Research review
Digestive enzyme deficiency: what the research does and doesn't show
Searches for "digestive enzyme deficiency" mostly want to know if bloating or gas means an enzyme shortage. Two real deficiencies exist — exocrine pancreatic insufficiency and lactase deficiency — both diagnosed with a doctor's test and treated at doses well above an over-the-counter blend.
The evidence doesn't support treating everyday bloating or gas as a sign of "digestive enzyme deficiency," and it doesn't support DigeZyme as a treatment for the real thing. Genuine deficiencies exist — exocrine pancreatic insufficiency and lactase deficiency are the two best-studied — but both are diagnosed with a doctor's test, not guessed from symptoms.
What the evidence doesn't support
It doesn't support self-diagnosing a "digestive enzyme deficiency" from symptoms like bloating, gas or fullness alone, and it doesn't support DigeZyme, or any over-the-counter enzyme blend, as a treatment for a real, medically diagnosed enzyme deficiency. The two enzyme deficiencies with established diagnostic tests and treatments — exocrine pancreatic insufficiency and lactase deficiency — are managed with prescription-strength or purpose-specific enzyme products, at doses far above what's in a general digestive-enzyme supplement like DigeZyme. A supplement isn't a substitute for that diagnosis or that treatment.
What the trials found
Exocrine pancreatic insufficiency (EPI) is the best-documented digestive enzyme deficiency: the pancreas stops making enough of its own enzymes, pancreatic lipase in particular, most often from chronic pancreatitis, cystic fibrosis, pancreatic surgery, or long-standing diabetes. A 2019 review describes how it's diagnosed — a fecal elastase test is the most commonly used noninvasive option — and notes that pancreatic enzyme replacement therapy (PERT) is the standard treatment. PERT is a prescription drug dosed in thousands of enzyme units per capsule, regulated separately from an over-the-counter supplement like DigeZyme, which is dosed in milligrams. A 2020 Cochrane review of 14 trials (641 people with cystic fibrosis) found only limited, low-to-moderate-quality evidence comparing different PERT formulations against each other — even the established treatment has real evidence gaps.
Lactase deficiency is the other well-studied one: many adults naturally stop producing much lactase after childhood, which shows up as bloating, gas or diarrhea after dairy. A crossover trial found that adding a lactase enzyme (from a yeast source) directly to milk before drinking it significantly reduced breath hydrogen and symptom scores in 30 adults with diagnosed lactose malabsorption, compared with untreated milk — a different lactase source than DigeZyme's, and added to the food rather than swallowed as a capsule.
DigeZyme's own clinical trial didn't test for or require a diagnosed enzyme deficiency at all: it studied 40 adults with functional dyspepsia, a diagnosis of persistent upper-digestive discomfort with no identifiable structural cause, and improved symptom scores over 60 days — useful context for that specific diagnosis, but not evidence of correcting a measured enzyme shortfall.
| Deficiency | How it's diagnosed | Established treatment | Evidence quality |
|---|---|---|---|
| Exocrine pancreatic insufficiency | Fecal elastase test | Prescription PERT, thousands of enzyme units/dose | 2020 Cochrane review: limited, low-to-moderate quality even for the established treatment |
| Lactase deficiency | Hydrogen breath test or dietary trial | Lactase added to food, or lactase capsules, at diagnosis-matched doses | Crossover trial: significant symptom reduction vs. untreated dairy |
Questions people ask
What are the signs of a digestive enzyme deficiency?
For exocrine pancreatic insufficiency, the recognized signs include greasy or floating stools, unintended weight loss, and diarrhea, alongside a relevant medical history (chronic pancreatitis, cystic fibrosis, pancreatic surgery, or long-standing diabetes). For lactase deficiency, it's bloating, gas or diarrhea specifically after dairy. General, occasional bloating or fullness after eating isn't, on its own, evidence of either.
How do you test for a digestive enzyme deficiency?
Exocrine pancreatic insufficiency is most commonly tested with a fecal elastase test. Lactase deficiency is usually assessed with a hydrogen breath test or a supervised dietary trial. Neither is self-diagnosed from symptoms alone.
Can digestive enzyme supplements fix a digestive enzyme deficiency?
For a medically diagnosed deficiency, the established treatment is a prescription-strength or purpose-matched enzyme product, at doses well above a general supplement like DigeZyme. DigeZyme hasn't been tested against a diagnosed enzyme deficiency, and it isn't dosed for that use.
When to talk to a doctor
Greasy or floating stools, unexplained weight loss, or persistent digestive symptoms after dairy are worth raising with a doctor, who can order the right test rather than leaving it to guesswork. See digestive enzymes and GI disease for more on diagnosed conditions, and who should not take digestive enzymes for who needs medical input before trying one.
Sources
- Exocrine pancreatic insufficiency: prevalence, diagnosis, and management A 2019 review describes exocrine pancreatic insufficiency as a real, diagnosable condition where the pancreas doesn't secrete enough of its own digestive enzymes, most often alongside pancreatic disease; it's identified mainly with a fecal elastase test and treated with prescription-strength pancreatic enzyme replacement therapy, not an over-the-counter supplement.
- Pancreatic enzyme replacement therapy for people with cystic fibrosis A 2020 Cochrane review of 14 trials in people with cystic fibrosis found only limited, low-to-moderate-quality evidence comparing prescription pancreatic enzyme formulations, used to prevent malnutrition and weight loss from diagnosed pancreatic insufficiency — a different, prescription-strength product used for the opposite goal of weight-loss marketing.
- Effect of exogenous beta-galactosidase in patients with lactose malabsorption and intolerance: a crossover double-blind placebo-controlled study A crossover trial found that adding a lactase enzyme (from a yeast source, not DigeZyme's) directly to milk before drinking it significantly reduced breath hydrogen and intolerance symptoms in adults with diagnosed lactose malabsorption, compared with untreated milk.
- Evaluation of the Safety and Efficacy of a Multienzyme Complex in Patients with Functional Dyspepsia: A Randomized, Double-Blind, Placebo-Controlled Study A 2018 placebo-controlled trial found that adults with functional dyspepsia who took DigeZyme (150 mg/day) for 60 days scored significantly better on several symptom questionnaires than those given a placebo, with no reported product-related side effects; the trial was run and funded by DigeZyme's own maker.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.