Overview

Digestive enzymes, explained

Digestive enzymes help break food into smaller components that can be absorbed. Normal digestion uses enzymes from several organs. NIDDK describes lactase products as one option that can help some people manage lactose intolerance; broader supplement claims need their own evidence.

Quick answer

AmylaseBreaks down starches into sugars. Made in saliva and the pancreas.
ProteaseHelps break down proteins into smaller peptides and amino acids. Protein digestion involves the stomach and pancreatic enzymes.
LipaseHelps break down dietary fats. Pancreatic enzymes are an important part of fat digestion.
LactaseBreaks down lactose. Lactase is made in the small intestine; reduced lactase production after infancy is common, but not everyone with malabsorption has symptoms.

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 — Small acute randomized trials; routine or long-term benefit not established. 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.

Exocrine pancreatic insufficiency (EPI) involves pancreatic enzymes not reaching, mixing with food or working effectively in the small intestine. NIDDK describes medical diagnosis and clinician-prescribed pancreatic enzyme replacement therapy (PERT); a retail digestive-enzyme supplement should not be treated as an interchangeable substitute.

Safety and medical boundaries
  • 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); NIDDK — Your Digestive System & How it Works. Last reviewed: July 28, 2026.

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