Is Raw Milk Safe? Risks, Benefits, and What Pasteurization Actually Does

Raw milk carries real pathogen risk. Pasteurization significantly reduces that risk. Those two facts are not disputed by serious researchers on either side of the debate. What is genuinely disputed is how large the absolute risk is, whether pasteurization destroys meaningful nutritional content, and whether the context matters: specifically, whether milk from your own well-managed dairy animals carries the same risk as commercially distributed raw milk from a farm you have never visited.

This article covers what the research actually says, sources it to the CDC, FDA, and peer-reviewed literature, and gives homesteaders the information they need to make an informed decision for their own families.

The Risk Side: What the Data Actually Says

The CDC and FDA are unambiguous on the pathogen risk. Raw milk can harbor Salmonella, E. coli O157:H7, Listeria monocytogenes, Campylobacter, Cryptosporidium, and Brucella. These are not theoretical contaminants: they have caused documented outbreaks, hospitalizations, and deaths.

Between 1998 and 2018, the CDC documented 202 outbreaks linked to raw milk consumption in the US, resulting in 2,645 illnesses and 228 hospitalizations. A 2017 study published in Emerging Infectious Diseases, a CDC-affiliated journal, estimated that unpasteurized dairy products cause approximately 840 times more outbreak-related illnesses per billion servings than pasteurized products. The authors found that unpasteurized dairy, consumed by only about 3.2% of the population at the time, accounted for 96% of dairy-related illness outbreaks.

Some important context around that 840-times figure: it is a modeled estimate based on outbreak surveillance data, not a direct measurement of individual risk per person per glass. A separate analysis using updated consumption data estimated the per-consumer raw milk illness rate at approximately 1 in 15,000 per year. That number is meaningfully higher than the risk from pasteurized dairy, but it is not the same as saying anyone who drinks a glass of raw milk is likely to get sick.

Who faces the most serious risk matters enormously in this conversation. The CDC identifies children under 5, adults over 65, pregnant women, and people with weakened immune systems as facing significantly higher risk of severe outcomes from raw milk pathogens, including Guillain-Barre syndrome, hemolytic uremic syndrome, kidney failure, and in Listeria cases in pregnancy, miscarriage, stillbirth, and infant illness or death. The data consistently shows children as the most frequently affected: a 2023 to 2024 Salmonella outbreak linked to raw milk had 70% of cases among children and adolescents under 18, with a median patient age of 7 years.

For healthy adults with no immunocompromising conditions, the risk profile is different and lower, though not zero. For households with children, elderly members, or pregnant women, the public health evidence points clearly toward pasteurization.

The Benefit Claims: What Research Actually Supports

Raw milk advocates make several claims about the health benefits of unprocessed milk. It is worth examining each one against the evidence rather than dismissing or accepting them wholesale.

Claim: Raw Milk Retains Beneficial Enzymes Destroyed by Pasteurization

This claim is partially accurate but its significance is disputed. LTLT pasteurization at 145°F does deactivate alkaline phosphatase and lactoperoxidase, among other heat-sensitive enzymes present in raw milk. The question is whether these enzymes provide meaningful health benefits when consumed by humans.

The scientific consensus, as summarized by the American Society for Microbiology and the FDA, is that the enzymes present in cow's milk are bovine enzymes produced for bovine physiology. They are largely denatured in the human digestive system regardless of whether the milk was pasteurized, and there is no strong clinical evidence that consuming them in their intact state produces measurable health benefits in humans. The FDA states that scientists do not believe these enzymes are important in human health in the quantities present in milk.

A 2025 peer-reviewed review in PMC concluded that "while pasteurization has a minimal effect on lactose intolerance and may slightly alter allergenicity and immune factors, current evidence does not support claims that raw milk improves these conditions" and that "the loss of natural components is often outweighed by the reduction in foodborne illness risk."

