What Milk Does Dr. Gundry Recommend?

Dr. Steven Gundry, the cardiothoracic surgeon and author of The Plant Paradox, recommends milk that contains only A2 beta-casein protein. In practical terms, that means goat milk, sheep milk, water buffalo milk, coconut milk, and cow’s milk from specific heritage breeds or herds certified as A2-only. He advises against conventional cow’s milk from most North American and European dairy breeds, which typically contains a mix of A1 and A2 beta-casein. His reasoning centers on a specific protein fragment released during A1 digestion that he believes triggers gut inflammation, and while the science behind that claim is real, it is also more complicated than his public statements tend to let on.

The A1 Versus A2 Distinction

Most cow’s milk sold in grocery stores comes from Holstein-Friesian cattle, the dominant dairy breed in the United States, Canada, and much of Europe. These cows produce milk containing both A1 and A2 variants of beta-casein, the major protein in milk. The difference between the two comes down to a single amino acid at one position in the protein chain. A2 is considered the older, original form; A1 appeared as a natural mutation in European cattle a few thousand years ago.

When your gut enzymes break down A1 beta-casein, the process can release a peptide called beta-casomorphin-7, or BCM-7. This peptide interacts with opioid receptors in the gut and has been linked in clinical research to slower intestinal transit, increased inflammation markers, and worsened digestive symptoms resembling lactose intolerance. A2 beta-casein, by contrast, does not release BCM-7 during digestion.

This is the core of Gundry’s argument. He treats the A1/A2 split as a bright line: any milk with A1 casein is problematic, while A2-only milk is acceptable. The actual clinical picture is a bit messier, but the basic mechanism is well-documented.

Animal Milks Gundry Favors

Gundry consistently recommends goat milk, sheep milk, and water buffalo milk. The common thread is that all three species naturally produce milk with only A2 beta-casein (or overwhelmingly A2-type variants), meaning they sidestep the BCM-7 issue entirely without any special breeding or certification.

Goat milk has additional features that make it appealing beyond casein type. Its A2 beta-casein fraction is rich in essential amino acids, particularly the branched-chain amino acids leucine, valine, and isoleucine, which are valued for muscle maintenance and energy metabolism.

Water buffalo milk is less familiar to most North Americans but widely consumed globally. It naturally contains only A2 beta-casein and is notably higher in total protein, fat, calcium, and phosphorus than standard cow’s milk. It also has elevated levels of antioxidant vitamins like A, C, E, and B12, along with bioactive peptides that show anti-inflammatory and antioxidant properties in lab studies.

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Sheep milk fits the same pattern: naturally A2, higher in fat and protein than cow’s milk, and commonly used in cheeses like Pecorino Romano and Roquefort. Gundry often mentions these cheeses as acceptable dairy products in his dietary plans.

For people who want to stick with cow’s milk, Gundry points to A2-certified brands, which come from cows that have been genetically tested to confirm they carry only the A2 variant. Certain heritage breeds like Jersey, Guernsey, and many Asian and African cattle breeds also tend to produce predominantly A2 milk, though individual testing is the only way to be sure.

Plant-Based Milks in Gundry’s Framework

Gundry’s dietary philosophy extends well beyond casein. His broader concern is lectins, a class of plant proteins he argues cause intestinal permeability and inflammation. This lectin focus shapes which plant milks he accepts and which he rejects.

Coconut milk is his top plant-based pick. Coconuts are not legumes or grains, so they don’t carry the lectin load he worries about. Coconut milk is also naturally free of casein and lactose, making it a safe choice in his framework for people who want to avoid dairy altogether. He also generally accepts hemp milk and flax milk for similar reasons.

Almond milk gets a conditional pass. Gundry has said almonds are acceptable if their skins are removed (since lectin concentrations tend to be higher in seed coats), but most commercial almond milks are made from whole almonds. He suggests looking for brands that use blanched almonds or making your own.

The milks he actively warns against are soy milk and oat milk. Soy is a legume, which places it squarely in his high-lectin category. Oat milk and other grain-based milks also raise concerns in his framework because grains contain lectins, and oat milk in particular tends to be higher in sugar and lower in protein than dairy. From a nutritional standpoint, plant-based milks generally deliver less protein and lower bioavailability than dairy, with digestibility scores for plant protein sources running well below those of dairy proteins.

