Herb & supplement monograph

Liver Extract Drug Interactions, Uses, Effectiveness, Safety & More

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS ·Updated July 2026

What is this page for?

First and foremost: how Liver Extract interacts with medications. The heart of this page is the interaction list — every drug Liver Extract is known to interact with, and how serious each one is.

But these pages have grown well beyond that into a full monograph — what Liver Extract is, what people use it for and how strong the evidence is, its safety and side effects, and answers to the questions we’re asked most — written and reviewed by the clinical staff at HelloPharmacist. It’s educational information from our licensed clinical databases, not medical advice, and we don’t sell or endorse products. Our editorial policy

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Liver Extract Drug Interactions: The Bottom Line

From the HelloPharmacist Editorial Team · Updated July 2026

Based on the available evidence, the overall risk of a clinically significant Liver Extract drug interaction appears low for most people. Only a small handful of medications are listed, none of the interactions are rated major or moderate, and all are considered minor.

Interactions deserving the most attention

The combination most worth understanding involves warfarin. Liver extract can contain small, variable amounts of vitamin K, which in theory could weaken warfarin's blood-thinning effect if you start, stop, or greatly change how much you take. This has not actually been studied or reported in people, but because warfarin requires steady INR levels, consistency matters. The other point is iron: liver extract naturally contains heme iron, so pairing it with iron-containing medicines or supplements adds to your total iron intake. That mainly matters with high doses, long-term use, or an iron-overload condition such as hemochromatosis.

What the rest of the list means

It helps to know that these concerns are largely theoretical, based on what liver extract naturally contains rather than on documented problems in people. Neither interaction has been confirmed in human studies, and for most people taking typical amounts, no meaningful effect is expected.

Check your medications against Liver Extract

Based on HelloPharmacist’s Liver Extract interaction data and reviewed under our editorial standards.

Interaction report

Drugs that interact with Liver Extract

3 medications have a known interaction with Liver Extract, graded by severity. Select any drug for the full evidence-based detail.

Don’t want to scroll the list? Just ask.

Tell us the medications you take and we’ll check each one against Liver Extract using our pharmacist-reviewed interaction data.

AI summaries are generated from our Liver Extract interaction data for education only — always confirm with your pharmacist. How we use AI

2,830 drugs

Read The List Like a Pharmacist

What Severity, Likelihood & Evidence Mean

Severity — How Serious It Can Be

Major. Clinically significant; generally best avoided, or used only under direct professional supervision.
Moderate. May need monitoring, a dose adjustment, or separating the times you take each one.
Minor. Generally not clinically significant, but still worth noting and mentioning to your pharmacist.
No known interaction. Checked against our sources with nothing documented — not the same as proven safety.

Likelihood — How Well It’s Documented

Likely. Well-controlled human studies have demonstrated the likely existence of this interaction
Probable. Interaction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
Possible. Interaction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists
Unlikely. Interaction has been demonstrated in animal or in lab research but has been shown not to occur in humans.

Where This Data Comes From

Interaction records are evidence-graded and sourced from the Natural Medicines database (TRC Healthcare), the same reference used by pharmacists and hospitals.
Each drug listed above links to the full report for that exact Liver Extract combination — clinical detail, likelihood, evidence level, and citations.
Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

The big picture

The kinds of drugs Liver Extract affects

Every type of medication (drug category) Liver Extract is known to interact with. Open any category for the detail — or search your exact drug in the checker above.

All 2 drug categories Liver Extract interacts with

IronWarfarin (coumadin)

Iron

Liver extract can contain heme iron. Taking liver extract with iron-containing medications or supplements may increase total iron intake and could increase the risk of gastrointestinal adverse effects or excessive iron accumulation. The risk is greater with high doses, prolonged use, or in individuals with hemochromatosis or another iron-overload disorder. Review the iron content of the liver extract and the total elemental iron dose. Avoid unnecessary duplicate iron supplementation and consider monitoring ferritin and transferrin saturation when clinically appropriate.

