Digestive Enzymes: Do They Really Help or Just Waste Money?

Digestive enzymes are among the best-selling supplements worldwide, found in almost every pharmacy and health food store. The marketing promise is simple and tempting: one swallow before a meal, and no more bloating, gas, heaviness, or discomfort after eating. In an era where millions suffer from digestive symptoms, this is a promise worth billions of dollars a year.

But there is a huge gap between the marketing promise and what science actually shows. The uncomfortable truth is that most healthy people don't need digestive enzymes at all. The body produces its own complete set of enzymes needed to break down fats, proteins, and carbohydrates. For them, the supplement is mostly a waste of money. Yet, there are defined groups where digestive enzymes are not just beneficial, but truly life-changing. This article separates the marketing from the evidence.

What Are Digestive Enzymes?

Digestive enzymes are proteins that break down food into small components the body can absorb. Without them, food would pass through the digestive system undigested. A healthy body produces them on its own, mainly in the pancreas, stomach, and small intestine. These are the main enzymes:

• Amylase, breaks down starch and carbohydrates into simple sugars.
• Protease, breaks down proteins into amino acids.
• Lipase, breaks down fats into fatty acids.
• Lactase, breaks down lactose, the sugar in milk. This is the enzyme lacking in people with lactose intolerance.

Digestive enzyme supplements on the market typically contain a blend of all these, and sometimes also cellulase, which breaks down plant fiber. Most are derived from fungal fermentation or from pig pancreatic tissue.

Who Really Needs Digestive Enzymes?

This is the crucial question, and here the difference between evidence and marketing is fully revealed. There are three main groups where digestive enzymes are supported by real evidence:

• People with lactose intolerance, who lack the enzyme lactase and therefore cannot digest milk sugar. A lactase supplement solves this exact problem.
• People with exocrine pancreatic insufficiency, a condition where the pancreas doesn't produce enough enzymes, common in chronic pancreatitis, cystic fibrosis, and after pancreatic surgery.
• People with functional bloating or functional dyspepsia, where there is preliminary evidence of benefit.

And there is a fourth, less defined group: age-related decline in enzyme production. With aging, stomach acid production and enzyme activity decrease in some people, which may contribute to a feeling of heaviness after large, fatty meals. Here the picture is less clear, but this is why digestive enzymes receive a yellow rating rather than green: they are beneficial for some people, but definitely not for everyone.

The Current Evidence

Let's dive into the actual numbers. The following three studies represent the three groups with proven benefit.

Study 1: Digestive Enzymes and Functional Dyspepsia from 2023

A randomized, double-blind, placebo-controlled trial published in the journal Biomedicine & Pharmacotherapy in December 2023 tested an enzyme blend supplement on people with functional dyspepsia, i.e., bloating, fullness, and heaviness after eating without a structural cause. 120 participants aged 18-59 were randomly assigned to receive an enzyme supplement or placebo for two months. The group receiving digestive enzymes showed statistically significant improvement in dyspepsia scores (NDI-SF), pain intensity (VAS), and sleep quality (PSQI), with no side effects. This is quality evidence, but it's a single study with a moderate sample size, so it should be interpreted with caution.

Study 2: Lactase and Lactose Intolerance

A randomized, placebo-controlled crossover trial examined lactase supplementation in people with diagnosed lactose intolerance. Results showed improvement in clinical symptoms, mean clinical score, and hydrogen levels in breath, an objective measure of lactose breakdown in the gut. Simply put: when you lack lactase, a lactase supplement works. However, a broader systematic review indicates that the overall quality of evidence is limited and not always consistent, and that for some people, avoiding lactose or using lactose-free dairy products is equally effective.

Study 3: Enzyme Therapy in Pancreatic Insufficiency

This is the group with the strongest evidence. A systematic review and meta-analysis examined pancreatic enzyme replacement therapy (PERT) in patients with chronic pancreatitis. The treatment significantly improved the coefficient of fat absorption, reduced fat and nitrogen excretion in stool, reduced abdominal pain, and improved body weight and quality of life, with no significant side effects. In these cases, digestive enzymes are not an optional supplement but a necessary medical treatment, given by prescription at high doses, not as an over-the-counter supplement.

