Raw milk is milk from cows, goats, sheep, or other animals that has not been pasteurized.

Many people believe that foods with no or minimal processing are better for their health. Many people also believe that small, local farms are better sources of healthy food. However, some types of processing are needed to protect health. For example, consumers process raw meat, poultry, and fish for safety by cooking. Similarly, when milk is pasteurized, it is heated just long enough to kill disease-causing germs. Most nutrients remain after milk is pasteurized. There are many local, small farms that offer pasteurized organic milk and cheese products.

No. There are no health benefits from drinking raw milk that cannot be obtained from drinking pasteurized milk that is free of disease-causing bacteria. The process of pasteurization of milk has never been found to be the cause of chronic diseases, allergies, or developmental or behavioral problems.

The presence of germs in raw milk is unpredictable. The number of disease-causing germs in the raw milk may be too low to make a person sick for a long time, and later high enough to make the same person seriously ill. For some people, drinking contaminated raw milk just once could make them really sick. Even if you trust the farmer and your store, raw milk is never a guaranteed safe product. Drinking raw milk means taking a real risk of getting very sick.

Pasteurization is the process of heating milk to a high enough temperature for a long enough time to kill illness-causing bacteria contained in the milk. As most commonly applied, pasteurization heats milk to a high temperature for a short time, which kills the bacteria that cause illness. It was invented in a time when millions of people became sick and died of diseases like tuberculosis, scarlet fever, typhoid fever, and other infections that were transmitted through raw milk. Pasteurization has prevented millions of people from becoming ill.

Raw milk contains bacteria, and some of them can be harmful. So, if you’re thinking about consuming raw milk because you believe that it is a good source of beneficial bacteria, you need to know that it isn’t and you may instead get sick from the harmful bacteria. If you think that certain types of bacteria may be beneficial to your health consider getting them from foods that don’t involve such a high risk. For example, so-called probiotic bacteria are sometimes added to pasteurized fermented foods, such as yogurt and kefir.

Pasteurized milk products have occasionally caused illnesses and outbreaks. Usually, this has happened because of germs introduced in the dairy after the pasteurization process. Pasteurized milk that is correctly handled in the dairy, bottled, sealed, and refrigerated after pasteurization, and that is properly handled by the consumer, is very unlikely to contain illness-causing bacteria.

No. Many studies have shown that pasteurization does not significantly change the nutritional value of milk and dairy products. All of the nutritional benefits of drinking milk are available from pasteurized milk without the risk of disease that comes with drinking raw milk.

While it’s true that the heating process of pasteurization does inactivate some enzymes in milk, the enzymes in raw animal milk are not thought to be important in human health. Some nutrients are somewhat reduced in raw milk, but the United States diet generally has plenty of other sources of these nutrients. For example, vitamin C is reduced by pasteurization, but raw milk is not a major source of vitamin C.

Milk contamination may occur from:

• Cow feces coming into direct contact with the milk
• Infection of the cow's udder (mastitis)
• Cow diseases (e.g., bovine tuberculosis)
• Bacteria that live on the skin of cows
• Environment (e.g., feces, dirt, processing equipment)
• Insects, rodents, and other animal vectors
• Humans, for example, by cross-contamination from soiled clothing and boots

Pasteurization is the only way to kill many of the bacteria in milk that can make people very sick.

No. Disease-causing organisms can only be eliminated in milk through pasteurization or by adding chemicals to the milk. Pasteurization is the best method of eliminating disease-causing organisms in milk.
Many organic and raw milk producers are creating sanitary and humane conditions for raising animals and producing “safe” raw milk and raw milk products (like cheeses and yogurts). Does this help reduce milk contamination?
Adherence to good hygienic practices during milking can reduce, but not eliminate, the risk of milk contamination. The dairy farm environment is a reservoir for illness-causing germs. No matter what precautions farmers take, and even if their raw milk tests come back negative, they cannot guarantee that their milk, or the products made from their milk, are free of harmful germs.

• Germs such as Escherichia coli O157, Campylobacter, and Salmonella can contaminate milk during the process of milking dairy animals, including cows and goats. Animals that carry these germs are usually healthy.

Can I still get a disease from raw milk and raw milk products if the cows or goats are healthy, clean, and grass-fed or if the dairy is especially careful and clean when collecting the milk?
Yes. Even healthy animals may carry germs that can contaminate milk. Milk may be contaminated with bacteria during the milk collection process. Small numbers of bacteria might multiply and grow in the milk before someone drinks it if it is raw. Dairying methods have impr oved over the years but are still no substitute for pasteurization in assuring that milk is safe to drink. Raw milk supplied by “certified,” “organic,” or “local” dairies has no guarantee of being safe.