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Fermented Dairy Gets Special Treatment

Gundry is notably more enthusiastic about fermented dairy than about fresh milk, even within his approved A2 category. He regularly recommends kefir, aged cheeses, and full-fat yogurt from goat or sheep milk.

His reasoning is that fermentation partially breaks down casein and lactose, reducing the load of potentially problematic proteins while adding beneficial bacteria. Kefir in particular contains a diverse mix of bacteria and yeasts that has been associated in research with gut microbiota modulation, antimicrobial activity, and anti-inflammatory effects.

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Kefir can be made from goat, sheep, buffalo, camel, or cow’s milk, so Gundry recommends choosing versions made from A2-producing animals. Goat milk kefir is probably the easiest to find in health-food stores in the U.S. Aged cheeses from sheep or goat milk, such as Manchego or Pecorino, are another go-to in his recommendations because the aging process further breaks down problematic proteins while concentrating fat-soluble vitamins.

His Stance on Milk Processing

Beyond casein type, Gundry has expressed skepticism about how conventional milk is processed, specifically homogenization. His concern is that homogenization changes the physical structure of milk fat in ways that alter how the body digests it.

There is legitimate science here, even if the health conclusions remain debated. Homogenization breaks milk fat globules into much smaller droplets and strips away much of their outer membrane. Milk serum proteins then coat these smaller droplets, which changes the way the fat interacts with digestive enzymes.

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Research using animal models has shown that homogenization, more than heat treatment alone, speeds up the rate at which amino acids empty from the stomach into the small intestine. In one study using pigs as a model for adult human digestion, the release of essential amino acids was more than twice as fast from homogenized milk compared to non-homogenized milk.

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Whether faster amino acid release is actually harmful is still unclear. Some researchers speculate it could contribute to metabolic spikes or reduce the body’s ability to absorb nutrients gradually, but human clinical trials showing real health consequences from homogenized versus non-homogenized milk are scarce. Lab studies do confirm that processing changes milk’s structure and digestion dynamics, which is enough for Gundry to recommend seeking out non-homogenized (sometimes labeled “cream-top”) options when possible.

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How Strong Is the Evidence for A2 Milk?

Gundry presents the A1/A2 distinction with a confidence that outruns the current state of the research. The evidence is real but limited, and it tells a more complicated story than “A1 bad, A2 good.”

The most frequently cited study, a 2016 randomized crossover trial in people who self-reported milk intolerance, found that drinking A1-containing milk was associated with worse digestive symptoms, slower gut transit, higher inflammation markers, and even slower cognitive processing compared to A2-only milk.

An earlier pilot study found that A1 milk led to significantly higher stool consistency scores (meaning looser, more irregular stools) and a strong positive correlation between abdominal pain and stool changes that was absent with A2 milk. Some participants also showed elevated fecal calprotectin, a marker of intestinal inflammation, on the A1 diet.

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However, a more recent randomized, double-blind, crossover trial produced a more mixed picture. While A2 milk reduced abdominal pain, fecal urgency, and gut rumbling compared to A1/A2 milk, it actually increased bloating and loose stools on one symptom scale. Fecal calprotectin did decrease with A2 milk, and the effect was more pronounced in men than women, suggesting individual variation plays a significant role.

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The takeaway from the clinical literature so far is that A2 milk does appear to be gentler on the gut for some people, particularly those who already experience digestive trouble with conventional milk. But it is not a clean sweep. Some symptoms improve, others don’t, and a few may actually be slightly worse depending on the individual. The studies are also small, and the field is still sorting out how much of “milk intolerance” is truly about casein type versus lactose, fat content, or other variables.

Gut Bacteria and A2 Milk

One area of emerging research that aligns with Gundry’s broader gut-health philosophy involves how A1 and A2 milk affect the gut microbiome differently. Animal and early human studies suggest that A2 milk may encourage the growth of beneficial bacteria. Research has shown A2 milk consumption is associated with increased levels of Lactobacillus species in animal models and increased Bifidobacterium longum and Blautia species in human participants. By contrast, A1 milk was associated with increases in potentially pathogenic Streptococcus species.

