What Are Digestive Enzymes and Do You Actually Need Them?

You've just finished a bowl of chilli, or a curry loaded with lentils, or a big bean salad you were quite proud of, and twenty minutes later your stomach has other ideas. Tight, gurgling, uncomfortably full, maybe reaching for the waistband of your jeans. Or perhaps it's milk in your tea that does it, a dull ache and some unmistakable wind that turns up every single time. 

You've probably heard that digestive enzymes might be the fix, sold as drops, capsules or chewable tablets promising to sort your gut out before it even starts. Digestive enzymes are proteins your body produces specifically to break food down into nutrients small enough to absorb out of your gut and into your blood stream, where they can be used for all the vital processes your body carries out daily. 

In reality, most people already make all the digestive enzymes they need. Your body is remarkably efficient at breaking down food, so for most bloating, wind and digestive discomfort, the answer isn't simply taking an enzyme supplement. In fact, a true deficiency of digestive enzymes is relatively uncommon and is usually caused by an underlying medical condition that needs proper diagnosis and treatment.

That said, there are a few important exceptions. Some people naturally produce too little of specific enzymes, such as lactase, making foods like dairy difficult to digest. Others find that enzymes such as alpha-galactosidase can help reduce gas after eating beans, lentils and certain vegetables.

This guide explains how digestive enzymes work, when they are unlikely to help, and the situations where using the right enzyme supplement can be a sensible, evidence-based approach.

At a Glance: Digestive Enzymes

• Digestive enzymes are proteins made mainly by your pancreas, stomach and small intestine that break carbohydrates, protein and fat down into absorbable pieces.

• Most healthy adults produce more than enough of these enzymes naturally, so a supplement won't add much on top of what your body is already doing.

• Genuine enzyme deficiency does happen, for example in exocrine pancreatic insufficiency (EPI), lactose intolerance, and difficulty with the sugars found in beans and pulses, and in these specific cases, supplementing with enzymes has good evidence behind it.

• If your main issue is general bloating without a clear trigger food, the more likely culprit is your gut microbiome rather than a shortage of enzymes, which is a different problem with a different solution.

What Are Digestive Enzymes and What Do They Do?

Every time you eat, your body sets off a small production line of enzymes designed to strip food down into its component parts. 

The human body makes around 20 essential digestive enzymes, and these are often grouped together based on the types of foods they digest - proteins, carbohydrates and fats. 

Amylase, made in your saliva and pancreas, gets to work on carbohydrates, breaking starches down into simple sugars. Protease, produced mainly in your stomach and pancreas, cuts protein into amino acids. Lipase, made by your pancreas, breaks fat down into fatty acids and glycerol so it can be absorbed. 

Then there are a couple of more specialised ones: lactase, made in your small intestine, which breaks down lactose, the sugar found in milk, and alpha-galactosidase, an enzyme your body doesn't actually produce at all, which is needed to break down the raffinose family of sugars found in beans, lentils and cruciferous vegetables like broccoli and cabbage. 

This whole process runs on autopilot. Chewing and saliva start things off, your stomach adds acid and protease, and your pancreas releases the bulk of your digestive enzymes into your small intestine, where the majority of nutrient breakdown actually happens. 

Enzyme Deficiency: When the Body Doesn't Make Enough

Exocrine pancreatic insufficiency 

Genuine pancreatic enzyme deficiency, known medically as exocrine pancreatic insufficiency or EPI, is a real and clinically significant condition, but it's not common in the general population without an underlying cause. This isn't something you self-manage with an over-the-counter product. It requires a diagnosis, usually from a specialist, and ongoing monitoring of your nutritional status.

EPI happens when your pancreas stops producing enough enzymes to properly digest food, and it's most often linked to chronic pancreatitis, cystic fibrosis, pancreatic surgery or pancreatic cancer, though it can also show up alongside long-standing diabetes, coeliac disease or inflammatory bowel disease. Left unmanaged, EPI can cause weight loss, fatty, floating stools, and deficiencies in fat-soluble vitamins, because without enough lipase, your body simply can't absorb fat properly.

