Do digestive enzymes work? What the evidence actually says

The bottle says «supports digestion» and contains twelve enzymes with names ending in -ase. The intuition is flawless: if digestion is hard work, adding enzymes should help. The problem is that digestion almost never fails for lack of enzymes, and a good part of this market rests on that intuition rather than on clinical trials.

Here is where things stand, in two sentences. Across the entire European Union there is exactly one authorised health claim for a digestive enzyme, the one for lactase, with a minimum dose written into the regulation itself. And the enzymes that genuinely correct poor fat absorption are not sold as supplements at all: they are prescription medicines. Almost everything bought in a health food shop sits between those two extremes. We are going to sort it out with figures, even where sorting it out costs us a sale.

The short version

• Only lactase has an authorised health claim in the EU, and it requires a minimum of 4,500 FCC units per dose, with every lactose-containing meal (Regulation 432/2012).
• Neither bromelain, nor papain, nor «digestive enzymes» as a group have an authorised claim. That is not a legal technicality: it means the effect has not been demonstrated to EFSA.
• Pancreatin does work — it raises the coefficient of fat absorption from 67.4 % to 83.2 % against placebo — but it is a prescription medicine, not a bottle of digestive enzymes.
• No enzyme on the market lets a coeliac eat gluten. The five tested in PLOS ONE (2015) left all nine immunogenic gliadin epitopes intact.
• Most people who digest lactose poorly tolerate up to 12 g in a single dose (EFSA, 2010). Before buying lactase, switching dairy products is often enough.
• Units matter more than milligrams: FCC for lactase, Ph. Eur. units for lipase, GalU for alpha-galactosidase. «500 mg of enzyme complex» tells you absolutely nothing.
• And the awkward one: a systematic review of 36 trials found insufficient evidence that lactase supplements reduce symptoms, even though the European claim is authorised for digestion.

What a digestive enzyme actually does

An enzyme does not «improve digestion». It cuts one specific chemical bond and nothing else. Lactase (a beta-galactosidase) splits lactose into glucose and galactose. Proteases cut proteins into peptides and amino acids. Lipases separate triglycerides into fatty acids and glycerol. Amylases break down starch. Alpha-galactosidase attacks raffinose, stachyose and verbascose, the oligosaccharides of pulses and brassicas.

From that comes the rule that explains everything else: an enzyme does not add digestive capacity, it replaces the one that is missing. If none is missing, there is nothing to replace. And there are only two ways for one to genuinely be missing. The first is a deficiency of one specific brush-border enzyme in the gut; the textbook case is lactase, whose production falls after childhood in most of the adult human population. The second is a global failure of the exocrine pancreas — chronic pancreatitis, cystic fibrosis, pancreatic surgery or tumour — which does not affect one enzyme but all of them at once.

It is also worth separating two things that get confused constantly: digesting lactose poorly is not the same as being intolerant. You can have little lactase and feel nothing at all, because intolerance is the symptoms, not the test result. In Spain the official figures do not even agree with each other: the SEPD and the SEMG — the Spanish societies of digestive pathology and of general practice — spoke in 2015 of between 30 % and 50 % of the population, while the SEPD's own public-facing pages use a range of 20 % to 40 %. We mention it because the spread matters: it is the difference between «almost half the country» and «one person in five».

When an enzyme makes sense and when it does not

1. Lactose: the only scenario with an authorised claim

This is the only case where an effect can be stated without stepping outside Regulation 1924/2006. The official wording in the annex to Regulation 432/2012 reads, word for word: «Lactase enzyme improves lactose digestion in individuals who have difficulty digesting lactose». The condition of use is equally literal: the claim may be used only for food supplements, with a minimum dose of 4,500 FCC (Food Chemicals Codex) units, with instructions to consume it with each lactose-containing meal, and with information that tolerance to lactose is variable. The opinions behind it are EFSA Journal 2009;7(9):1236 and 2011;9(6):2203.