Claim: Raw Milk Is Easier to Digest for Lactose-Intolerant People

This is one of the most frequently cited raw milk benefits and one of the best-studied. A randomized controlled trial compared raw milk, pasteurized milk, and soy milk in adults who tested positive for lactose malabsorption and found that raw milk did not reduce lactose malabsorption symptoms compared with pasteurized milk. The proposed mechanism, that native bacterial lactase in raw milk aids digestion, was not supported. Raw milk does not contain meaningful amounts of free lactase, and the bacteria that produce it are present in concentrations too low to affect digestion before the milk is consumed.

Claim: Pasteurization Destroys Significant Nutritional Value

The evidence here is mixed and depends significantly on what "significant" means. LTLT pasteurization at 145°F causes measurable but modest changes:

• Vitamin C is reduced by approximately 10 to 25%, though raw milk is not a meaningful dietary source of vitamin C regardless
• Some heat-sensitive whey proteins are partially denatured, though casein (which makes up about 80% of milk protein) is heat-stable and essentially unaffected; a cup of pasteurized milk still contains 8 grams of protein
• Calcium, potassium, and most B vitamins are essentially unchanged by LTLT pasteurization
• Immunoglobulin concentrations are reduced, though a 2025 PMC review found that immunoglobulin concentration in cow's milk is too low to have physiological significance in human immunity regardless of pasteurization

Ultra-high-temperature (UHT) pasteurization at 280 degrees Fahrenheit, used for shelf-stable commercial milk, causes more extensive protein denaturation and is not the same process as LTLT pasteurization at 145°F. The nutritional comparisons made by raw milk advocates often conflate UHT processing with standard LTLT pasteurization, which is a meaningful error.

Claim: Raw Milk Protects Against Allergies

Some epidemiological studies, particularly European studies of farm children, have found associations between raw milk consumption and lower rates of allergic conditions including asthma. The GABRIELA study and PARSIFAL study found these associations in European farm children who consumed raw milk from their family farms. However, epidemiological association is not causation, and researchers note that farm children differ from non-farm children in many ways beyond raw milk consumption (outdoor exposure, animal contact, diet, stress) that may independently affect allergy risk. Randomized controlled trials testing raw milk specifically against pasteurized milk for allergy outcomes have not been conducted due to ethical constraints around feeding raw milk to children in a trial setting. The allergy research is genuinely interesting and ongoing, but not yet at the level of clinical evidence that would support recommending raw milk consumption for allergy prevention.

The Variable the Data Often Cannot Account For: Source Quality

The population-level risk statistics on raw milk come largely from commercially distributed raw milk and from farms where an unknown consumer has no visibility into animal health, barn hygiene, milking practices, or refrigeration handling. The pathogen contamination risk in raw milk correlates directly with udder health (mastitis dramatically increases bacterial load), barn cleanliness, milking equipment sanitation, and how quickly milk is cooled after collection.

A homesteader who milks two healthy dairy goats in a clean barn, runs the milk through a properly sanitized separator immediately after collection, pasteurizes at 145°F the same morning, and refrigerates within the hour is operating in a fundamentally different risk environment than a commercial raw milk distribution network where milk passes through multiple handling steps before reaching a consumer days later.

This does not eliminate risk. Healthy animals can still carry pathogens asymptomatically, and a single contamination event in a small dairy can sicken a household just as a commercial outbreak can sicken hundreds. But the honest acknowledgment of context matters for the homesteader making a decision about their own family.

Who Should Not Drink Raw Milk

Regardless of milk source or dairy management quality, the CDC, FDA, and American Academy of Pediatrics are clear on which groups face disproportionate risk from raw milk consumption:

• Children under 5: Immature immune systems and higher susceptibility to hemolytic uremic syndrome from E. coli O157:H7. Children are consistently the most affected demographic in raw milk outbreak data.
• Pregnant women: Listeria monocytogenes, which can be present in raw milk, causes miscarriage, stillbirth, and serious illness in newborns even when the pregnant woman shows no symptoms.
• Adults over 65: Reduced immune response increases severity of infection from any foodborne pathogen.
• Immunocompromised individuals: Anyone undergoing chemotherapy, taking immunosuppressive medication (including organ transplant recipients), or living with HIV, diabetes, or other immune-affecting conditions.

