Romano cheese is not technically lactose free, but it contains so little lactose that most people with lactose intolerance can eat it without symptoms. As a hard, aged cheese, Romano loses nearly all of its lactose during production and ripening, leaving only trace amounts in the finished product.
Why Romano Has Almost No Lactose
Lactose disappears from cheese through two main processes, and Romano benefits heavily from both. The first is bacterial fermentation. During cheesemaking, starter bacteria break lactose down into its simpler sugars, glucose and galactose, and use them as fuel. Romano production uses both heat-loving and cool-temperature bacteria, so fermentation is aggressive from the start. The second process is whey drainage. Lactose dissolves in whey (the liquid portion of milk), and Romano’s production involves extensive draining, pressing, and turning of the curd, physically removing most of the lactose-containing liquid before aging even begins.
Then comes the long wait. Pecorino Romano, the most common variety, matures for 5 to 18 months. During that time, any remaining lactose continues to be consumed by bacteria. By the time the cheese reaches your plate, only trace residual lactose remains. The general rule with cheese is simple: the harder and more aged it is, the less lactose it contains. Romano sits near the top of that spectrum alongside Parmesan and aged Asiago.
Different Types of Romano Cheese
The name “Romano” covers a few distinct cheeses, and the type you buy matters slightly for lactose content. Pecorino Romano is made from sheep’s milk, which starts with less lactose than cow’s milk. In a standard 650 mL serving, sheep’s milk contains about 24.9 grams of lactose compared to 33.3 grams in cow’s milk. That lower starting point, combined with months of aging, means Pecorino Romano ends up with very little residual lactose.
Romano Vaccino is made from cow’s milk, and while it begins with slightly more lactose, the same fermentation and aging processes bring the final amount down to trace levels. Caprino Romano, made from goat’s milk, follows a similar pattern. Goat’s milk contains lactose in roughly the same range as cow’s milk, so the real differentiator across all three varieties is not the milk source but the aging time. A well-aged Romano of any type will have minimal lactose.
In the United States, cheese simply labeled “Romano” at the grocery store is often a cow’s milk version made domestically. These tend to have shorter aging periods than traditional Pecorino Romano, which could mean marginally more residual lactose. If you’re particularly sensitive, look for imported Pecorino Romano or check the label for aging information.
How Much Lactose You Can Likely Tolerate
Most people with lactose intolerance can handle about 12 grams of lactose in a single sitting, roughly the amount in one cup of milk, before experiencing symptoms like bloating, gas, or cramping. Many can tolerate even more when the lactose is spread across a meal. A typical serving of Romano cheese (a tablespoon or two of grated cheese on pasta) contains well under 1 gram of lactose, far below the threshold that triggers discomfort for the vast majority of lactose-intolerant individuals.
This is why organizations that track food intolerances generally consider aged hard cheeses safe for people who are lactose intolerant. You’re not consuming a zero-lactose food, but the amount is so small it’s functionally irrelevant for most people.
When Traces Might Still Matter
There is a small subset of people who react to even very low levels of lactose, particularly those with a severe deficiency in the enzyme that breaks it down. If a single bite of hard cheese has caused you problems in the past, Romano could still be an issue despite its minimal lactose content. In that case, a lactase enzyme supplement taken with the meal can help, or you may want to look for cheeses specifically certified as lactose free, which use added enzymes during production to eliminate lactose entirely.
It’s also worth noting that some processed or pre-shredded Romano products include added ingredients like anti-caking agents or fillers that occasionally contain small amounts of lactose. A block of aged Romano that you grate yourself is your most reliable option if you want to keep lactose as low as possible.