How to Choose a Digestive Enzyme Supplement: Activity, Sources and Format

July 28, 2026|Barry Lees

Caraway seeds illustrating a UK comparison of digestive-enzyme activity, sources, bottle duration and cost

This guide explains how to assess digestive enzyme supplements using the information on the label and product page.

It focuses on product categories, ingredient declarations, serving information, suitability and the limits of permitted claims. It does not rank or score competing brands.

Commercial disclosure: The Health Improvers sells food supplements in this category. Where one of our products is used as a worked example, it is clearly identified and assessed using the same label-reading principles.

A worked label example: Digestive Enzymes

Its point of difference is breadth outside the enzyme blend and complete ingredient disclosure: seven enzyme preparations, betaine hydrochloride and eight individually quantified botanicals in one vegan, UK-made formula.

It does not win this guide on directly comparable protease activity, lactase coverage, lowest daily cost or smallest capsule count. A shopper wanting those features should choose accordingly.

How should activity units be compared?

HUT can be compared with HUT when the serving and method match.
DU should not be ranked against SKB without a valid conversion for the exact materials.
FIP, FCC LU and an unnamed “lipase unit” are not automatically interchangeable.
GDU, PU and USP protease units are different tests and should not be added together.
Check whether figures apply per capsule, per meal or per daily serving.

Read our activity-units guide before treating any large number as proof of strength.

What may these products legally claim?

Lactase is the important authorised exception. A qualifying food supplement may state that lactase improves lactose digestion in individuals who have difficulty digesting lactose, provided it supplies at least 4,500 FCC units and uses the required directions and tolerance advice.

That does not authorise general claims to relieve bloating, heartburn, reflux, indigestion or digestive discomfort. Food supplements must not claim to treat symptoms or disease. Some botanical claims remain on hold, but they require exact matching wording, material and substantiation.

Safety and suitability

Persistent pain, reflux, diarrhoea, unexplained weight loss, blood in the stool or difficulty swallowing needs medical advice. Retail enzyme supplements should not be used instead of prescribed pancreatic enzyme replacement therapy.

Decision guide

Widest enzyme range and clearest qualifying lactase serving: Wellzyme Advanced.
Enzymes plus betaine HCl and eight declared botanicals: The Health Improvers.

Related guides

How this guide was prepared

We included four current UK products with readable official or major-retailer ingredient tables and directions on 2 August 2026. Prices were taken from the pages cited below. Daily-cost examples divide the bottle price by the example days supplied; they exclude subscriptions and multibuy promotions. We compared activity only where the unit and serving basis permit it and did not score customer reviews or promised outcomes.