Likelihood Possible Evidence D

Warfarin (Coumadin)

Liver extract products may contain small and variable amounts of vitamin K. Theoretically, starting, stopping, or substantially changing the amount of liver extract used could reduce the anticoagulant effect of warfarin and lower the INR. However, this interaction has not been directly studied or reported in humans, and the vitamin K content of liver extract products is generally not standardized. Consider monitoring the INR after a meaningful change in liver extract use.

Likelihood Possible Evidence C

Monograph

Liver Extract: Uses, Safety & Side Effects

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS · Reviewed July 2026 ·

The bottom line

Liver extract is a dried or concentrated form of animal liver that is naturally rich in iron, vitamin B12, vitamin A, and other nutrients. It was once used to treat certain anemias before purified vitamins became available, but today there is little modern evidence that it offers benefits beyond what a balanced diet or standard supplements provide. Talk with your pharmacist or doctor before using it, especially if you are pregnant, have liver disease, or have iron overload conditions.

Part used: Liver tissue, usually from cattle (beef) or pork
Common forms: Capsules, tablets, powders, desiccated (dried) liver supplements, and injectable forms (prescription/historical)

People commonly use it for

Anemia and low iron
Vitamin B12 support
General energy and fatigue
Nutritional support for athletes
Liver health support

Popular and traditional uses — not proof it works. See “Uses & effectiveness” below for the evidence.

Safety at a glance

OverallUse caution

Generally low risk for healthy adults in food amounts, but it can deliver high levels of vitamin A and iron and carries source-quality concerns.

PregnancyInsufficient reliable information

Insufficient reliable information available; avoid using.

Read the full pregnancy detail

BreastfeedingInsufficient reliable information

Insufficient reliable information available; avoid using.

Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center). Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Jump to a section

Overview

Liver extract is a supplement made from the liver of animals, most often cattle (beef) or pigs. The liver is dried, defatted, or otherwise processed to make a concentrated powder that is put into capsules, tablets, or loose powder. Because liver is one of the most nutrient-dense organs in the body, these products are naturally high in iron, vitamin B12, vitamin A, folate, and other vitamins and minerals.

Historically, liver and liver extract played a famous role in medicine. Before purified vitamin B12 was available, eating large amounts of liver or receiving liver extract injections was a standard treatment for pernicious anemia, a serious B12-deficiency condition. Today, that role has been replaced by purified vitamins and prescription medicines.

Now, liver extract is mostly sold as a dietary supplement marketed for energy, iron support, and "whole food" nutrition. Some products are labeled as "desiccated liver" and are popular with athletes and people following ancestral or whole-food diets.

How it works

Liver extract does not work through a single "active herb" compound. Instead, its possible benefits come from the concentrated nutrients it naturally contains.

The most notable are vitamin B12 and iron, which the body needs to make healthy red blood cells. A shortage of either can cause anemia, fatigue, and weakness, so supplying them can help correct a true deficiency. Liver also provides vitamin A, folate, riboflavin, copper, and choline, all of which support normal body functions.

Because these nutrients come in a food-based form, some people believe they are better absorbed, but this is not clearly proven. It is important to understand that getting nutrients you are not actually low in does not usually create extra benefit and can sometimes cause harm if levels get too high.

Effectiveness

Does Liver Extract work?

Here’s what the research actually shows for each use — graded by Natural Medicines and reviewed by Dr. Brian Staiger, PharmD.

Evidence overview · 3 uses evaluated

1 Leans ineffective 2 Insufficient evidence

How to read these evidence grades

Natural Medicines’ 7-point scale. We show each rating’s label word-for-word.

1EffectiveStrong, consistent evidence it works.

2Likely EffectiveGood evidence, though not yet conclusive.

3Possibly EffectiveSome evidence suggests a benefit.

4Possibly IneffectiveSome evidence it may not help.

5Likely IneffectiveFairly strong evidence it doesn’t help.

6IneffectiveStrong evidence it doesn’t work.

7Insufficient Reliable Evidence to RateToo little research to say either way.