What Pasteurization Actually Does (And Does Not Do)

Pasteurization is a heat treatment, not a chemical process. LTLT pasteurization at 145°F for 30 minutes kills the documented pathogens in raw milk without sterilizing it. Pasteurized milk still contains non-pathogenic bacteria and will still spoil. It is not rendered nutritionally inert. It is not equivalent to UHT shelf-stable processing. And it does not, as sometimes claimed, make milk allergenic or nutritionally inferior in any clinically meaningful sense for the vast majority of people.

For homesteaders who want to reduce pathogen risk while maintaining the freshest possible dairy product, LTLT pasteurization at 145°F is the practical middle path. It is gentler than commercial HTST processing at 161°F, preserves the protein structure needed for cheesemaking and yogurt culturing, and eliminates the primary pathogens of concern. The Milky Day FJ pasteurizer line is designed specifically to hold LTLT temperatures automatically, which removes the precision challenge of manual stovetop pasteurization.

For the full pasteurization procedure, including the three methods that work for home dairy, read our guide on how to pasteurize raw milk at home. For equipment guidance, browse the Milky Day dairy equipment collection.

Frequently Asked Questions

Is raw milk safe to drink?

Raw milk carries documented pathogen risk from Salmonella, E. coli O157:H7, Listeria, and Campylobacter. The CDC documented 202 outbreaks linked to raw milk between 1998 and 2018, resulting in 2,645 illnesses and 228 hospitalizations in the US. The risk is not hypothetical. It is lower in absolute terms for healthy adults than the outbreak data might suggest, with one analysis estimating a per-consumer illness rate of approximately 1 in 15,000 per year, but it is meaningfully higher than the risk from pasteurized milk. For children under 5, pregnant women, adults over 65, and immunocompromised individuals, the FDA and CDC recommend against raw milk consumption.

Does pasteurization destroy the nutrients in milk?

LTLT pasteurization at 145°F causes modest and measurable changes: some heat-sensitive enzymes are deactivated, vitamin C decreases by approximately 10 to 25%, and some whey proteins are partially denatured. Casein (80% of milk protein), calcium, potassium, and most B vitamins are essentially unchanged. A cup of pasteurized milk still contains 8 grams of protein and is nutritionally highly similar to raw milk. UHT pasteurization at 280°F causes more extensive changes, but this is a different process than standard LTLT pasteurization. Pasteurized milk is not nutritionally stripped.

Is raw milk from my own animals safer than store-bought raw milk?

Potentially, but not certainly. The risk in raw milk correlates with animal health, barn sanitation, milking equipment cleanliness, and how quickly milk is cooled after collection. A homesteader with healthy animals, clean practices, and immediate refrigeration operates in a different risk environment than a commercial distribution chain. However, healthy animals can carry pathogens asymptomatically, a single contamination event can cause serious illness, and the risk to high-vulnerability household members (children, elderly, pregnant) remains regardless of source. The safest approach for households with vulnerable members is LTLT pasteurization of all milk before consumption.

Does raw milk help with lactose intolerance?

The available evidence does not support this claim. A randomized controlled trial found that raw milk did not reduce lactose malabsorption symptoms compared with pasteurized milk in adults who tested positive for lactose malabsorption. Raw milk does not contain meaningful amounts of free lactase, and the bacterial lactase proposed as the mechanism is present in concentrations too low to affect digestion before consumption.

What does pasteurization actually kill?

LTLT pasteurization at 145°F for 30 minutes kills the primary pathogens of concern in raw milk: Salmonella, E. coli O157:H7, Listeria monocytogenes, Campylobacter, Brucella, and Mycobacterium tuberculosis. It also kills most other non-pathogenic bacteria present in the milk, which is why pasteurized milk lasts longer in the refrigerator than raw milk. It does not sterilize milk; non-pathogenic bacteria survive and the milk will eventually spoil.

This article covers general information about raw milk and pasteurization. It is not medical advice. For guidance specific to your health situation or your household's risk profile, consult a physician or registered dietitian.