What About the Aging Digestive System?

One reason digestive enzymes are especially popular among older adults is the feeling of heaviness that increases with age after large meals. With aging, stomach acid production decreases in some people, and enzyme activity may also decline slightly. This can explain why a person who ate easily at age 30 feels bloated after the same meal at age 65.

But it's important to be honest: a mild age-related decline is not clinical enzyme insufficiency. For most healthy older adults, the body still produces enough enzymes. The feeling of heaviness often stems more from meal size, slowed gut motility, or eating habits, rather than a true enzyme deficiency. Therefore, before rushing to a supplement, it's worth trying smaller meals, eating slowly, and chewing thoroughly.

Should You Start Taking Digestive Enzymes?

Here comes the critical part, and this is what separates an educational article from an advertisement. For most healthy people, digestive enzymes are a waste of money. Here are the considerations:

• A healthy body provides its own enzymes for free. If you don't have a defined medical condition, the supplement adds nothing your body isn't already doing.
• The cost adds up, a quality enzyme supplement costs between 60 and 150 shekels per month, a significant amount over years for a benefit that for most of you will be zero.
• Digestive symptoms can mask a real problem. Bloating and abdominal pain can indicate celiac disease, IBS, SIBO, or other conditions that require diagnosis. Swallowing enzymes instead of investigating the cause delays proper treatment.
• Safety is high, but not absolute, most people tolerate digestive enzymes well, but at high doses they can cause nausea, diarrhea, or abdominal pain.

The bottom line: if you have lactose intolerance, a diagnosis of pancreatic insufficiency, or persistent functional dyspepsia, there is a basis to try. If you are healthy and just occasionally bloated, your money is better spent on quality food, fiber, and smaller meals. For those who still want to try, you can purchase digestive enzymes on iHerb.

What to Take Away from the Research?

1. Diagnose before you swallow. If you have persistent digestive symptoms, see a doctor before buying a supplement. Chronic bloating can indicate celiac disease, IBS, or SIBO, conditions requiring entirely different treatment.
2. For lactose intolerance, targeted lactase works. If you are sensitive to dairy, a lactase supplement taken before consuming dairy is evidence-supported. As an alternative, lactose-free dairy products are equally effective.
3. Take with large meals. If you try digestive enzymes, take the dose at the start of large, fatty meals, where the potential benefit is highest. There's no point taking them on an empty stomach.
4. Try behavioral changes first. Smaller meals, eating slowly, thorough chewing, and reducing processed food solve much of the feeling of heaviness without any supplement.
5. If you are healthy, save your money. Your body already produces all the enzymes you need. Instead, invest in a fiber-rich diet that nourishes your good gut bacteria.

The Broader Perspective

The story of digestive enzymes is a perfect example of a principle that repeats itself again and again in the supplement world: a supplement only helps when it fills a real deficiency. When the body truly lacks lactase or pancreatic enzymes, these supplements are life-changing. When the body is healthy and functioning, they simply pass through without benefit.

This is exactly why digestive enzymes receive a yellow rating from us, not green or red. They are not worthless, but they are certainly not necessary for everyone. The yellow rating marks precisely this: a supplement with real benefit in certain circumstances, and no clear benefit for most people. Instead of chasing a magic pill for digestion, the most powerful path to good gut health is a diverse, fiber-rich diet, physical activity, and attention to your body's signals. Want to know exactly which supplements suit your goals? Try our personal supplement selector.

References:
Efficacy of digestive enzyme supplementation in functional dyspepsia: A randomized, double-blind, placebo-controlled clinical trial, Biomedicine & Pharmacotherapy, 2023
Effect of lactase on symptoms and hydrogen breath levels in lactose intolerance: A crossover placebo-controlled study, 2021
Efficacy of pancreatic enzyme replacement therapy in chronic pancreatitis: systematic review and meta-analysis, 2017