Possibly Ineffective Chronic fatigue syndrome (CFS)

Rating & evidence shown verbatim from Natural Medicines

Daily injections of a combination of folic acid, bovine liver extract, and cyanocobalamin for 3 weeks appear to have no effect on CFS symptoms.

Sources Ref 7561

Also studied for 2 conditions — evidence insufficient to rate

Insufficient Reliable Evidence to Rate General nutritional support

By HelloPharmacist Editorial Staff · Editorial policy

Depending on how it is manufactured, bovine liver extract may provide iron, vitamin B12, vitamin A, folate, copper, and other nutrients naturally found in liver. However, the amounts and composition can vary considerably between products and may not be standardized or fully disclosed. Reliable clinical research has not established that liver extract improves overall nutritional status, energy, or general health in otherwise healthy individuals. It should not be considered a dependable substitute for a balanced diet or for targeted supplementation of a documented nutrient deficiency.

Sources https://pubmed.ncbi.nlm.nih.gov/33148079/ https://pmc.ncbi.nlm.nih.gov/articles/PMC5355581/

Insufficient Reliable Evidence To Rate Hepatitis C

Rating & evidence shown verbatim from Natural Medicines

Preliminary clinical research suggests that intravenous treatment with liver extract plus flavin adenine dinucleotide improves response to interferon-beta therapy in patients with hepatitis C. Also, giving a specific combination of liver extract and flavin adenine dinucleotide (Adelavin) intravenously or intramuscularly appears to improve hepatitis C virus RNA levels in patients with hepatitis C who are being treated with interferon-alpha compared with those being treated with interferon-alpha alone. Researchers have attributed this effect to enhancement of 2'5'-oligoadenylate synthetase production.

Sources Ref 59952 Ref 59964

Source & disclaimer. Effectiveness ratings and evidence summaries are provided by Natural Medicines (Therapeutic Research Center) and shown as licensed. Where Natural Medicines hasn’t rated a use, HelloPharmacist’s pharmacists may add their own reviewed rating and evidence (each such entry is labeled). This is educational information, not medical advice — talk with your pharmacist or doctor before starting, stopping, or changing a supplement.

Safety & precautions

For most healthy adults, liver extract in modest food-like amounts is generally low risk. However, there are several real safety concerns to keep in mind.

Vitamin A overload: Liver is extremely high in preformed vitamin A. Taking too much over time can build up in the body and cause toxicity, with symptoms like headache, dizziness, dry skin, bone pain, and liver damage. This risk is especially important in pregnancy.

Iron overload: People with hemochromatosis or other iron-storage disorders should avoid extra iron unless directed by a doctor, since too much iron can damage organs.

Source and quality: Because it is an animal product, quality depends heavily on the source. Choose products from reputable manufacturers, ideally third-party tested. People who avoid certain animal products for religious or dietary reasons should check the source.

Pregnancy and breastfeeding: Avoid liver extract during pregnancy unless your doctor recommends it, because high vitamin A intake has been linked to birth defects. During breastfeeding, safety is not well studied, so use caution and ask your doctor first. People with gout, kidney disease, or liver disease should also check with a healthcare provider before use.

Side effects

When taken in reasonable amounts, liver extract is usually well tolerated. Possible side effects include upset stomach, nausea, or constipation, often related to the iron content.

With long-term or high-dose use, the bigger concerns are the slow buildup of vitamin A (which can cause toxicity) and iron (which can be harmful in people prone to iron overload). Some people may have allergic reactions to animal-derived products.

Stop use and seek medical care if you notice severe headache, vision changes, persistent nausea, joint or bone pain, yellowing of the skin or eyes, or signs of an allergic reaction.

Liver Extract: Reported Adverse Effects

Documented safety reports on Liver Extract from the evidence-graded Natural Medicines (TRC Healthcare) database, shown word-for-word from the licensed record.

