COD LIVER OIL: Overview, Uses, Side Effects, Precautions, Interactions, Dosing and Reviews

Overview

Cod liver oil can be obtained from eating fresh cod liver or by taking supplements. It is a source of vitamins A and D and a fat called omega-3.

Cod liver oil contains certain "fatty acids" that prevent the blood from clotting easily. These fatty acids also reduce pain and swelling.

Cod liver oil is used for heart health, depression, arthritis, and many other conditions, but there is no good scientific evidence to support these uses.

Uses & Effectiveness

Likely Effective for

Lowering blood fats called triglycerides. Taking cod liver oil by mouth can reduce triglyceride levels by 20% to 50% in people with high triglyceride levels.

Possibly Effective for

High blood pressure. Taking cod liver oil by mouth seems to lower blood pressure (both numbers) a small, but important, amount in people with mild high blood pressure.
Kidney disease in people with type 2 diabetes. Taking cod liver oil seems to reduce protein in the urine, a marker for kidney disease severity.

Possibly Ineffective for

Coronavirus disease 2019 (COVID-19). Taking cod liver oil by mouth does not seem to help prevent COVID-19.

There is interest in using cod liver oil for a number of other purposes, but there isn't enough reliable information to say whether it might be helpful.

Side Effects

When taken by mouth: Cod liver oil is likely safe for most adults. It can cause side effects including heartburn, stomach upset, and nausea. High doses of cod liver oil are possibly unsafe. They might keep blood from clotting and can increase the chance of bleeding. Vitamin A and vitamin D levels might also become too high with high doses of cod liver oil.

When applied to the skin: There isn't enough reliable information to know if cod liver oil is safe or what the side effects might be.

Special Precautions and Warnings

Pregnancy and breast-feeding: Cod liver oil is possibly safe when used in amounts that provide no more than the recommended daily intakes of vitamin A and vitamin D. Cod liver oil is possibly unsafe when taken in larger amounts. Do not take cod liver oil that provides more than about 3000 mcg of vitamin A and 100 mcg of vitamin D when pregnant or breast-feeding.

Children: Cod liver oil is likely safe for most children when taken by mouth in amounts that provide no more than the recommended daily intakes of vitamin A and vitamin D. Cod liver oil is possibly unsafe when taken in larger amounts.

Diabetes: Cod liver oil or other fish oils might increase blood sugar in people with diabetes, but it's not clear if this is a major concern. Cod liver oil might also lower blood sugar levels and increase the effects of some antidiabetes drugs. If you have diabetes and use cod liver oil, monitor your blood sugar levels closely.

Interactions

Moderate Interaction

Be cautious with this combination

Medications for high blood pressure (Antihypertensive drugs) interacts with COD LIVER OIL
Cod liver oil might lower blood pressure. Taking cod liver oil along with medications that lower blood pressure might cause blood pressure to go too low. Monitor your blood pressure closely.
Medications that slow blood clotting (Anticoagulant / Antiplatelet drugs) interacts with COD LIVER OIL
Cod liver oil might slow blood clotting. Taking cod liver oil along with medications that also slow blood clotting might increase the risk of bruising and bleeding.
Medications for diabetes (Antidiabetes drugs) interacts with COD LIVER OIL
Cod liver oil might lower blood sugar levels. Taking cod liver oil along with diabetes medications might cause blood sugar to drop too low. Monitor your blood sugar closely.

Dosing

Cod liver oil has most often been used by adults in doses of 15-20 mL by mouth daily for up to 4 months. Speak with a healthcare provider to find out what dose might be best for a specific condition.

View References

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COD LIVER OIL - Uses, Side Effects, and More