Humans can safely drink milk from a surprisingly wide range of animals, though only a handful are commercially common. Cow, goat, sheep, water buffalo, camel, donkey, horse, yak, and reindeer milk are all consumed by people in various parts of the world. Each has a distinct nutritional profile, and some offer real advantages for people who struggle with standard dairy.
Cow Milk: The Global Default
Cow milk dominates global dairy production for practical reasons: cows produce large volumes, are easy to milk with machines, and breed well in captivity. A typical serving contains about 3.4% protein, 4.1% fat, and 4.8% lactose. It’s a strong source of calcium, phosphorus, and B vitamins. For most people with no dairy allergy or lactose intolerance, cow milk is nutritionally complete and inexpensive.
One detail worth knowing is the protein structure. Most conventional cow milk contains a mix of A1 and A2 beta-casein proteins. During digestion, A1 beta-casein releases a peptide called BCM-7, which some people find irritating to the gut. This is why “A2 milk” has become a growing niche product. Goat, sheep, and buffalo milk naturally contain the A2 type, so people who feel better on A2 cow milk often tolerate these alternatives well too.
Goat Milk: Easier to Digest for Many
Goat milk is the most widely consumed alternative to cow milk worldwide. It contains slightly less protein (about 2.9% versus 3.3%) and about 9% less lactose, with a similar fat content around 3.6%. Where it stands out is its mineral profile: goat milk delivers roughly double the copper, 85% more iodine, 33% more potassium, and 27% more magnesium than cow milk. Calcium levels are nearly identical, only about 5% lower.
The beta-casein in goat milk across multiple breeds is the A2 type, meaning it does not produce BCM-7 (or produces very little) during digestion. This difference from conventional cow milk is significant for people who experience bloating or discomfort from standard dairy. Goat milk also has smaller fat globules, which may contribute to its reputation for being gentler on the stomach. The taste is tangier than cow milk, and the strength of that flavor varies by breed and diet.
Sheep Milk: The Richest Common Option
Sheep milk is the most nutrient-dense milk you’re likely to find at a specialty store. It contains roughly 7% fat and 5.7% protein, nearly double the fat of cow milk and significantly more protein. Calcium is exceptionally high at about 182 mg per 100 grams, compared to around 113 mg in cow milk. That richness makes it ideal for cheese (Roquefort, Pecorino, and feta are all traditionally sheep milk cheeses) but also means it’s calorie-dense. Lactose content sits around 4.75%, similar to cow milk, so it won’t help much if lactose is your issue.
Water Buffalo Milk: Thick and Calorie-Dense
Water buffalo milk is the second most consumed milk globally, especially across South Asia, Egypt, and Italy. It contains about 7.6% fat, 4.5% protein, and 107 calories per 100 grams, making it substantially richer than cow milk. The high fat and protein content is why authentic mozzarella di bufala has that distinctly creamy texture that cow milk mozzarella can’t replicate. Buffalo milk is also naturally A2 beta-casein dominant. Its lactose content (about 4.8%) is nearly identical to cow milk, so it’s not a lactose-friendly swap.
Camel Milk: Lower in Fat, Higher in Vitamin C
Camel milk has been a dietary staple across the Middle East, North Africa, and Central Asia for thousands of years and is now available in specialty markets in Western countries. It contains roughly 3.8% fat, 3.3% protein, and 4.3% lactose, making it nutritionally comparable to cow milk but with a few notable differences. Vitamin C levels are three to nearly four times higher than cow milk, ranging from 3.0 to 7.5 mg per 100 grams versus 0.8 to 2.0 mg in cow milk. Iron and zinc concentrations are also higher.
Camel milk has attracted research attention for its insulin-like proteins and potential blood sugar benefits. It also contains smaller immunoglobulins (antibody molecules) that differ structurally from those in cow milk, which is one reason it tends to be tolerated by people with cow milk allergies. The taste is slightly salty and thinner than cow milk. The main barrier is cost: camel milk typically runs five to ten times the price of cow milk in Western markets because camels produce far less milk and are difficult to machine-milk.
Donkey and Horse Milk: Closest to Human Milk
Donkey and horse (mare) milk are the animal milks most similar in composition to human breast milk. Both are very low in fat (mare milk around 1.0 to 1.3%, donkey milk often below 1%) and high in lactose (6.0 to 6.8%), closely matching human milk’s sugar-to-fat ratio. Donkey milk contains lysozyme, a natural antimicrobial enzyme, at levels comparable to human milk and roughly ten times higher than cow milk. This enzyme provides protection against common gut bacteria like E. coli and Staph.
These milks are used in parts of Europe as alternatives for infants with severe cow milk allergy, though availability is extremely limited. Donkey milk in particular has a mild, pleasant taste and is used in cosmetics as well. The low fat content means neither milk feels as rich or satisfying as cow or goat milk for everyday drinking.
Yak, Reindeer, and Moose Milk
These high-latitude milks are consumed regionally but are virtually impossible to find commercially outside their native areas. All three are exceptionally rich compared to cow milk. Reindeer and moose milks have the highest fat and protein concentrations of any commonly milked species, with correspondingly low lactose. Moose milk is also unusually mineral-dense, with calcium levels around 358 mg per 100 grams (more than three times that of cow milk), along with high sodium and phosphorus.
Yak milk is more accessible in Central Asian and Himalayan regions, where it’s traditionally made into butter, cheese, and fermented drinks. These animals are adapted to harsh climates and produce small quantities of extremely concentrated milk, which is why their dairy products tend to be preserved rather than consumed fresh.
Why Some Animals Are Never Milked
Not every mammal’s milk is practical for human consumption, even if it’s technically safe. Pig milk is nutritionally interesting, containing the highest proportion of long-chain polyunsaturated fatty acids among commonly studied species. But pigs have very short lactation periods, produce small amounts per session, have many small teats that are difficult to milk, and are generally uncooperative. The economics simply don’t work.
Similar barriers exist for animals like cats, dogs, and most wild mammals. The species humans have historically milked share a few traits: they’re domesticated, produce reasonable volumes, tolerate repeated milking, and have teats suited to hand or machine milking. That practical filter, more than any nutritional concern, is what limits the list.
Choosing Based on Your Needs
If you’re looking for the most nutritious milk per glass, sheep and water buffalo milk deliver the most protein, fat, and calcium. If digestive comfort is the priority, goat milk’s A2 protein structure and slightly lower lactose make it the most accessible alternative. Camel milk is worth exploring if you have a cow milk allergy, since its different protein structure means many people with bovine dairy allergies tolerate it well. For the closest match to human breast milk in infant feeding contexts, donkey milk’s composition and lysozyme content make it unique among animal milks.
Lactose content varies less than most people expect. Cow, goat, sheep, buffalo, and camel milks all fall between 4.3% and 4.8% lactose. Donkey and horse milk actually contain more lactose than cow milk, not less. If lactose is the problem, switching species won’t solve it unless you move to the very low-lactose options like reindeer or moose milk, which aren’t realistically available. Lactase supplements or fermented dairy products like yogurt and aged cheese remain the practical solutions for lactose intolerance regardless of which animal produced the milk.