If you have diagnosed EPI, the standard treatment is pancreatic enzyme replacement therapy, or PERT, which is a prescription-only medication containing lipase, amylase and protease, taken with every meal and snack. 

Lactose intolerance 

In lactose intolerance, your small intestine simply isn't producing enough lactase to break down the lactose in milk products. The result is foul smelling diarrhoea. 

In the UK, roughly one in ten adults and older children experience some degree of lactose intolerance, though this varies substantially by ethnic background, since lactase production naturally declines with age in a large proportion of the global population.

The usual remedy is to avoid dairy products altogether, or to buy versions that have already been treated with lactase, so the lactose sugar in them is already digested before you eat them. 

Do Digestive Enzyme Supplements Work?

The answer depends on which enzymes, and the nature of the problem. 

Where the evidence for digestive enzyme supplements is strong

For diagnosed EPI, PERT genuinely works. Studies show it improves fat, protein and carbohydrate absorption, reduces symptoms like fatty stools, wind and abdominal pain, and improves nutritional status and quality of life. 

For lactose intolerance, lactase supplements taken before dairy have reasonable supporting evidence, though results vary from one person to another. Some people get complete symptom relief and others notice a smaller improvement. 

For gas triggered specifically by beans, lentils and similar foods, alpha-galactosidase has been tested in several randomised, placebo-controlled trials, including one in children that found it significantly reduced the number of days with moderate to severe bloating and cut the proportion of children experiencing flatulence, with no adverse events reported.

Where the evidence for digestive enzyme supplements is weak

For general bloating and indigestion in people without any diagnosed deficiency or trigger food, the picture is much less convincing. Reviews from major medical institutions have repeatedly noted there's little solid evidence that over-the-counter multi-enzyme blends help with everyday bloating in otherwise healthy people. 

It's also worth knowing that these products, unlike prescription PERT, aren't held to the same rigorous manufacturing and testing standards. That doesn't mean every product on the shelf is useless, some small trials of multi-enzyme blends in healthy adults have shown modest reductions in bloating after meals, but the overall evidence base is thinner and less consistent than it is for the specific conditions above.

Do You Actually Need Digestive Enzymes?

You might genuinely benefit from a targeted enzyme supplement if:

• You've been diagnosed with EPI, chronic pancreatitis or cystic fibrosis by a doctor, in which case prescription PERT is the appropriate route, not an OTC product

• You know dairy consistently triggers bloating, gas or discomfort within a couple of hours, suggesting lactose intolerance

• Beans, lentils, chickpeas or cruciferous vegetables reliably leave you gassy and uncomfortable, which points towards a raffinose-sugar issue that alpha-galactosidase is specifically designed for

You probably don't need an enzyme supplement if:

• Your bloating is inconsistent, unrelated to any specific food, or shows up regardless of what you eat

• You haven't noticed a clear pattern linking symptoms to dairy or legumes specifically

• You're otherwise healthy with no diagnosed pancreatic or digestive condition

If you fall into that second group, the more useful question isn't which enzyme to take, it's whether the issue actually lies somewhere else entirely.

Digestive Enzymes vs Probiotics: Which Do You Need?

Probiotics play a natural role in food digestion. Digestive enzymes break food down mechanically and chemically, before it's fully absorbed. Probiotics work further down the line, supporting the trillions of bacteria living in your large intestine that ferment whatever your body didn't fully digest higher up.

For a lot of people dealing with everyday bloating that isn't linked to a specific trigger food, the root cause is more likely to be an imbalance in that bacterial population than an enzyme shortfall. 

If that sounds like you, browsing our digestive health supplements range or looking specifically for a gastro-resistant probiotic with live cultures may be a more appropriate starting point than an enzyme blend. We've covered the bloating and microbiome connection in more depth in our dedicated article on gut bacteria and bloating, so if that sounds closer to your situation, that's the better next stop.

Natural Sources of Digestive Enzymes

You can get a modest boost from food itself. 

