Are there any natural preservatives in milk?

There are some natural ways to keep milk fresh without using artificial additives. First, keeping milk cold in the fridge (below 40°F or 4°C) is a simple and effective method to slow down spoilage. Pasteurization, which uses heat to kill harmful bacteria, is also considered natural because it doesn't involve adding chemicals.

Another method is Ultra-High Temperature (UHT) pasteurization, where milk is briefly heated to a very high temperature, allowing it to be stored without refrigeration until you open it. Yogurt and kefir, which are fermented milk products, use good bacteria to make them sour. These bacteria lower the milk's acidity, which helps prevent spoilage.

Turning milk into powder by removing most of its moisture is another way to keep it for a long time. When making cheese and yogurt, specific bacteria are added to the milk, which not only help preserve it but also give it a unique taste.