Digestive enzymes: do they work and who actually needs them?

• 8 min read
• Updated: November 1, 2026
• 6 sources cited

Digestive enzymes are proteins that break food down into pieces small enough to absorb, and a healthy body already makes the main ones: amylase, protease and lipase in the pancreas, and lactase in the small intestine. Supplements make the most sense in specific cases: lactase for people who have difficulty digesting lactose (the only enzyme with an EU-authorized claim, at 4,500 FCC units per meal), and prescription pancreatic enzymes, which are a medical treatment, not a supplement. For everything else, the evidence is limited.

Digestive enzymes: the essentials in 30 seconds

What digestive enzymes are and what your body already makes

Digestion is chemistry. Enzymes cut long molecules into short ones: starch into sugars, proteins into amino acids and small peptides, fats into fatty acids. According to Johns Hopkins Medicine, the pancreas produces the main three (amylase, lipase and protease), while the small intestine makes lactase and sucrase, which split lactose and table sugar.

That's why the starting point for most people is simple: if your digestive system is healthy, you already produce these enzymes in the amounts your meals need. Johns Hopkins puts it bluntly: a healthy person really doesn't need to take digestive enzyme supplements.

Supplements add enzymes from outside the body. Most come from fungi (such as Aspergillus oryzae), from fruit (bromelain from pineapple, papain from papaya) or, in prescription products, from animal pancreas.

Who actually needs digestive enzymes

There are two very different situations, and it helps not to mix them up.

Prescription pancreatic enzymes

When the pancreas can't release enough enzymes, doctors prescribe pancreatic enzyme replacement therapy (PERT). Johns Hopkins describes it as the most common and the only FDA-regulated enzyme replacement therapy. A 2016 review by Ianiro and colleagues notes that these animal-derived enzymes are the established standard of care. This is a medical treatment chosen and dosed by a doctor, and an over-the-counter supplement is not a substitute for it.

Over-the-counter supplements

Supplements are a different category. In the US, Johns Hopkins notes they aren't regulated by the FDA the way PERT is, so enzyme amounts and activity can vary from brand to brand. In the EU they are sold as food supplements, and only effects authorized by the European Commission can be claimed. For digestive enzymes, that list has one entry: lactase.

Lactase: the only digestive enzyme with an EU-authorized claim

We're a European company, and EU Regulation 432/2012 authorizes this claim for lactase in food supplements, after a favorable EFSA opinion in 2009:

"Lactase enzyme improves lactose digestion in individuals who have difficulty digesting lactose." Minimum dose of 4,500 FCC units, with instructions to take it with each lactose-containing meal. The target population should also be told that tolerance to lactose is variable and that they should seek advice on the role of lactase in their diet.

Regulation (EU) 432/2012

FCC stands for Food Chemicals Codex, the standard that defines how lactase activity is measured. The practical consequence: a label that only lists lactase in milligrams, or doesn't state FCC units, doesn't let you check whether it meets the 4,500-unit condition.

The research behind it is consistent. In a 2010 randomized trial of 60 people with lactose intolerance, Ojetti and colleagues gave lactase (tilactase) 15 minutes before a lactose breath test; compared with placebo, more participants had a normal test result and the breath hydrogen peak was lower.

What the evidence says about other digestive enzymes

Alpha-galactosidase acts on the oligosaccharides in beans, lentils and some vegetables, which the human body can't break down on its own. In a small 2007 placebo-controlled study (Di Stefano et al.), 8 healthy volunteers ate 420 g (about 15 oz) of cooked beans with 300 or 1,200 GalU of alpha-galactosidase or placebo; the 1,200 GalU dose lowered the hydrogen measured in their breath. It's a promising signal from a very small sample, and there is no EU-authorized claim for this enzyme.

Protease, lipase and amylase blends from fungal or plant sources are widely sold, but the Ianiro review describes them as an area of future promise rather than established use, and the evidence in healthy people is thin. Bromelain and papain have no authorized claim either.

Because enzymes are not nutrients, neither EFSA nor the NIH sets a tolerable upper intake level for them. The reference is the daily dose on the label, which you shouldn't exceed.

How to read a digestive enzyme label

1. Find the serving: per capsule or per 2 capsules. Every number refers to it.
2. Look for activity units, not just milligrams. Enzyme strength is measured by activity: FCC units for lactase, GalU for alpha-galactosidase, and other units such as HUT for protease or GDU for bromelain. Weight alone doesn't tell you how active the enzyme is.
3. Match the enzyme to the food: lactase for dairy, alpha-galactosidase for beans, broad blends for mixed meals.
4. Be wary of proprietary blends that list ingredients without amounts or units.
5. Check the claims: in the EU, anything beyond the lactase wording isn't authorized.
6. Work out the cost per day: price divided by real servings, not by capsules.

Digestive enzymes vs. probiotics: not the same thing

They're often sold side by side, but they're different. Digestive enzymes are proteins that act on food in your gut and are used up in the process; they aren't alive. Probiotics are live microorganisms, identified by strain and counted in CFU. Some products combine both, so read the label for each part separately. If you're comparing probiotics, our guide on how to read probiotic CFU and strains covers what to look for.

When to take digestive enzymes

Enzymes work on the food that's in your gut at the same time, so timing matters more than with most supplements. Follow the label: most are taken just before or with a meal. The EU lactase claim specifically requires taking it with each lactose-containing meal. Taking an enzyme hours after eating, or on an empty stomach, makes little sense.

Start with the dose on the label and don't exceed it. If you notice any reaction, stop and talk to a healthcare professional; people with allergies should check the source of each enzyme (for example, pineapple for bromelain).

Frequently asked questions about digestive enzymes

Do digestive enzymes actually work?

It depends on the enzyme. Lactase has an EU-authorized claim for people who have difficulty digesting lactose, at 4,500 FCC units per lactose-containing meal. For most other enzyme blends, the evidence in healthy people is limited.

Should I take digestive enzymes before or after a meal?

Before or with the meal, as the label says. Enzymes act on food that's in your gut at the same time, so taking them hours later makes little sense.

Who should take digestive enzymes?

Johns Hopkins notes that a healthy person doesn't need them. Lactase can make sense if you have difficulty digesting lactose, and people whose pancreas doesn't release enough enzymes need prescription treatment from a doctor.

What's the difference between digestive enzymes and probiotics?

Enzymes are proteins that break down food; probiotics are live microorganisms counted in CFU. They're different things, even when a product combines both.

Can I take digestive enzymes every day?

Follow the daily dose on the label and don't exceed it. There's no EFSA or NIH upper limit for enzymes because they aren't nutrients. If you need them every day for ongoing symptoms, see a doctor.

Are digestive enzymes safe during pregnancy?

Talk to a healthcare professional first. The same applies if you're breastfeeding, taking medication, have a medical condition or are under 18.

Sources

• EU Regulation 432/2012 — authorized health claims (including lactase enzyme)
• EFSA — Scientific opinion on health claims related to lactase enzyme and breaking down lactose (EFSA Journal, 2009)
• Johns Hopkins Medicine — Digestive enzymes and digestive enzyme supplements
• Ianiro et al. Digestive enzyme supplementation in gastrointestinal diseases (Curr Drug Metab, 2016)
• Ojetti et al. Oral supplementation with Lactobacillus reuteri or tilactase in lactose intolerant patients: randomized trial (Eur Rev Med Pharmacol Sci, 2010)
• Di Stefano et al. The effect of oral alpha-galactosidase on intestinal gas production and gas-related symptoms (Dig Dis Sci, 2007)