No adverse reactions have been reported. However, a thorough evaluation of safety outcomes has not been conducted, There is some concern about the possibility of contamination as liver extract is derived from raw animal liver gathered from slaughterhouses, possibly from sick or diseased animals. There is also concern that liver extracts produced from cows in countries where bovine spongiform encephalitis (BSE) has been reported might be contaminated with diseased tissue.

Lewis CJ. Letter to reiterate certain public health and safety concerns to firms manufacturing or importing dietary supplements that contain specific bovine tissues. FDA. Available at: www.cfsan.fda.gov/~dms/dspltr05.html.

Reports by condition

Encephalitis Immunologic

There is concern that liver extracts produced from cows in countries where bovine spongiform encephalitis (BSE) has been reported might be contaminated with diseased tissue. Countries where BSE has been reported include Great Britain, France, The Netherlands, Portugal, Luxembourg, Ireland, Switzerland, Oman, and Belgium. However, there have been no reports of BSE transfer to humans from contaminated liver extract products. Until more is known, tell patients to avoid these products unless the country of origin can be determined. Patients should avoid products that are produced in countries where BSE has been found.

Lewis CJ. Letter to reiterate certain public health and safety concerns to firms manufacturing or importing dietary supplements that contain specific bovine tissues. FDA. Available at: www.cfsan.fda.gov/~dms/dspltr05.html.

DISCLAIMER: This tool is intended for informational purposes only, and should not be interpreted as specific medical advice. Patients should consult with a qualified healthcare provider before making decisions about therapies and/or health conditions.

Adverse-effects data: Natural Medicines, Therapeutic Research Center

Dosing

There is no official, standardized dose of liver extract, and products vary widely in how concentrated they are. Different brands also contain different amounts of vitamin A, iron, and B12.

The safest approach is to follow the dose on the product label and not exceed it. Because liver is so rich in vitamin A and iron, taking more than recommended can be harmful rather than helpful.

Before starting, talk with your pharmacist or doctor—especially if you are pregnant, breastfeeding, take other vitamin or iron supplements, or have a health condition. They can help you decide whether you actually need it and whether a standard, purified vitamin would be a safer, more reliable choice.

Pregnancy & Breastfeeding

Liver Extract & Pregnancy

Insufficient reliable information

Insufficient reliable information available; avoid using.

Liver Extract & Breastfeeding

Insufficient reliable information

Insufficient reliable information available; avoid using.

Pregnancy & lactation ratings: Natural Medicines, Therapeutic Research Center

References & further reading

The 4 references that drive our Liver Extract monograph and interaction data, from the evidence-graded Natural Medicines (TRC Healthcare) database. Citations with a link open the study on PubMed or the publisher’s site.

Lewis CJ. Letter to reiterate certain public health and safety concerns to firms manufacturing or importing dietary supplements that contain specific bovine tissues. FDA. Available at: www.cfsan.fda.gov/~dms/dspltr05.html.
Kaslow JE, Rucker L, Onishi R. Liver extract-folic acid-cyanocobalamin vs placebo for chronic fatigue syndrome. Arch Intern Med 1989;149:2501-3. DOI
Ebinuma, H., Saito, H., Tada, S., Masuda, T., Kamiya, T., Nishida, J., Yoshioka, M., and Ishii, H. Additive therapeutic effects of the liver extract preparation mixture adelavin-9 on interferon-beta treatment for chronic hepatitis C. Hepatogastroenterolog
Saito, H., Ebinuma, H., Tada, S., Tsunematsu, S., Atsukawa, K., Masuda, T., Tsuchiya, M., and Ishii, H. Enhancing effect of the liver extract and flavin adenin dinucleotide mixture on anti-viral efficacy of interferon in patients with chronic hepatitis C. PubMed

Keep reading

This information is for education only and is not a substitute for professional medical advice. Always check with your pharmacist or doctor before starting, stopping, or combining supplements and medications.

Parts of this content are provided by the Therapeutic Research Center, LLC.

DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.

Brand directory

Brands that make products with Liver Extract

107 brands in our database make a supplement containing Liver Extract.

