Digestive Enzymes: Do You Actually Need Them?

A customer emailed us a few weeks back asking which of our digestive enzyme products would be best for the heavy, bloated feeling she gets after dinner. Fair question. The honest answer began with "possibly none of them," which is an unusual way to run a shop, but there you go.

So let's do this properly. If you are a healthy adult with a working pancreas, you are already producing all the digestive enzymes you need, and a supplement is unlikely to change much. There are specific situations where they genuinely earn their place though. However, most people asking about them are not in one of those situations.

That's the short answer. The long answer is more interesting, because the exceptions are where this gets interesting and useful.

Where your enzymes actually come from

Your body is already running a fairly serious enzyme operation, and it starts before the food reaches your stomach. Amylase in your saliva begins on the carbohydrates while you're still chewing. Your stomach adds acid and pepsin for protein. Then the pancreas does the heavy lifting, dumping protease, amylase and lipase into the small intestine - protein, carbs and fat respectively - while the intestinal lining handles the finer work on sugars.

A healthy pancreas produces these in significant excess. That's the bit the supplement industry tends to skip over. The system is built with enormous headroom, which is why you can eat a Christmas dinner that would knock out a horse and still be standing.

Uncomfortable, but standing.

What the research actually supports

The evidence here, splits cleanly into two piles.

The first pile is solid. Where the pancreas genuinely isn't producing enough enzyme - a medical situation, diagnosed by a doctor, not something you work out from a blog - enzyme replacement is well-established clinical practice and it isn't controversial. That's not supplement territory. That's prescription territory, and if you think it might be you, the person to talk to is your GP, not us.

The second pile is thinner. A 2016 review in Current Drug Metabolism by Ianiro and colleagues surveyed enzyme supplementation across a range of gastrointestinal conditions and found the picture outside pancreatic insufficiency considerably less settled - some promising signals, small studies, and a fairly consistent call for better trials. An earlier review by Roxas in Alternative Medicine Review reached a broadly similar place: plausible mechanisms, encouraging reports, not enough good data to be definitive.

Honest caveat: "not enough good data" is not the same as "doesn't work." It means nobody has done the trials properly yet. A lot of supplement marketing in this space presents the first pile's certainty while selling you the second pile's product, and it does the whole category a disservice.

The one that's nailed down - and the Irish twist

There is one enzyme where the evidence is genuinely strong, and it's lactase. It's one of the very few enzyme claims actually authorised under EU rules, on the basis that lactase improves lactose digestion in people who have difficulty digesting lactose. Straightforward stuff: the enzyme does the job your own gut isn't doing.

Here's the twist, though, and it's gas when you think about it. Lactase persistence - the ability to keep digesting milk into adulthood - is not evenly spread across the world. Most of humanity loses it after childhood. Northern Europeans largely don't, and Ireland sits at the very top of that distribution. We are, genetically speaking, one of the most enthusiastically dairy-tolerant populations on the planet.

Which is a long way of saying that the enzyme with the best evidence behind it is the one the average Irish person is least likely to need. Several thousand years of drinking milk in the rain, and this is our reward.

So who might actually benefit?

Setting the medical cases aside, there are people for whom a broad-spectrum enzyme is a reasonable experiment rather than a waste of money:

Anyone past their mid-fifties or so. Digestive output does tend to decline with age - stomach acid as much as enzymes - and that's a gradual, normal thing rather than a disorder.

People eating in a way their gut isn't used to. A sudden jump in fibre, legumes or protein volume. Your enzyme profile adapts, but it takes a few weeks, and the interim can be unpleasant for everyone in the room.

People who eat late and large. Not a mechanism problem so much as a timing one, but it's the commonest version of the question we get.

And certain times of the year, frankly. Christmas is the obvious one. An Irish Christmas is not a meal, it's a fortnight-long, military style campaign - the dinner itself, then the leftovers, then the tin of Roses that somebody opens at eleven in the morning on Stephen's Day, the Guinness and whiskey, the second dinner at the in-laws. Nobody's digestion was designed for that, and nobody's pancreas got a say in the matter. Same goes for a wedding weekend, a long holiday, or any stretch where you're eating richer and later than you normally would for days on end. It's not that you've developed a deficiency. It's that you've voluntarily entered a fortnight of industrial-scale eating and your gut is telling you to put the fork down, you f***ing idiot.

That's the window where I think a broad-spectrum enzyme is a reasonable thing to have in the press. Not as a fix for anything - as a bit of help during a period you already know is going to be heavy.

"I'm on retatrutide and the heartburn is brutal - do I need enzymes?"

