according to a study. The study also highlights a reduction in insulin resistance, measured by HOMA-IR, in patients taking cod liver oil. These results suggest potential benefits of cod liver oil in managing metabolic and inflammatory complications related to gestational diabetes.
Usages associés
Safety dosage
Adult from 18 years: 10 mL - 20 mL (oil)
Cod liver oil is most often used at a rate of 10 to 20 ml per day for a period of up to 4 months.
Pregnant woman: 10 mL (oil)
In the context of clinical research, cod liver oil, at a rate of 10 ml per day orally (providing 1,170 mcg of vitamin A and 10 mcg of vitamin D per day), has been used safely from week 17 of pregnancy until delivery, and for 3 months during the breastfeeding period.
Breastfeeding woman: 10 mL (oil)
Cod liver oil, at a rate of 10 ml per day, can be consumed safely during breastfeeding.
Infant from 6 to 12 months: 2.5 mL (oil)
In clinical studies, children aged 6 months to 1 year received 2.5 ml of cod liver oil per day safely for 5 months.
Child from 1 to 5 years: 5 mL (oil)
Children aged 1 year to 5 years received 5 ml daily safely for 5 months.
Interactions
Médicaments
Antiplatelet agents/Anticoagulant: low interaction
High doses of cod liver oil (20-40 ml) are associated with an increase in bleeding time and a reduction in blood clotting.
Antihypertensive: low interaction
Cod liver oil has a hypotensive effect, its combination with antihypertensive drugs could intensify the effects.
