Pasteurized cream is cream that has been briefly heated to a specific temperature to kill harmful bacteria, then rapidly cooled. Nearly all cream sold in grocery stores in the United States is pasteurized, as federal law requires it for milk products sold across state lines. The process makes cream safe to drink and cook with while preserving its flavor, texture, and fat content.
How Pasteurization Works
Pasteurization is straightforward: heat cream to a temperature high enough to destroy dangerous microorganisms, hold it there for a set time, then cool it quickly. The most common method used commercially is called High Temperature/Short Time (HTST), which heats cream to at least 161°F for 15 seconds. An older method, batch pasteurization, holds cream at 145°F for 30 minutes and is still used by some smaller dairies.
There’s an important detail for cream specifically. Because cream has a higher fat content than milk, federal regulations require the pasteurization temperature to be raised by 5°F when the fat content is 10% or more. That means heavy cream, which typically contains 36% fat, is pasteurized at a slightly higher temperature than whole milk. Fat insulates bacteria from heat, so the bump in temperature ensures every particle reaches a safe threshold.
After heating, the cream is cooled rapidly and packaged. Dairies verify the process worked by testing for an enzyme called alkaline phosphatase, which occurs naturally in raw milk. This enzyme is destroyed at pasteurization temperatures, so if it’s absent, the cream was heated properly.
What It Kills
Raw cream can harbor a range of dangerous bacteria. Pasteurization was originally designed to destroy the organisms responsible for tuberculosis and Q fever, which are the most heat-resistant pathogens found in dairy. In the process, it also eliminates Salmonella, Listeria, E. coli (including the particularly dangerous O157:H7 strain), Campylobacter, and the toxin-producing bacteria behind botulism. These are not theoretical risks. Outbreaks linked to unpasteurized dairy products still occur regularly.
Pasteurized vs. Ultra-Pasteurized Cream
When you’re shopping, you’ll see two main labels on cream cartons: “pasteurized” and “ultra-pasteurized” (sometimes written as UP or UHT). The difference comes down to temperature and shelf life.
Standard pasteurized cream is heated to about 161°F for 15 seconds. It needs to stay refrigerated and lasts roughly 20 to 25 days unopened. Ultra-pasteurized cream is heated to 280°F for just two seconds. That much higher temperature kills virtually all microorganisms, extending the unopened shelf life to 60 to 80 days, though it still requires refrigeration once opened.
Ultra-pasteurized cream dominates store shelves because longer shelf life means less waste for retailers. But the two products don’t perform identically in the kitchen, which matters if you bake or make whipped cream regularly.
How It Affects Flavor and Whipping
Standard pasteurization produces minimal flavor changes. Studies on dairy products pasteurized at typical HTST temperatures found no detectable cooked flavor in the finished product. Ultra-pasteurization, with its much higher heat, can create a subtle cooked or slightly caramelized taste that some people notice, particularly in coffee or simple desserts where cream is a primary ingredient.
The difference is more pronounced when you’re whipping cream. Research comparing raw, pasteurized, and ultra-pasteurized creams found that standard pasteurized cream whips faster and more predictably. Raw cream whipped in about 1.6 minutes on average, while ultra-pasteurized heavy cream without added stabilizers took about 3.4 minutes. Ultra-pasteurized cream also produced less volume, with about 141% overrun compared to higher volumes from less processed creams. Many ultra-pasteurized brands compensate by adding stabilizers or emulsifiers (often listed as “whipping aids” on the label), which help the cream hold its structure.
If you’re making whipped cream for a special occasion and want the best texture and speed, look for cream labeled simply “pasteurized” rather than “ultra-pasteurized.” It can be harder to find, but specialty grocers and local dairies are good sources.
Nutritional Changes
Pasteurization does cause small losses in certain vitamins. A meta-analysis of available research found statistically significant decreases in vitamins B1, B2, C, and folate after pasteurization. Vitamin B12 and vitamin E also declined, while vitamin A levels actually increased slightly. Vitamin B6 showed no significant change.
In practical terms, these losses are modest, and cream isn’t a major source of most of these vitamins anyway. You eat cream for its fat content, flavor, and cooking properties. The calories, fat, and protein in cream are unaffected by pasteurization.
How to Read the Label
Federal law requires that milk products sold in the U.S. be pasteurized or made from pasteurized ingredients. The label will tell you which type of processing was used:
- Pasteurized: Heated to at least 166°F (for cream with 10%+ fat) for 15 seconds. Shorter shelf life, closer to fresh flavor.
- Ultra-pasteurized (UP): Heated to 280°F for 2 seconds. Much longer shelf life, possible subtle cooked flavor.
- Raw: Not heat-treated at all. Illegal to sell across state lines, though some states permit in-state sales.
If the carton doesn’t say “raw,” it’s been pasteurized. Some organic brands use ultra-pasteurization because their products travel longer distances and need the extended shelf life. “Organic” and “pasteurized” are independent labels describing different things.
Storage and Shelf Life
Unopened pasteurized cream keeps for 20 to 25 days when refrigerated at or below 40°F. Ultra-pasteurized cream lasts 60 to 80 days unopened. Once you break the seal, both types should be used within about 7 to 10 days, stored in the coldest part of your refrigerator rather than the door. Always check the use-by date on the package, as the actual shelf life varies depending on the brand’s specific processing and packaging methods. If the cream smells sour, tastes off, or has visible clumps, discard it regardless of the printed date.