In the United States, look for the word pasteurized on the milk package. If it is missing or unclear, ask the retailer or manufacturer; don’t infer pasteurization from the carton’s appearance, where it is sold, or another label claim.
What “pasteurized” means
Pasteurization is a heat treatment intended to kill harmful bacteria. The U.S. Food and Drug Administration (FDA) describes it as heating milk to a specific temperature for a set period of time. It reduces the risk of illness from pathogens, but it does not make milk sterile or shelf-stable. FDA: Raw Milk Questions & Answers
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How to read the package
- “Pasteurized” is the direct label clue that the milk received a pasteurization treatment. FDA advises shoppers to read the label; if the word is absent, the product may contain raw milk. When in doubt, ask the seller or manufacturer rather than guessing. FDA: Milk and Dairy Products
- “Ultra-pasteurized” identifies a more intensive heat process. The FDA’s 2023 Grade A Pasteurized Milk Ordinance defines it as heating at or above 138°C (280°F) for at least two seconds. The ordinance describes extended shelf life under refrigeration—not permission to leave an opened carton unrefrigerated. FDA: 2023 Grade A Pasteurized Milk Ordinance
- “Homogenized” describes how fat is distributed: reducing fat-globule size helps prevent the cream from separating by gravity. It does not establish whether the milk was pasteurized. FDA: Food Labeling Guide
- “Organic” is a production claim governed by USDA’s National Organic Program. It does not, by itself, tell you whether a particular carton was pasteurized; look for pasteurization information separately. USDA: National Organic Program
Why the distinction matters
Raw milk is unpasteurized and can carry disease-causing bacteria, including Salmonella, E. coli, and Listeria. FDA advises choosing dairy products made with pasteurized milk, with particular emphasis in its pregnancy guidance. Some cheeses are not necessarily made with pasteurized milk, so check the product label rather than assuming. FDA: Raw Milk May Pose a Serious Health Risk FDA: Food Safety for Pregnant Women and Their Unborn Babies
Storage still matters
Pasteurization does not prevent milk from eventually spoiling, so keep it refrigerated and follow the package’s storage and use-by instructions. FDA’s pregnancy guidance advises keeping milk and milk products at 40°F (4°C). Ultra-pasteurized milk’s extended shelf life applies under refrigerated conditions; use the package directions for storage after opening. FDA: Food Safety for Pregnant Women and Their Unborn Babies
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A quick carton-checking routine
- Find the product name and ingredient or product information on the package; look specifically for the word pasteurized.
- If it says ultra-pasteurized, understand that as a pasteurization method with extended refrigerated shelf life, not as a shelf-stable product.
- Check storage instructions, including what to do after opening, and keep the milk refrigerated as directed.
- If the label does not clearly state pasteurization status, ask the retailer or manufacturer. For imported products or products governed outside the United States, check the relevant local regulator’s labeling guidance.
These terms describe different things: pasteurized and ultra-pasteurized refer to heat treatment; homogenized refers to fat distribution; organic refers to production standards. Only explicit pasteurization information answers whether the milk was pasteurized.
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