beef liver

Beef liver supplements are made from dried (desiccated) cattle liver, usually pressed into capsules or tablets and marketed as a whole-food source of the nutrients liver contains. As an organ meat, liver is naturally rich in preformed vitamin A (retinol), vitamin B12, iron, and copper. There is no NIH or NCCIH fact sheet for "beef liver" as a supplement itself, so the points below describe the nutrients liver supplies rather than proven effects of any liver pill.

Rigorous evidence specifically on desiccated beef liver supplements is limited, and no US government health authority publishes an efficacy fact sheet for them. What is well established is that liver is a food source of certain nutrients: NIH lists beef liver among the best sources of vitamin B12 and notes that preformed vitamin A is concentrated in organ meats such as liver. Liver also supplies iron and copper as an animal-source food. Obtaining these nutrients can help correct or prevent a deficiency, but that does not mean a liver supplement treats fatigue, boosts energy, or improves health in people who are not deficient.

There is no established or government-recommended dose for beef liver supplements, and products vary widely in how much vitamin A, iron, and copper they deliver. Because liver is concentrated in preformed vitamin A and iron — both of which have safety ceilings — more is not better, and stacking a liver product with a multivitamin can push intake toward a harmful range. Talk to a clinician or pharmacist before starting, especially if you are pregnant, take other supplements, or have a liver condition; they can check whether you actually need these nutrients.

NIH notes that beef liver is high in cholesterol and advises limiting how much you eat. The biggest concern is preformed vitamin A: getting too much (usually from supplements or certain medicines) can cause severe headache, blurred vision, nausea, dizziness, muscle aches, and problems with coordination, and in severe cases coma and death. Excess preformed vitamin A in pregnancy can cause birth defects, so pregnant people should be especially cautious. Liver also supplies iron, and accidental overdose of iron-containing products is among the leading causes of fatal poisoning in young children, so keep these products out of their reach.

Because liver is dense in preformed vitamin A, regular or high intake can lead to vitamin A excess, with symptoms such as headache, blurred vision, nausea, dizziness, muscle aches, and trouble with coordination. The iron it supplies may cause stomach upset, constipation, or nausea in some people, and too much iron over time can be harmful. Liver also adds dietary cholesterol, which is why NIH advises limiting intake.

Vitamin A from liver can add to other retinoid sources — including prescription retinoid medicines and high-dose vitamin A or multivitamins — raising the risk of vitamin A toxicity. The weight-loss drug orlistat can reduce absorption of fat-soluble vitamins such as vitamin A. The iron in liver can affect the absorption of certain medications and can add to the iron from iron supplements. Tell your clinician about all supplements and medicines you take so doses can be reviewed.