Now the nuance almost nobody mentions: the claim is about lactose digestion, not about symptoms. And when symptoms are what you measure, the systematic review by Shaukat and colleagues (Annals of Internal Medicine, 2010), covering 36 randomised trials — 28 of them on lactose-reduced formulations and lactase supplements — concluded that there is insufficient evidence that those supplements reduce symptoms. Two official sources, two different answers, because they measure different things. The honest thing is to say so plainly.

In the catalogue this translates into few and very specific references: Zeutics lactase tablets and Santiveri's Flor Intollerance Lacto, inside digestive and probiotic enzymes. But before the capsule comes food, and there is an authorised claim there too — the one for live yoghurt cultures: «Live cultures in yoghurt or fermented milk improve lactose digestion of the product in individuals who have difficulty digesting lactose», on condition of at least 10⁸ colony-forming units per gram of Lactobacillus delbrueckii subsp. bulgaricus and Streptococcus thermophilus. That means a yoghurt, a goat kefir or an aged cheese, where lactose is all but absent; they are all in refrigerated. If what you want is the difference between a strain and a count, we covered it in the post on which probiotic to take.

2. Exocrine pancreatic insufficiency: that is a medicine, not a supplement

Here the evidence is solid, and it is not on a health food shelf. The meta-analysis by de la Iglesia-García and colleagues (Gut, 2017) pooled 17 randomised trials with 511 patients with chronic pancreatitis, of which 14 trials and 477 patients entered the quantitative analysis. Enzyme replacement therapy raised the coefficient of fat absorption to 83.2 % against 67.4 % on placebo (weighted mean difference 1.67; 95 % CI 0.81-2.53; p = 0.0001) and to 83.7 % against 63.1 % at baseline (WMD 2.28; 1.50-3.06; p < 0.00001).

What is used for that is pancreatin, and in Spain it is a prescription-only medicine authorised by the AEMPS, the Spanish agency for medicines and medical devices. Its summary of product characteristics states «treatment of exocrine pancreatic insufficiency» and the doses run from 25,000 to 80,000 Ph. Eur. units of lipase per meal, or 500 to 1,000 units of lipase per kilo per meal in cystic fibrosis. Compare that with any over-the-counter multi-enzyme: they are not in the same league and do not claim to be. If you have greasy stools that float, unexplained weight loss and a known pancreatic disease, what you need is a gastroenterologist, not a bottle. For everyday use we do have sensible things in digestive system, including Molkosan fermented whey concentrate, which is a fermented food and promises to correct nothing.

3. Gas from pulses and brassicas: alpha-galactosidase

This one really is an enzyme all of us lack: humans do not produce alpha-galactosidase, so the raffinose and stachyose in chickpeas, beans and broccoli reach the colon intact, where bacteria ferment them and produce gas. Adding the enzyme with the meal has sound mechanical logic.

The evidence is thin, and it deserves exactly that word. The best trial is by Di Nardo and colleagues (BMC Gastroenterology, 2013): 52 children aged 4 to 17, 27 on alpha-galactosidase and 25 on placebo, three doses a day for two weeks. The enzyme reduced global distress compared with placebo (p = 0.02). It is a small trial, in children, and it is the best published evidence there is. No authorised health claim exists for this enzyme.

And the alternative costs nothing: a long twelve-hour soak, discard the soaking water, long cooking, and increase the portion gradually instead of going from none to a plate of beans. It works because the oligosaccharides are water-soluble and leave with the water. It is set out with figures in the post on how much fibre per day. In the catalogue, the reference in this family is Sura Vitasan's vegetable enzymes, and fermentation does part of the job in advance in fermented and precooked foods.

4. Bloating with no diagnosis: the best-selling scenario and the worst supported

This is where 80 % of multi-enzymes are sold, and where there is neither an authorised claim nor a large trial to support it. We write this while selling them, because it is what the data say: the Naturitas Essentials digestive enzyme bottle is a legitimate, well-formulated product, but if your bloating comes from eating in nine minutes, from raising fibre all at once, or from the polyols in «sugar-free» products, the capsule will not fix any of the three.

