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Lactase is the enzyme in your small intestine that splits lactose, the natural sugar in milk, into two smaller sugars your body can absorb. Many people make less lactase after childhood, and some of them get gas, bloating or diarrhea after dairy, which is called lactose intolerance. Lactase pills and drops supply the same enzyme from outside the body: taken with dairy or added to milk, they break down part of the lactose before it reaches the colon. The National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) says lactase products can help some people manage symptoms, but the trials are small, and many people tolerate a modest amount of lactose anyway. Here is how lactase works, what the research shows and how it compares with lactose-free foods.
Peptide Labs sells one product that lists lactase among its enzymes, but this article does not recommend it or any other product. It is general information, not medical advice.
Key Takeaways
- Lactase breaks lactose into glucose and galactose; low lactase lets lactose reach the colon, where bacteria turn it into gas and fluid.
- Lactase pills and drops work only on the dairy they are taken with; they do not raise the lactase your intestine makes.
- A placebo-controlled trial found less bloating and less breath hydrogen with lactase, but it was small and company-supported.
- Most adults with lactose intolerance can handle the lactose in about a cup of milk, especially with meals.
- Lactose-free milk, yogurt and hard cheeses are alternatives; keep an eye on calcium and vitamin D if you cut dairy.
What is lactase?
Lactase is a digestive enzyme made by cells lining the small intestine. It cuts lactose into glucose and galactose, which are small enough to be absorbed. When lactase levels are low, some lactose passes into the colon undigested. There, according to NIDDK, bacteria break it down and produce fluid and gas, which can cause bloating, diarrhea, gas, nausea, belly pain, rumbling and sometimes vomiting, usually within a few hours. How strong the symptoms are depends largely on how much lactose you have.
NIDDK describes several reasons for low lactase:
- Lactase nonpersistence (primary lactase deficiency) is the most common. The intestine makes less lactase after infancy, and symptoms may not start until later childhood, the teen years or early adulthood.
- Secondary lactose intolerance follows injury to the small intestine from infections, celiac disease, Crohn’s disease, some medicines, surgery or radiation. It may improve once the cause is addressed.
- Congenital lactase deficiency is rare; the intestine makes little or no lactase from birth.
- Premature birth can mean low lactase for a short time; it usually improves as the baby grows.
Lactose malabsorption is not the same as lactose intolerance
Many people digest lactose poorly without noticing any symptoms. NIDDK calls that lactose malabsorption and reserves the term lactose intolerance for people who do get symptoms. Malabsorption is most common in Africa and Asia, and in the United States it is more common among African Americans, American Indians, Asian Americans and Hispanics or Latinos, and least common among people with European family roots. A widely quoted figure, that about two-thirds of the world’s adults malabsorb lactose, came from a 2017 meta-analysis that its journal later retracted, so we do not repeat its numbers here.
Lactose intolerance is also different from a milk allergy. A milk allergy is an immune reaction to milk proteins, most often appears in the first year of life and can be life threatening. Lactase does nothing for a milk allergy.
How lactase pills and drops work
Lactase pills are the most common lactose intolerance pills, and they come as swallowed tablets, chewables and liquid drops. NIDDK explains that tablets are taken before eating or drinking milk products, while drops are added to milk before you drink it. Either way, the lactase enzyme starts breaking lactose down in the food itself or in your gut, so less of it reaches the colon.
Two limits are worth knowing. First, the effect lasts only for the dairy you take it with. Second, NIDDK notes that nothing can increase the amount of lactase your own intestine makes when the cause is nonpersistence or a congenital deficiency, so lactase products manage exposure rather than change the underlying condition. NIDDK also advises checking with a doctor before using lactase products, because some people, such as young children and pregnant or breastfeeding women, may not be able to use them.
Do lactase pills work? What the research shows
| Study | Who took part | What it found | Limits |
|---|---|---|---|
| 2010 systematic review, Annals of Internal Medicine | 36 randomized trials of lactose intolerance or malabsorption | Most adults tolerated the lactose in about a cup of milk; evidence was insufficient for lactose-reduced milk, probiotics and other approaches | Trials too varied to pool; most enrolled people with malabsorption rather than symptoms |
| 2021 crossover trial, JGH Open | 47 adults in India with breath-test-confirmed intolerance | Lactase chewables vs placebo before a lactose drink: fewer symptoms and 55% lower breath hydrogen | Sponsor supplied the tablets and paid for breath tests; one test drink per visit |
| 2020 systematic review, Nutrients | Controlled trials of probiotics and prebiotics | Mixed results that depended on the specific strain | Studies very different; only one prebiotic trial |
The largest review, from a University of Minnesota team, pooled what was known up to 2009. Its clearest finding was not about lactase at all: most people with presumed lactose intolerance could handle the lactose in roughly one cup of milk. For lactose-reduced milk and other approaches, the trials were too small and too different to say much, and the authors called for more studies.
