Low moisture mozzarella is mozzarella cheese that has had most of its water content removed, bringing it down to less than 50% moisture by weight. Fresh mozzarella, by comparison, contains more than 52% moisture. That difference might sound small on paper, but it dramatically changes the cheese’s texture, shelf life, melting behavior, and how you’d use it in cooking.
How It’s Different From Fresh Mozzarella
Fresh mozzarella is the soft, white cheese you’ll find packed in liquid (water or whey brine) at the deli counter. It’s delicate, milky, and spoils within days of opening. Low moisture mozzarella is the firm, shrink-wrapped block or pre-shredded bag in the regular cheese aisle. It has a denser, slightly springy texture and a more concentrated, saltier flavor because removing water concentrates the milk solids and salt.
The USDA defines the categories precisely. “Mozzarella” must have more than 52% moisture, “low moisture mozzarella” falls between 45% and 52%, and “low moisture part-skim mozzarella” meets that same moisture range while also using milk with reduced fat content. That last category is what most shredded pizza cheese in American grocery stores actually is.
Why the Moisture Level Matters for Cooking
Water content is the single biggest factor in how mozzarella behaves when heated. Fresh mozzarella releases a lot of liquid as it melts, which can make pizza dough soggy or turn a casserole watery. Low moisture mozzarella melts into that familiar golden, stretchy layer without flooding the dish. It also browns more evenly because there’s less water to evaporate before the surface temperature rises enough for browning to occur.
This is exactly why virtually every pizzeria in the United States uses low moisture mozzarella (or its part-skim version) rather than fresh. It gives consistent, even coverage, pulls into long strings, and develops those appetizing toasted spots on top. Fresh mozzarella has its place on pizza, particularly Neapolitan-style pies baked at very high temperatures for short times, but it behaves like a completely different ingredient.
For baked dishes like lasagna, stuffed shells, or chicken parmesan, low moisture mozzarella holds its shape better during long baking times. It melts without disappearing into the sauce. If you’ve ever layered fresh mozzarella into a lasagna and ended up with a soupy result, the moisture content was the culprit.
Shelf Life and Storage
Removing moisture slows bacterial growth, which is why low moisture mozzarella lasts weeks in the refrigerator compared to fresh mozzarella’s roughly five to seven days after opening. An unopened block of low moisture mozzarella typically stays good for several weeks past its production date, and once opened, it holds for two to three weeks if wrapped tightly. Shredded versions contain anti-caking agents (usually cellulose or potato starch) that also absorb surface moisture and extend usability, though they slightly reduce how smoothly the cheese melts.
Low moisture mozzarella also freezes reasonably well. The texture becomes a bit crumblier after thawing, so it’s better suited for cooking than eating cold, but it retains its melting properties. Fresh mozzarella falls apart after freezing because ice crystals rupture its delicate protein structure.
How Low Moisture Mozzarella Is Made
Both types start the same way: milk is cultured, curds form, and those curds are stretched in hot water to create mozzarella’s characteristic pull-apart texture. For fresh mozzarella, the process essentially stops there. The cheese is shaped into balls and packed in liquid.
For low moisture mozzarella, the cheese goes through additional steps to drive off water. Manufacturers may knead the curds longer, press them, or age the cheese briefly in controlled conditions. Some producers brine the cheese for a shorter period and then allow it to dry. The result is a firmer block that can be sliced, shredded, or cubed without falling apart. The aging, even if only days to a couple of weeks, also develops a slightly tangier, more complex flavor compared to the mild milkiness of fresh mozzarella.
Whole Milk vs. Part-Skim
When you’re shopping, you’ll notice that most low moisture mozzarella is also labeled “part-skim.” This means the milk used had some cream removed before cheesemaking. Part-skim versions have a minimum of 30% milkfat in the dry portion of the cheese, while whole milk versions have a minimum of 45%. In practical terms, whole milk low moisture mozzarella is creamier, melts a bit more fluidly, and has a richer taste. Part-skim is slightly firmer, stretches more, and has a cleaner, less buttery flavor.
For pizza specifically, many cooks prefer part-skim because it creates better stretch and browns more reliably. Whole milk versions can release enough fat during baking to leave an oily sheen on top. Both work well, and the choice comes down to the texture and richness you want.
Choosing the Right Mozzarella
Use low moisture mozzarella when you want reliable melting, browning, and stretch: pizza, grilled cheese, baked pasta, quesadillas, or anything where the cheese needs to perform under heat for more than a minute or two. It’s also the better choice for cold sandwiches and cheese boards where you want neat slices rather than soft, wet pieces.
Fresh mozzarella is better for dishes where its creamy texture and mild flavor are the star: caprese salads, bruschetta, or as a finishing topping added after cooking. Some recipes benefit from both. A classic New York slice uses low moisture mozzarella under the sauce or as the base layer, while some Neapolitan-inspired versions drop torn pieces of fresh mozzarella on top for pockets of creaminess.
If a recipe just says “mozzarella” without specifying, it almost always means low moisture. That’s the default in American cooking. If the recipe intends fresh mozzarella, it will typically say so explicitly or mention the cheese packed in water.