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These findings are preliminary, mostly from animal models or small human interventions, so treating them as settled would be premature. But they do suggest a plausible mechanism beyond simple protein digestion: A1 and A2 casein may shape the bacterial community in the gut in meaningfully different ways, which could have downstream effects on inflammation, immune function, and nutrient absorption.

Practical Challenges of Following These Recommendations

Finding Gundry-approved milk is straightforward in some areas and genuinely difficult in others. A2-certified cow’s milk has become widely available in major supermarkets across the U.S., Australia, and parts of Europe. Goat milk is easy to find in most health-food stores and increasingly in conventional grocery chains. Sheep milk and water buffalo milk, on the other hand, are specialty products that may require ordering online or visiting a farmers’ market.

Cost is a real factor. A2 cow’s milk typically runs 50 to 100 percent more expensive than conventional milk. Goat milk is similarly priced above standard dairy. Sheep and buffalo milk, when you can find them, cost considerably more. For families on a budget, following Gundry’s milk recommendations to the letter can add up quickly.

There is also the issue of verification. Establishing whether a given bottle of milk truly contains only A2 beta-casein is not something a consumer can do at home. The industry relies on genetic testing of individual cows, and quality control across A2-certified herds has been the subject of ongoing debate. Researchers have highlighted challenges in establishing clear regulatory standards and quality-control methods for A1-free milk, meaning consumers are largely trusting the brand’s testing protocol.

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Goat and sheep milk avoid this verification problem entirely since those species simply don’t produce A1 casein. If you want certainty rather than trust in a label, animal species is a more reliable guide than breed certification.

Where Gundry’s Advice Fits in Mainstream Nutrition

Gundry occupies an unusual space in the nutrition world. He is a credentialed physician with real surgical and research experience, but his dietary claims, particularly around lectins, go well beyond mainstream scientific consensus. Most nutritionists and gastroenterologists do not categorically advise against A1 milk, and major dietary guidelines from organizations like the USDA and WHO do not distinguish between A1 and A2 dairy.

That said, his A2 milk recommendation is probably the least controversial part of his broader program. The mechanism behind BCM-7 release from A1 casein is documented, and the clinical trials, while small, consistently show at least some digestive benefit from switching to A2. For someone who currently avoids dairy entirely because of gut symptoms, trying A2 or goat milk before giving up on dairy altogether is a reasonable experiment that most gastroenterologists would not object to.

His anti-lectin framework is harder to evaluate because the clinical evidence for lectin avoidance as a broad dietary strategy remains thin. Avoiding soy milk and oat milk because of lectins is a Gundry-specific position, not a mainstream one. Soy milk and oat milk are widely considered safe and nutritious by major health organizations. Whether you find Gundry’s lectin arguments persuasive enough to skip those products is ultimately a personal judgment call rather than a matter of settled science.

When A2 Milk Might Not Help

If your problem with milk is genuine lactose intolerance, switching to A2 milk will not solve it. A2 milk contains the same amount of lactose as conventional milk. The A1/A2 distinction is about protein, not sugar. This is a common source of confusion, partly because A1 casein digestion can produce symptoms that overlap with lactose intolerance, including bloating, cramping, and loose stools. Some people who believe they are lactose intolerant may actually be reacting to A1 casein, and for them, A2 milk could help. But for people with confirmed lactase deficiency, the casein type is irrelevant to their primary symptom trigger.

People with a true cow’s milk protein allergy, which involves an immune reaction to casein or whey proteins regardless of variant, should also not expect A2 milk to be safe. The allergenic proteins in A2 milk are structurally very similar to those in A1 milk. Goat and sheep milk proteins are somewhat different but can still cross-react with cow’s milk allergy in a significant percentage of cases. If you have a diagnosed milk allergy, the casein type is beside the point.

Finally, Gundry’s recommendations are built around a specific theory of gut health and inflammation that not everyone shares and that remains a work in progress scientifically. People who drink conventional milk without any digestive complaints, skin issues, or inflammatory symptoms have no established reason to switch based on current evidence. The research on A1 casein’s harms is most relevant to people who are already symptomatic. For everyone else, the benefits of switching are speculative at best.