That's close to verbatim from a customer email, and we've had two like it in recent months. Both from people on a GLP-1 weight-loss drug, both saying the reflux was miserable, both having worked out for themselves that digestive enzymes might be the answer. It's worth addressing properly, because I suspect a lot more people are quietly in the same boat and not asking anyone.

Here's the mechanism, as best anyone understands it. GLP-1 receptor agonists work partly by slowing gastric emptying - food sits in the stomach longer, you feel full sooner and for longer, and you eat less. That's not a side effect, it's a large part of how the drugs do what they do. Delayed emptying, nausea and reflux are among the most commonly reported gastrointestinal complaints in the trial literature for this class.

Now the honest bit, in two halves.

You don't automatically need enzymes on one of these drugs, and anyone telling you that you do is selling something. The slowdown is the drug working as designed, not a shortage of anything. Food moving out of the stomach slowly is a plumbing problem, and enzymes are not plumbing.

But I'll give the other side its due, because it's the half people actually report. Food sitting longer ferments, and fermentation is where the gas, the bloating and the memorably awful sulfur burps come from. If more of that food is broken down before it starts sitting around, it's at least plausible there's less left to ferment. That's mechanism, not proof - I'm not aware of a trial testing enzyme supplementation specifically in people on GLP-1s, and until someone runs one, anybody claiming a result is ahead of the evidence.

One practical warning that matters more than either half. A lot of enzyme formulas - including both of the ones we sell - contain betaine hydrochloride, which is actually in there to raise stomach acid. If your main complaint is acid coming back up your throat, adding more acid is not obviously the move. Read the label before you buy anything, from us or anyone else.

And the boring advice is still the right advice. If you're on one of these drugs and the reflux is bad enough that you're searching for supplements at eleven at night, the conversation to have is with whoever prescribed it - dose, titration pace and timing are all adjustable, and that is a far bigger lever than anything in a capsule. If nobody prescribed it, and given what people are buying online now that's a real possibility, then that's the more important conversation and a digestive enzyme is not the answer to it.

We wrote about the wider GLP-1 picture in berberine vs GLP-1 medications, which covers what these drugs do and what the supplement alternatives realistically don't.

It might be the bacteria, not the enzymes

If your issue is bloating rather than digestion as such, the honest answer may be that enzymes aren't the lever at all - the bacteria might be. We went into that side of things in the gut-brain axis piece, and separately in what happens to your gut after a fast.

What we stock, since you asked

We carry the Feel Supreme Digestive Enzyme Complex - a broad-spectrum plant-derived blend with protease, amylase, lipase, bromelain and papain, plus betaine HCl for the stomach acid side and a handful of traditional carminative herbs. Ninety capsules, thirty days at the recommended dose, €26.95.

If you'd rather cover enzymes and bacteria in one go, Onnit's Total Gut Health bundles the enzyme blend with betaine HCl and two types of probiotic, and the rest of the range sits in gut health and digestion. Both stocked and shipped from Dublin.

Try one for a month. If nothing changes, stop - the money is better spent on the thing that actually is the problem. I'd rather tell you that now than sell you a second bottle.

Frequently Asked Questions

Do you actually need digestive enzymes?
Most healthy adults don't. A working pancreas produces protease, amylase and lipase in significant excess. Enzyme supplements make more sense in specific situations - declining digestive output with age, a sudden change in diet, or a stretch of unusually heavy eating - than as a daily default.

What do digestive enzymes do?
They break food down into components small enough to absorb. Protease handles protein, amylase handles carbohydrates, lipase handles fats, and lactase handles the milk sugar lactose. Your body makes all of these itself.

Do I need digestive enzymes on a GLP-1 weight-loss drug?
Not automatically. These drugs slow gastric emptying deliberately, which is how they reduce appetite - that's the drug working, not an enzyme shortage. Food sitting longer does ferment, so there's a plausible mechanism for enzymes reducing gas and bloating, but we're not aware of a trial testing it in people on GLP-1s. If reflux is the main complaint, note that many enzyme formulas contain betaine HCl to raise stomach acid, and talk to whoever prescribed the drug first.

When is the best time to take digestive enzymes?
With food, and generally with the largest meal of the day. They work on what's in the stomach, so taking them well before or after eating makes little sense.

Do digestive enzymes help with bloating?
They might, but bloating has several possible causes and enzyme sufficiency is only one of them. Gut bacteria and fermentation are often the bigger factor. If a month of enzymes changes nothing, the cause is probably elsewhere.

Food supplements should not be used as a substitute for a varied diet. If you have a diagnosed digestive condition, are taking medication, or are pregnant or nursing, talk to your doctor before starting any supplement.