Digestive enzymes, explained
Digestive enzymes break food into absorbable pieces. Your body already makes a full set of them, and the clearest over-the-counter use case is lactase for lactose intolerance — most other uses range from limited evidence to entirely out of scope for a supplement.
Quick answer
Where each use case stands
- Lactase for lactose intolerance — Well documented. Read the guide →
- Alpha-galactosidase for gas from beans and vegetables — Mixed evidence. Read the guide →
- Protease for high-protein diets — Limited, plausibility-based evidence. Read the guide →
- General multi-enzyme blends for IBS and bloating — Limited evidence for broad claims. Read the guide →
- Exocrine pancreatic insufficiency (EPI) — Out of scope for an OTC product — requires medical diagnosis and prescription treatment. Read the guide →
Where supplements fit, and where they don't
Over-the-counter enzyme supplements are an attempt to add to, or substitute for, the body's natural supply in specific situations. Beyond lactase, over-the-counter multi-enzyme blends are marketed for general digestion, bloating, and high-protein diets, but the research behind these broader claims is limited and mixed.
If enzyme production fails at the source — most seriously in exocrine pancreatic insufficiency (EPI), where the pancreas doesn't make enough digestive enzymes — the standard of care is a medical diagnosis followed by prescription pancreatic enzyme replacement therapy (PERT), dosed by a clinician. That is not the same product category as an over-the-counter enzyme supplement.
- If you have symptoms like chronic greasy or floating stools, unexplained weight loss, or a known pancreatic condition, the right next step is a doctor, not another supplement.
Sources: NIDDK — Lactose Intolerance; NIDDK — Exocrine Pancreatic Insufficiency (EPI). Last reviewed: July 28, 2026.