The list of what to check first is short and dull: how fast you eat, sudden jumps in fibre, sorbitol and maltitol in chewing gum and sugar-free products, fizzy drinks, lactose and fructose. That review is set out in the post on the digestive reset after summer. If what is missing is bulk and regularity, the route runs through fibre and through plants and extracts with a history of traditional use, not through adding proteases.

And the sentence that really matters: if you have been bloated for months and there is also weight loss, blood, anaemia or waking at night in pain, what you need is not an enzyme, it is a diagnosis. No capsule replaces that.

5. Gluten: what no enzyme on the market does

This is the most dangerous myth in the category, so here is the citation in full. Janssen and colleagues (PLOS ONE, 2015) tested five commercially available digestive enzyme supplements and found that they leave the nine immunogenic epitopes largely intact in the 26-mer and 33-mer gliadin fragments. The paper's conclusion is literal: currently available digestive enzyme supplements are ineffective in degrading immunogenic gluten epitopes.

The experimental enzyme AN-PEP, a prolyl endopeptidase from Aspergillus niger, did degrade all nine epitopes within the pH range of the stomach in the laboratory. But taken to patients — World Journal of Gastroenterology, 2024: 40 coeliac patients on a long-term gluten-free diet, 650 mg per meal for four weeks — it did not significantly reduce gluten immunogenic peptides in stool compared with placebo, although symptom intensity did improve (p < 0.03). That is promising and ambiguous, not a licence to eat bread.

Conclusion, with no hedging: no enzyme replaces the gluten-free diet in coeliac disease. The legal threshold for labelling a food «gluten-free» is 20 mg/kg, set by Commission Implementing Regulation (EU) 828/2014, and it remains the only criterion that protects a coeliac. We sell one reference in this family, Santiveri's Flor Intollerance Glut, and everything you have just read applies to it as well. The pantry has certified gluten-free products, and that is the right route.

6. How to read the label in thirty seconds

Look for activity units, not milligrams. An enzyme is measured by what it does, not by what it weighs: FCC for lactase — and the figure that matters is 4,500 per dose, the one in the claim — Ph. Eur. units for lipase, GalU for alpha-galactosidase, HUT or SAPU for proteases. If the label says only «enzyme complex 500 mg», there is no way to know the dose or compare it with anything, and that is precisely why it is written that way.

Second: check when it says to take it. An enzyme has to meet its substrate in the stomach, so it is taken with the meal, not half an hour later. Third: look at the actual name of the active ingredient, because marketing leans on pretty names. Solaray's Papaya Enzime is papain, and papain has no authorised health claim in the European Union; the same goes for bromelain from pineapple. They are fine as what they are — plant extracts with a long history of use — and poor as a digestive promise.

For comparison, our own references are N Pro's Enzimdigest and NaturBite's digestive enzymes, both in digestive and probiotic enzymes.

The enzymes, one by one

What to do depending on what you feel

The shopping list

Ordered by what actually changes something, from food to supplement. First the fermented, where the enzyme comes as standard: cheeses, the rest of the refrigerated shelf including yoghurt and kefir, and the fermented and precooked range, sauerkraut and kimchi included. Then what has to be cooked properly: pulses in bulk so you can weigh the exact portion, the rest of the pantry, seasonal vegetables and fresh fruit, which is where real papaya and pineapple live. If you want it all sorted without thinking, there are the organic baskets.

And after that, only if needed, the bottle: lactase if you are going to keep drinking milk, the rest of digestive and probiotic enzymes, the digestive system shelf, plants and extracts for after-meal infusions, vitamins and minerals if there is a documented deficiency, and superfoods if what you are after is nutrient density. Whatever is reduced is in offers.

Do you need digestive enzymes?

For most people, no. A healthy pancreas secretes plenty of enzymes for a normal diet, and adding more speeds nothing up. This costs us sales and we write it anyway, for the same reason we write that most people buying a tub of protein already meet their reference intake: a customer who buys what they do not need does not come back.

