Raw Milk, A2 Milk, and Regular Milk: A Practical Comparison

"Raw milk," "A2 milk," and "regular milk" get talked about like they are three points on the same spectrum, but they are really answering two different questions. Raw versus pasteurized is about processing. A1 versus A2 is about genetics, specifically which version of a milk protein a cow produces. You can find pasteurized A2 milk, raw A1/A2 milk, and everything in between.

In short: pasteurization overwhelmingly reduces the risk of foodborne illness from milk and is recommended by the FDA and CDC, while raw milk carries documented, well-studied safety risks. A2 milk is genetically different from regular milk in one specific protein, and some people who report digestive discomfort with regular milk tolerate A2 milk better, though the research is still developing and not settled.

What is the actual difference between raw milk and regular pasteurized milk?

Pasteurization heats milk briefly to a specific temperature to kill harmful bacteria without cooking the milk. Regular store milk, whether conventional, organic, or grass-fed, is pasteurized unless labeled otherwise. Raw milk skips that step entirely.

Advocates for raw milk say it has better flavor and may retain more of certain heat-sensitive enzymes and some vitamin content, and some people report improved digestion. Those are genuine, if not universally proven, points people care about.

The food-safety side of the ledger is not really disputed among public health agencies. The FDA states plainly that raw milk can carry dangerous pathogens including Salmonella, E. coli, Listeria, and Campylobacter, and that raw milk is unsafe to drink. From 1998 through 2018, the CDC documented 202 outbreaks tied to raw milk consumption in the United States, causing 2,645 illnesses and 228 hospitalizations, numbers that only capture recognized outbreaks and likely understate the true case count since most foodborne illness is never linked back to a specific outbreak. A widely cited 2017 CDC-affiliated analysis found unpasteurized dairy products were linked to roughly 840 times more illnesses and 45 times more hospitalizations than pasteurized dairy, relative to how much of each is consumed.

Children, pregnant women, older adults, and anyone with a weakened immune system are at the highest risk. CDC data shows people under 19 were involved in nearly half of raw milk outbreaks between 2013 and 2018. Good farm hygiene lowers risk but cannot eliminate it, because pathogens can be present in healthy-looking animals and spread during milking even under clean conditions.

What actually makes A2 milk different?

This one is genetic, not a processing choice. Cow's milk contains a protein called beta-casein, and cows carry one of two common genetic variants: A1 or A2. The two forms differ by a single amino acid at position 67 of the protein chain. Most Holstein-type dairy cows, the dominant breed in industrial dairy, produce a mix of A1 and A2 beta-casein. Certain other breeds, and cows specifically selected for it, produce only A2.

The reason this gets attention: when A1 beta-casein is digested, it can release a peptide called beta-casomorphin-7 (BCM-7), an opioid-like compound that some research has linked to digestive discomfort in sensitive people. A2 beta-casein does not release BCM-7 the same way during digestion. A2-only milk companies market their product on the idea that people who feel bloated or uncomfortable after regular milk may tolerate A2 milk better, and some studies, mostly in animals and smaller human trials, support that some people do report easier digestion. But a 2022 scoping review in the journal Nutrients concluded the evidence base is still limited and mixed, and more rigorous human research is needed before strong claims can be made about broader health effects beyond digestive comfort.

Importantly, A2 milk is not a substitute for addressing true lactose intolerance. A2 milk still contains lactose. People who are lactose intolerant react to the milk sugar, not the beta-casein protein, so A2 milk will not solve that particular problem. The people who tend to notice a difference with A2 milk are those who react specifically to the A1 protein, not to lactose.

So which one should you actually choose?

If digestive comfort with regular milk is your concern, trying A2 milk is a low-risk experiment since it is pasteurized and carries the same safety profile as regular milk. If lactose intolerance is the issue, A2 milk will not help, and you likely want a lactose-free or lactase-treated product instead.

Raw milk is a genuinely different decision because it involves a documented, quantified increase in foodborne illness risk that public health agencies are consistent about. If you are pregnant, immunocompromised, feeding young children, or simply want to minimize risk, agencies including the FDA and CDC recommend against it. Some people choose to accept that risk for other reasons, but it should be an informed choice, not one made assuming the risk is overstated.

Frequently Asked Questions

Does raw milk have significantly more nutrients than pasteurized milk?

Pasteurization causes only minor changes to milk's nutrient profile; the loss of some heat-sensitive vitamins is modest, and milk is not a primary dietary source of those particular nutrients anyway. The nutritional gap between raw and pasteurized milk is much smaller than the documented gap in food-safety risk.

Is A2 milk the same as lactose-free milk?

No. A2 milk still contains the milk sugar lactose. Lactose-free milk has had the lactase enzyme added to break down lactose. They solve different problems: A2 milk targets a protein sensitivity, lactose-free milk targets lactose intolerance.

Is raw milk legal everywhere in the US?

No. Interstate sale of raw milk for human consumption has been federally prohibited since 1987. Within states, rules vary widely: some states allow retail sale, some allow only farm-direct or herd-share arrangements, and some prohibit sale entirely. Check your state's specific rules before assuming legality.

Sources

• FDA: The Dangers of Raw Milk
• CDC: Raw Milk
• FDA: Raw Milk Questions & Answers
• Nutrients (PMC): Bovine beta-Casein A1 and A2 Variants and Human Health, An Update
• CDC Emerging Infectious Diseases: Outbreak-Related Disease Burden of Unpasteurized Milk and Cheese, 2009-2014