Raw liver is not safe to eat. It carries a real risk of bacterial infection, parasitic disease, and in the case of pork liver, hepatitis E. While some wellness communities promote raw liver for its dense nutrient profile, food safety agencies uniformly recommend cooking all organ meats to safe internal temperatures before eating them.
Bacterial Contamination in Raw Liver
Raw liver can harbor Campylobacter, E. coli, Listeria, and Salmonella. These bacteria don’t change the look, smell, or taste of the meat, so there’s no way to tell whether a piece of liver is contaminated without lab testing. Chicken liver is particularly risky because Campylobacter can live not just on the surface but deep inside the tissue, meaning that searing the outside won’t necessarily kill what’s inside.
The U.S. Department of Agriculture recommends cooking all poultry products, including chicken liver, to an internal temperature of at least 165°F (73.9°C), measured with a food thermometer. Beef and pork liver should reach 160°F. These temperatures are high enough to kill the major foodborne bacteria. A liver that’s still pink or creamy in the center, which is how many chefs prefer to serve it, may not have reached that threshold throughout.
Hepatitis E From Pork Liver
Pork liver carries a unique viral risk that beef and chicken do not: hepatitis E. The virus circulates widely in pig populations and concentrates in liver tissue. A CDC-documented case in France traced a hepatitis E infection directly to raw pork liver sausage (figatellu), a traditional Corsican product made with 30% pork liver and no heating step during production. Genetic sequencing confirmed a 100% match between the virus in the sausage and the virus in the patient’s blood.
In that same case, the patient’s daughter also tested positive for hepatitis E but had no symptoms, illustrating that the virus can spread through food without the infected person realizing it. For most healthy adults, hepatitis E resolves on its own, but it can cause serious liver damage in pregnant women and people with weakened immune systems or preexisting liver disease. Any pork liver product that hasn’t been thoroughly cooked poses this risk.
Parasites That Target the Liver
Raw or undercooked liver from cattle, sheep, and other livestock can contain liver flukes, parasitic worms that infect the liver, gallbladder, and bile ducts. Once inside your body, these parasites can survive for 5 to 25 years if untreated. Early symptoms include nausea, abdominal pain, fever, diarrhea, and muscle aches. Left unchecked, a chronic infection can lead to liver scarring, bile duct inflammation, and in some cases bile duct cancer.
Liver flukes can also migrate beyond the liver to the pancreas, lungs, skin, eyes, and even the brain. Fascioliasis, the most common type in livestock, is more prevalent in animals than humans, but eating raw liver from an infected animal is a direct route of transmission. Freezing doesn’t reliably kill all parasitic species, and visual inspection of the meat won’t reveal microscopic cysts or larvae.
Heavy Metals and Vitamin A Overload
Even when pathogens aren’t a concern, liver concentrates substances that can be harmful in excess. The liver is a filtering organ, and it accumulates trace metals at much higher levels than muscle meat. A study of 152 Australian sheep found that liver tissue contained an average of 66 mg/kg of copper and 0.28 mg/kg of cadmium, compared to just 0.74 mg/kg of copper and 0.0035 mg/kg of cadmium in muscle. While these levels fell within acceptable safety ranges for occasional consumption, eating liver frequently or in large portions pushes you closer to toxic thresholds, especially for copper.
Liver is also extraordinarily rich in preformed vitamin A. A single 100-gram serving of beef liver contains roughly 5 to 10 times the daily recommended intake. Occasional consumption is fine for most people, but regular large servings can cause vitamin A toxicity, with symptoms ranging from headaches and nausea to liver damage and, in pregnant women, birth defects. This risk applies whether the liver is cooked or raw, but people who eat raw liver as a “superfood” supplement tend to consume it more frequently, compounding the exposure.
Does Freezing Make Raw Liver Safer?
Freezing reduces pathogen counts but does not eliminate them. Research from the UK Food Standards Agency found that freezing chicken livers at -25°C for 24 hours reduced Campylobacter levels by up to 100-fold. A double freeze cycle, freezing for 24 hours, thawing in the fridge, then freezing again for another 24 hours, achieved up to a 1,000-fold reduction. That sounds dramatic, but it still leaves viable bacteria behind if the starting contamination was high enough.
Freezing is more effective against certain parasites. The FDA’s guidelines for fish, for example, use deep freezing to kill parasitic worms. But bacteria like Salmonella and Listeria can survive freezer temperatures indefinitely, entering a dormant state and reactivating once the food thaws. For liver specifically, no freezing protocol has been validated as a substitute for cooking.
What About Liver Supplements?
Freeze-dried raw liver capsules and powders have become popular as a way to get liver’s nutritional benefits without cooking it. These products are typically made by desiccating raw liver at low temperatures, which preserves vitamins but does not reliably eliminate pathogens. The drying process reduces moisture, making it harder for bacteria to multiply, but organisms like Salmonella are known to survive in low-moisture environments for months. Whether a specific product is safe depends entirely on the manufacturer’s sourcing and testing protocols, neither of which is standardized or regulated in the way that cooking temperatures are.
If you want the nutritional benefits of liver, cooking it thoroughly eliminates the infection risks while preserving most of the iron, B vitamins, and other nutrients that make liver valuable in the first place. Vitamin A and most minerals are heat-stable, so you lose very little by cooking. A quick sauté to an internal temperature of 165°F for poultry liver or 160°F for beef and pork liver gives you the nutrition without the gamble.