There are two exceptions, both well defined. If you digest lactose poorly and want to keep drinking milk, lactase at 4,500 FCC units is the only tool with regulatory backing. And if you have diagnosed pancreatic insufficiency, what you need is a prescription. For everything else, the money goes further on fermented dairy and well-cooked pulses than on the supplement aisle.

Where to buy digestive enzymes in Barcelona and Sant Cugat

Our digestive and probiotic enzymes are available in the online shop and in our three stores, all in the Barcelona area, in Spain:

• Provença 242, 08008 Barcelona — in the Eixample, between Enric Granados and Balmes.
• Còrsega 78, 08029 Barcelona — Eixample, near Sants station.
• Antoni Bell 2, 08174 Sant Cugat del Vallès — in Volpelleres, next to the station.

You can call +34 683 118 961 or write to linverd@linverd.com before coming. And here is what a shop can do that an Amazon listing cannot: turn the bottle round and count the FCC units on the label with you. If they are not declared, we say so and you do not take it home. And if, as we talk, it turns out that fresh milk is the problem but aged cheese is fine, we cut the cheese at the counter and you save the whole bottle. That is a two-minute conversation with someone in front of you, and there is no way to package it into a buy button.

Frequently asked questions

What do digestive enzymes actually do?

Each enzyme breaks one specific bond: lactase breaks lactose, lipases break fats, alpha-galactosidase breaks the oligosaccharides in pulses. They do not add digestive capacity, they replace the one that is missing. If no enzyme is missing, there is nothing to replace and the supplement changes nothing.

How many lactase units do I need?

The authorised claim in the European Union requires a minimum of 4,500 FCC units per dose, with every lactose-containing meal. Below that figure a product cannot use the claim. If the label gives only milligrams and no FCC units, there is no way to know the dose you are getting.

Do digestive enzymes help with bloating?

There is no authorised claim and no large trial to support it. Diffuse bloating almost always comes from eating speed, a sudden jump in fibre, the polyols in sugar-free products or fizzy drinks. It is worth checking all of that before buying a multi-enzyme blend.

Can a coeliac take enzymes and eat gluten?

No. A study published in PLOS ONE in 2015 tested five commercial supplements and found they leave all nine immunogenic gliadin epitopes intact. No enzyme on the market replaces a strict gluten-free diet, with the legal threshold of 20 mg/kg as the only reliable criterion.

Do papain or bromelain help digestion?

They have no authorised health claim in the European Union for digestion. They cut proteins in vitro, but the digestive effect has not been demonstrated to EFSA. They are plant extracts with a long history of traditional use, and that is different from a claim of efficacy.

Should enzymes be taken before or after eating?

With the meal. An enzyme has to meet the food it is going to break down in the stomach, so taking it half an hour later achieves little. The condition of use for the lactase claim says exactly that: with each lactose-containing meal.

Where can I buy digestive enzymes in Barcelona or Sant Cugat?

In our shops at Provença 242 and Còrsega 78 in Barcelona and Antoni Bell 2 in Sant Cugat del Vallès, as well as the online shop. You can call +34 683 118 961 beforehand to check the range and the units each brand declares.

Further reading

If you got this far looking to sort out your digestion, the order we suggest is this: first get the digestive routine back, then reach 25 g of fibre, then the fermented foods that actually contain live bacteria, and only at the end, if needed, choose carefully which probiotic to take. Enzymes are the last box, not the first. And if what you are after is better sleep or less background noise, there is the post on magnesium.

You can see everything we have published on the health blog, or ask us for what you need in the online shop and at Provença 242, Còrsega 78 and Antoni Bell 2.

This information is for general guidance and does not replace advice from a healthcare professional. Food supplements are not medicines and should not be used as a substitute for a varied, balanced diet or a healthy lifestyle. If you have persistent digestive symptoms, weight loss, blood in your stools, or diagnosed pancreatic, liver or coeliac disease, speak to your doctor or pharmacist before taking any supplement. Do not exceed the recommended daily dose.