Scores 35/35 for dosage transparency, 25/25 for a clean formula, 21/25 for label completeness. 20 ingredients disclosed with amounts.
capsule · 30 servings · $1.00/servingBuy on iHerb$29.99
Ranking
10 Best Digestive Health Supplements
Digestive enzymes and fiber are easy to label well and often labeled badly: enzymes have standard activity units, yet many products give only a milligram weight, which says nothing about activity. The top of this ranking is products that state activity in recognized units.
We ranked digestive enzymes, betaine HCl, lactase, fiber and gut-support products sold on iHerb by label quality.
Our top picks
Scores 35/35 for dosage transparency, 25/25 for a clean formula, 21/25 for label completeness. 4 ingredients disclosed with amounts.
capsule · 60 servings · $0.67/servingBuy on iHerb$39.99
Scores 35/35 for dosage transparency, 25/25 for a clean formula, 23/25 for label completeness. 2 ingredients disclosed with amounts.
capsule · 30 servings · $1.00/servingBuy on iHerb$29.99
Top 10 ranked
#ProductScoreFormServingsPrice
3
How we ranked them
Every product is scored 0–100 from its label data in the NIH Dietary Supplement Label Database: dosage transparency (35 points - are amounts stated per ingredient, or hidden in a proprietary blend?), label completeness (25), formulation cleanliness (25 - fillers, dyes, titanium dioxide and other non-active ingredients) and ingredient profile (15). The Top 10 admits only products scoring 60 or higher; among those, products with a verified retail listing are shown first so the list is one you can act on. No brand can pay to be included or moved up.
Forms and dosage
- Broad-spectrum digestive enzymes
- Protease, amylase and lipase. Activity should be stated in FCC units (such as HUT, DU, FIP), not milligrams.
- Single enzymes (lactase, alpha-galactosidase)
- Targeted at one food component, such as dairy or beans.
- Fiber (psyllium, inulin, glucomannan)
- Measured in grams; check the amount per serving against the label claim.
- Betaine HCl and ox bile
- Used to support stomach acid or fat digestion; not for people with ulcers.
How much to take
Adequate fiber intake is 25–38 g per day from food and supplements combined; psyllium products commonly provide 5–10 g per serving. Enzyme doses are product-specific; compare activity units, not weight.
Who it's for
Adults who want a specific digestive aid, such as lactase for dairy or a fiber supplement to reach daily intake.
What to watch out for
Enzymes listed by milligram weight only, proprietary enzyme blends, and betaine HCl if you have ulcers or take NSAIDs. Fiber supplements should be taken with plenty of water.
All Digestive Health products (5552)
1
CodeageLeaky Gut Formula
902CodeageGut Health Formula
893Advanced NaturalsColonMax
884Renew LifeCleanseSmart 2 Evening Formula
885vitafusionFiber Well Fit Sugar Free Gummies
886Renew LifeCleanse More
887Renew LifeCleanseSmart Advanced Total-Body Internal Cleanse 30-Day Program
888Renew LifeCleanseMORE
889Renew LifeCleansMORE
8810ecoNugenicsIntegrative Digestive Formula
8711Integrative TherapeuticsZinc-Carnosine
8612AOR Advanced Orthomolecular Research AdvancedGastro Relief
8613BioGenesis NutraceuticalsPanZyme
8614vitafusionFiber Well Fit
8615Life ExtensionGastro-Ease
8516Doctor's BestPepZinGI
8417Doctor's BestPepZin GI
8418Nutra BioGenesisPanZyme
8419Doctor's BestZinc Carnosine Complex With Pepzine GI
8420Innate Response FormulasGI Response
83Frequently Asked Questions
Why do enzyme labels use units like HUT and DU?
Because enzymes are judged by activity, not weight. A label that gives only milligrams cannot be compared with another product, and it scores lower on transparency.
Are digestive enzymes the same as probiotics?
No. Enzymes break down food; probiotics are live bacteria. Probiotics have their own ranking.
How are digestive health supplements ranked?
Products are ranked by SupplementScore, which evaluates label quality across four categories: dosage transparency (35 pts), label completeness (25 pts), formulation cleanliness (25 pts), and ingredient profile (15 pts). The score is based on data from the NIH Dietary Supplement Label Database, not marketing claims.
Does a higher score mean the supplement is more effective?
No. The SupplementScore measures label quality, how transparent, clean, and well-documented a product is. It does not measure clinical efficacy, bioavailability, or third-party testing. A higher score means better label practices, not guaranteed results.
How many digestive health supplements were analyzed?
We analyzed 5,552 digestive health products from the NIH DSLD database, which contains label data for over 116,000 dietary supplements sold in the United States.
This article is for information only and is not medical advice. Talk to a clinician before starting a supplement, especially if you are pregnant, take medication or have a health condition.