AB American Biologics 76 products Allergy Research Group 1,595 products Ancestral Supplements 59 products Ancient Nutrition 389 products Animal 139 products Arnold Schwarzenegger Series 1 product aSquared Nutrition 96 products B.E.S.T. Process Alka-Line Supplements 29 products Basic Organics 14 products BioAnue 114 products BioGenesis Nutraceuticals 87 products Biotics Research Corporation 250 products Bloomeo 1 product BodyHealth 60 products Bronson 657 products Bronson Laboratories 446 products Cardiovascular Research 194 products Carlson 2,128 products Carlyle 5 products Codeage 203 products CurEase 66 products DC 1,641 products DNA Dynamic Nutritional Associates 30 products Douglas Laboratories 3,067 products

Product directory

Supplement products with Liver Extract

639 products in our database contain Liver Extract. Open any to see its full ingredient list and every drug interaction we check.

Pharmacist Counseling Corner

Liver Extract: Common Questions

What is Liver Extract used for, and does it work?

People use Liver Extract for a range of reasons, but according to the Natural Medicines database the current clinical evidence is insufficient to confirm it works for the specific conditions it has been studied for. See the graded list on this page, and talk to your pharmacist or doctor before relying on it for any condition.

Does Liver Extract interact with prescription medications?

Yes. We list 3 medications with a known interaction with Liver Extract. Use the checker above to see how Liver Extract interacts with a specific drug.

How are Liver Extract interactions rated?

Each interaction is graded major, moderate, or minor based on how clinically significant it is and the strength of the evidence behind it. Major interactions are the most serious and are best avoided, or used only under close professional supervision.

Is it safe to take Liver Extract with my medications?

It depends on the specific medication. Some combinations are fine, while others call for monitoring, timing changes, or should be avoided. Check your exact drug above and confirm with your pharmacist or doctor before starting, stopping, or changing anything.

Where does this Liver Extract interaction information come from?

Our interaction data is built on the Natural Medicines database — an evidence-graded reference for vitamins, herbs, and supplements — and is reviewed by licensed HelloPharmacist pharmacists, who may add clinical context.

What is Liver Extract used for?

It is popularly used for low iron, vitamin B12 support, energy, and general nutrition because liver is naturally rich in these nutrients. Historically it was used to treat certain anemias, but purified vitamins have largely replaced it.

Is Liver Extract safe to take?

For healthy adults, modest amounts are generally low risk, but it is very high in vitamin A and iron, which can build up and cause harm with too much use. Choose reputable, third-party tested products and check with your pharmacist first.

Can I take Liver Extract while pregnant?

It is best to avoid it during pregnancy unless your doctor specifically recommends it, because the high vitamin A content has been linked to birth defects.

Is Liver Extract better than a regular vitamin?

There is little good evidence that it works better than a balanced diet or standard purified vitamins. Standard supplements also let your doctor give a known, controlled dose, which is usually preferred.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

Keep exploring

Products that contain Liver Extract

A rotating sample of real supplements in our database that list Liver Extract — open any to see its full ingredients and every drug interaction we check.

See all 639 products with Liver Extract →

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Liver Extract Drug Interactions, Uses, Effectiveness, Safety & More

Your Choice:

Liver Extract Drug Interactions: The Bottom Line

Drugs that interact with Liver Extract

Don’t want to scroll the list? Just ask.

What Severity, Likelihood & Evidence Mean

Severity — How Serious It Can Be

Likelihood — How Well It’s Documented

Where This Data Comes From

The kinds of drugs Liver Extract affects

Liver Extract: Uses, Safety & Side Effects

Overview

How it works

Does Liver Extract work?

Safety & precautions

Side effects

Liver Extract: Reported Adverse Effects

Dosing

Liver Extract & Pregnancy

Liver Extract & Breastfeeding

References & further reading

Brands that make products with Liver Extract

Supplement products with Liver Extract

Liver Extract: Common Questions

Related supplements & herbs

Products that contain Liver Extract

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