Protease

What Is Protease?

A digestive enzyme that breaks down proteins into amino acids and smaller peptides for absorption. Commonly added to digestive supplements.

Compare to Similar Ingredients

• vs. bromelain: Both are protein-digesting enzymes. Protease is a general term for any protein-breaking enzyme (often microbial), while bromelain is a specific protease from pineapple with anti-inflammatory properties.
• vs. papain: Both are proteolytic enzymes that break down proteins. Protease is a broad category (often from bacteria/fungi), while papain is a specific plant protease from papaya.

Why Manufacturers Add Protease to Dog Food

Protease is a protein-digesting enzyme added to dog supplements and functional foods to support protein breakdown in the small intestine—it's most clinically important for dogs with exocrine pancreatic insufficiency (EPI) who lack adequate endogenous protease, but is also included in general digestive enzyme blends for sensitive stomach support.

• Helps break down dietary proteins
• May reduce protein-related digestive upset
• Supports nutrient absorption
• Can benefit dogs with exocrine pancreatic insufficiency (EPI)

Protease Quality Considerations

When evaluating protease in dog products, it's important to understand clinical evidence, appropriate dosing, and targeted health benefits. Protease activity is destroyed by heat — it's most useful when added post-extrusion to assist protein digestion in dogs with reduced pancreatic function. Pre-cooking inclusion contributes minimal enzyme activity by the time the food is consumed.

Protease: What the Research Shows

Protease is a broad category of enzymes that break down proteins into smaller peptides and amino acids. In pet supplements, proteases are added to support protein digestion, though healthy dogs produce adequate digestive enzymes naturally.

Key Research Findings

• Proteases cleave peptide bonds in dietary proteins, breaking them into absorbable amino acids and small peptides
• Dogs naturally produce proteases (pepsin in the stomach, trypsin and chymotrypsin from the pancreas) for protein digestion
• Supplemental proteases are most beneficial for dogs with exocrine pancreatic insufficiency (EPI) or other digestive disorders, not healthy dogs
• Different proteases work at different pH levels; comprehensive formulas include multiple types (acid, neutral, and alkaline proteases)
• Protease activity is measured in various units (HUT - Hemoglobin Unit Tyrosine; USP units), and standardization ensures consistent potency
• Limited evidence that protease supplementation benefits healthy dogs with normal pancreatic function
• Generally safe; enzymes are proteins that are themselves digested if not active

Evidence Level: Strong evidence for benefit in dogs with EPI or maldigestion. Weak evidence for benefits in healthy dogs with normal digestive function.

Finding Protease on Pet Food Labels

What to Look For

Protease appears in digestive enzyme supplements, some specialty foods, and products marketed for digestive support. Since the term "protease" is broad (covering many enzyme types), quality products specify enzyme types and activity units. Context and standardization matter significantly.

Alternative Names

• Protease — General category name
• Acid protease — Works in stomach (low pH)
• Alkaline protease — Works in intestines (high pH)
• Fungal protease — Source specification
• Bacterial protease — Source specification

Green Flags

• Activity units specified (e.g., "protease [50,000 HUT]") — Standardized, quality-controlled enzyme
• Multiple protease types listed — Comprehensive pH range coverage
• In digestive support supplements — Appropriate use for targeted digestive concerns
• Combined with other digestive enzymes — Amylase, lipase create full-spectrum support

Red Flags

• No activity units specified — Unknown potency; could be ineffective
• In heavily processed kibble — High heat likely deactivates enzymes

What's Normal

Protease supplementation is most beneficial for dogs with diagnosed digestive disorders. For healthy dogs, benefit is unclear. Look for standardized activity units and appropriate product formats (supplements, freeze-dried) for enzyme stability.

Typical Position: In enzyme supplements, protease appears in positions 3-10. Meaningful inclusion requires specified activity levels.

Frequently Asked Questions

Related Reading

Learn more: Digestive Enzymes for Dogs: Guide & Dosing · Cat Digestive Issues: Causes, Signs & What Actually Helps · Digestive Enzymes for Cats: EPI, Pancreatitis, IBD & When They Help