Newer trials are mostly small. In a 2021 double-blind crossover study, 47 adults with confirmed lactose intolerance had fewer symptoms and much less hydrogen on their breath when they took lactase chewables rather than placebo before a lactose drink. The company that makes the tablets provided them and paid for the breath tests, and the authors noted that symptom changes did not line up neatly with the breath results. A fair reading is that lactase can reduce symptoms for a specific dairy meal in some people, while results vary with the amount of lactose, the food it comes in and how much lactase your own gut still makes.
Lactase pills vs lactose-free foods and other options
| Option | How it works | Points to know |
|---|---|---|
| Lactase tablets or chewables | Enzyme taken with dairy breaks down lactose | Covers only that meal; check with a doctor first |
| Lactase drops | Added to milk before drinking | Same enzyme, mixed into the milk ahead of time |
| Lactose-free or lactose-reduced milk | Lactose already broken down | NIDDK says just as healthy as regular milk |
| Yogurt and hard cheeses | Naturally lower in lactose | Cheddar and Swiss are examples NIDDK gives |
| Smaller servings with meals | Less lactose at one time | Many people can find a level that suits them |
| Plant milks | No lactose | Calcium varies; choose fortified versions |
NIDDK suggests trying small amounts of milk with meals, adding dairy back a little at a time, and choosing yogurt or hard cheeses before reaching for any product. Lactose is also the D in FODMAP, so people following a low FODMAP diet for irritable bowel symptoms often use lactose-free milk during the restriction phase.
Keep calcium and vitamin D in view
Milk products are a main source of calcium and vitamin D, and NIDDK warns that cutting them out can leave you short. Foods without lactose that supply calcium include canned salmon or sardines with soft bones, broccoli and leafy greens, oranges, almonds, dried beans, tofu and calcium-fortified cereals, juices and soy milk. A dietitian can help you plan this.
Hidden lactose in foods and medicines
Lactose turns up in baked goods, cereals, instant potatoes, salad dressings, processed meats, protein powders and some nondairy creamers. On ingredient lists, NIDDK says to look for milk, lactose, whey, curds, milk by-products, dry milk solids and nonfat dry milk powder. Some prescription and over-the-counter medicines contain small amounts too: the Drug Facts for Some over-the-counter water pills, for example, list lactose among the inactive ingredients. Most people will not notice such small amounts, but ask your pharmacist if you react to even a little lactose.
When dairy symptoms need a clinician
Gas and bloating after milk are easy to blame on lactose, but NIDDK points out that irritable bowel syndrome, celiac disease, inflammatory bowel disease and small bowel bacterial overgrowth can cause similar symptoms. A doctor may ask you to stop dairy for a while or arrange a hydrogen breath test, in which you drink a liquid with a known amount of lactose and breathe into a collection bag every 30 minutes. See a clinician for symptoms that are new, severe or persistent, or that come with weight loss or blood in the stool, and do not self-diagnose a child. For everyday bloating, our guides to debloating and probiotics for bloating cover other common causes.
Reading lactase on supplement labels
Dedicated lactase products name lactase as the main ingredient. In combination formulas it is often one enzyme among several, which makes the amount hard to judge. The Physician’s Choice Probiotics for Weight Management capsule, for instance, lists lactase inside a proprietary enzyme blend with proteases, amylase, cellulase and lipase, so the label does not show how much lactase it contains. It is a probiotic and botanical formula rather than a lactose product, and its prebiotic blend includes inulin, a fiber that some people with sensitive guts find gassy. The label asks pregnant or lactating women and anyone taking medication to consult a health care professional first.
Frequently Asked Questions
What does lactase do?
Lactase is the enzyme that splits lactose, the sugar in milk, into glucose and galactose so it can be absorbed. Low lactase lets lactose reach the colon, where it can cause gas and bloating.
Do lactase pills work?
They can reduce symptoms for some people when taken with dairy, according to NIDDK and small trials. Results vary, and the evidence base is limited.
When should you take lactase pills?
NIDDK says lactase tablets are taken before eating or drinking milk products, and drops are added to milk before drinking. Follow the product label for specifics.
Are lactase pills safe?
Lactase is generally well tolerated, but NIDDK advises checking with a doctor first because some people, such as young children and pregnant or breastfeeding women, may not be able to use them.
Is lactose-free milk better than taking lactase?
Neither is better for everyone. Lactose-free milk has the lactose broken down in advance, which avoids guesswork; pills are more flexible for meals out.
Can lactase help a milk allergy?
No. A milk allergy is an immune reaction to milk proteins, not a lactose problem, and can be dangerous. Lactase does not change it.
Questions about a label? Contact us or read our Buyer’s Guide. Follow the label and ask a healthcare provider before starting any supplement, especially if you take medicines. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.
Last reviewed October 2026.
Related guides: How to Debloat: Common Causes of Bloating, What Helps and When to See a Doctor, Probiotics for Bloating and Gas: What the Strain-by-Strain Evidence Shows, Low FODMAP Diet: What FODMAPs Are, FODMAP Foods and the 3 Phases.