Cod liver oil comes from the liver of cod fish. It gives you preformed vitamin A, vitamin D, and the omega-3 fats EPA and DHA. The liver naturally packs in more vitamins A and D than regular fish oil made from fish body tissue.
People use cod liver oil for heart health, joint ease, and immune function. It also helps maintain bones and skin. The omega-3s work against inflammation. Vitamin A supports vision and immune responses. Vitamin D helps the body use calcium properly.
Take cod liver oil with a meal that contains fat so you absorb it well. A typical dose follows the label, often one teaspoon of liquid or the matching capsule amount each day. Brands differ greatly in how much vitamin A, D, and omega-3s they deliver, so check the label for exact numbers.
This oil gives you meaningful amounts of vitamins A and D. Too much for too long can become toxic. Do not add other high-dose vitamin A or D supplements unless a professional guides you. Use caution with blood thinners since omega-3s may raise bleeding risk. Watch for interactions if you take thiazide diuretics, corticosteroids, or have high calcium, sarcoidosis, or a history of kidney stones. Pregnant people should avoid large doses because too much vitamin A can harm fetal development. Check with a healthcare provider before starting, especially before any surgery.