• Pineapple contains bromelain, a protein-digesting enzyme

• Papaya contains papain, which works similarly

• Fermented foods like sauerkraut, kimchi and natural live yoghurt contain enzymes produced during fermentation. 

The evidence that eating these foods measurably improves digestion is limited and mostly based on the known chemical mechanism rather than large human trials, but they're a genuinely reasonable part of a varied, balanced diet regardless, and there's no real downside to including them.

How to Choose a Digestive Enzyme Supplement

If you've identified a specific trigger, a bit of care goes a long way in choosing the right product. Match the enzyme to your actual issue rather than reaching for a broad "everything" blend, lactase for dairy, alpha-galactosidase for beans and cruciferous vegetables. 

Look for products that name the specific enzymes included along with their activity units, rather than vague proprietary blends that don't tell you how much of anything you're actually getting. 

Third-party testing matters too, since over-the-counter enzyme products aren't as tightly regulated as prescription medications, so independent verification of what's actually in the tub is a meaningful quality signal.

If you suspect something more serious, persistent weight loss, pale or floating stools, or ongoing abdominal pain, please see your GP rather than trying to self-treat with an OTC product. Suspected EPI needs proper testing and, where confirmed, prescription-strength PERT, not a supplement bought online.

Conclusion

Digestive enzymes are essential, there's no digesting food without them, but the honest picture is that most healthy people already make plenty. Where supplementing genuinely helps is in specific, identifiable situations: diagnosed EPI treated with prescription PERT, lactose intolerance managed with lactase, and bean-related gas eased with alpha-galactosidase. If your bloating doesn't fit neatly into one of those categories, it's worth considering whether your gut microbiome, rather than a shortage of digestive enzymes, is the more likely explanation, in which case our digestive health range, including a probiotic with live cultures, may be the more appropriate place to start.

This article is provided as general guidance and is not personalised medical advice. If you have persistent digestive symptoms, unexplained weight loss, or suspect a pancreatic condition, please speak to your GP.

Sources and Further Reading

A randomised, double-blind, placebo-controlled trial in children found alpha-galactosidase significantly reduced the number of days with moderate to severe bloating and lowered the proportion of children experiencing flatulence, with no adverse events reported. Di Nardo, G., Oliva, S., Ferrari, F., et al., "Efficacy and tolerability of α-galactosidase in treating gas-related symptoms in children: a randomized, double-blind, placebo controlled trial," BMC Gastroenterology, 2013
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3849317/

Pancreatic enzyme replacement therapy improves fat, protein and carbohydrate absorption in people with pancreatic exocrine insufficiency, reducing fatty stools, wind and abdominal pain while improving nutritional status and quality of life. Guts UK, "Pancreatic Exocrine Insufficiency (PEI)," patient information reviewed against NICE guidance https://gutscharity.org.uk/advice-and-information/conditions/pancreatic-exocrine-insufficiency-pei/

Around one in ten UK adults and older children experience some degree of lactose intolerance, with prevalence varying considerably by ethnic background. NHS Inform, "Lactose intolerance" https://www.nhsinform.scot/illnesses-and-conditions/nutritional/lactose-intolerance/

A review of over-the-counter digestive enzyme supplements found little solid evidence that they help with general bloating, gas or bowel irregularity in people without a diagnosed enzyme deficiency, noting these products are far less tightly regulated than prescription enzyme medications. Harvard Health Publishing, "Can taking enzyme supplements help soothe my bloating?" https://www.health.harvard.edu/healthy-aging-and-longevity/can-taking-enzyme-supplements-help-soothe-my-bloating

A double-blind crossover study found that alpha-galactosidase supplementation significantly reduced flatulence in healthy adults after eating a meal containing beans. Ganiats, T.G., Norcross, W.A., Halverson, A.L., et al., "Does Beano prevent gas? A double-blind crossover study of oral alpha-galactosidase to treat dietary oligosaccharide intolerance," The Journal of Family Practice, 1994 https://www.semanticscholar.org/paper/Does-Beano-prevent-gas-A-double-blind-crossover-of-Ganiats-Norcross/5e07d29093d70bbd0480aeb8f6aaf1b408f9e6f8