Exogenous vs. Endogenous Enzymes: Supplemental Enzymes Explained

Endogenous enzymes are those your body produces naturally — pepsin in the stomach, pancreatic lipase, brush border enzymes, and so on. Exogenous enzymes come from outside the body, either from food (like bromelain from pineapple or papain from papaya) or from microbial fermentation (fungal-derived enzymes are common in supplements).

How Food-Derived Enzymes Work

Plant- and fungal-derived enzymes often have broader pH stability than human digestive enzymes, allowing them to function in the acidic stomach environment where human pancreatic enzymes would be denatured. This is why some supplemental enzyme blends can begin working in the stomach, complementing the body's own enzyme production.

Proteolytic Enzymes Beyond Digestion

Some exogenous enzymes — particularly bromelain, serrapeptase, and nattokinase — are used systemically (taken on an empty stomach so they're absorbed rather than used for food digestion). These proteolytic enzymes have been researched for anti-inflammatory, fibrinolytic, and immune-modulating effects.

For the cofactors that all enzymes need to function, see Enzyme Cofactors.