Disclosure: We earn commissions on purchases made through our links. This never influences our scores. Editorial policy
Digestive Enzymes
Clinical dose: Varies by enzyme type and is measured in activity units, not milligrams. General broad-spectrum targets: 10,000-20,000 DU Amylase, 30,000-60,000 HUT Protease, 2,000-5,000 FIP Lipase per meal. For lactose intolerance: 3,000-9,000 ALU Lactase per dairy-containing meal.
At a Glance
Digestive enzyme supplementation has a well-established evidence base for specific clinical conditions but much weaker support for general digestive complaints. Prescription pancreatic enzyme replacement therapy (PERT) is the standard of care for exocrine pancreatic insufficiency (EPI), with a systematic review (PMID: 32023000) confirming significant improvements in fat absorption, nutrient status, and gastrointestinal symptoms. Our top pick is Super Enzymes (Grade: B, $0.15/day).
Quick Picks
What Is Digestive Enzymes?
Digestive enzyme supplementation has a well-established evidence base for specific clinical conditions but much weaker support for general digestive complaints. Prescription pancreatic enzyme replacement therapy (PERT) is the standard of care for exocrine pancreatic insufficiency (EPI), with a systematic review (PMID: 32023000) confirming significant improvements in fat absorption, nutrient status, and gastrointestinal symptoms. However, the doses used in EPI management are far higher than what over-the-counter products provide, and OTC enzymes are not a substitute for prescription PERT in diagnosed EPI. For lactose intolerance, the evidence is strong and straightforward. A double-blind crossover trial (PMID: 10436974) and a systematic review (PMID: 24696001) demonstrated that supplemental lactase taken immediately before dairy consumption significantly reduces hydrogen breath excretion and self-reported symptoms of bloating, cramping, and diarrhea. The effective dose is 3,000-9,000 ALU per meal, and the benefit is dose-dependent. For general bloating, IBS, and functional dyspepsia in people without diagnosed enzyme deficiency, the evidence is weak and inconsistent. A few small trials (PMID: 29477229, PMID: 30580710) have reported modest symptom improvements with broad-spectrum enzyme blends, but these studies are limited by small sample sizes, short durations, and methodological issues. Most gastroenterologists do not recommend OTC digestive enzymes for otherwise healthy individuals experiencing occasional bloating, as the underlying cause is more often related to diet, gut motility, or the microbiome rather than enzyme deficiency.
Does It Work? The Evidence
| Claimed Benefit | Evidence Level | Key Studies | Our Verdict |
|---|---|---|---|
| Reduces symptoms of exocrine pancreatic insufficiency (EPI) | Strong | Systematic review (PMID: 32023000): prescription PERT is standard of care for EPI, significantly improving fat absorption and GI symptoms | Works |
| Prevents bloating and diarrhea in lactose intolerance | Strong | Double-blind crossover trial (PMID: 10436974); systematic review (PMID: 24696001): supplemental lactase significantly reduces symptoms when taken before dairy | Works |
| Improves general bloating and digestion in IBS/dyspepsia | Weak | Small trials (PMID: 29477229, PMID: 30580710): modest symptom improvements reported but limited by small sample sizes and mixed results | Unproven |
How to Choose: Forms, Doses & What Matters
Clinical dose: Varies by enzyme type and is measured in activity units, not milligrams. General broad-spectrum targets: 10,000-20,000 DU Amylase, 30,000-60,000 HUT Protease, 2,000-5,000 FIP Lipase per meal. For lactose intolerance: 3,000-9,000 ALU Lactase per dairy-containing meal.
Best forms: Fungal/Microbial-derived enzymes (survive a wider pH range in the GI tract), Animal-derived Pancreatin (standard of care for exocrine pancreatic insufficiency), Targeted single enzymes (Lactase for dairy, Alpha-galactosidase for beans/legumes)
Take immediately before or with the first few bites of a meal. Digestive enzymes need to be present in the stomach alongside food to work. Match the enzyme to the food type: lactase before dairy, alpha-galactosidase before beans, broad-spectrum blends before mixed meals. Do not take on an empty stomach, as some enzymes (particularly protease and Betaine HCl) can cause gastric irritation without a food buffer.
The Scorecard: 10 Products Compared
Fast Act Lactase Enzyme Supplement
Lactaid
The gold standard for lactose intolerance. Delivers 9,000 ALU lactase per caplet, matching the upper clinical dose range. This is a targeted product - it only helps with dairy digestion, not general digestive complaints.
9,000 ALU lactase per caplet matches the upper range of clinically effective doses for lactose intolerance
Widely available pharmaceutical brand but no independent third-party supplement certification verified
$0.23/day - affordable targeted solution for lactose intolerance with clinically validated dosing
Clear labeling of lactase activity units (9,000 ALU), single-ingredient product with no hidden blends
Prices checked 2026-03-31. Cost shown is per clinically effective daily dose, not per pill.
Super Enzymes
NOW FoodsContains Betaine HCl and ox bile in addition to pancreatin, making it one of the most comprehensive single-capsule enzyme products. Not suitable for vegetarians or vegans due to animal-derived ingredients.
Combines pancreatin, Betaine HCl, and ox bile for comprehensive digestive support, though OTC evidence remains limited
UL Certified (formerly Underwriters Laboratories dietary supplement verification), a legitimate third-party program
$0.15/day - the best value broad-spectrum enzyme on the market by a wide margin
Full ingredient disclosure with activity units for enzymes, clear labeling of Betaine HCl and ox bile amounts
Prices checked 2026-03-31. Cost shown is per clinically effective daily dose, not per pill.
Digestive Enzymes
Doctor's BestIncludes Bacillus subtilis DE111 probiotic strain alongside the enzyme blend. Fully vegan and competitively priced, making it the best option for plant-based eaters.
Vegan broad-spectrum blend with reasonable enzyme activity, though clinical evidence for general use is limited
GMP certified facility but no independent third-party product-level testing verified
$0.16/day - excellent value for a vegan enzyme product with full activity unit disclosure
Full activity unit disclosure for all enzymes, no proprietary blends, clearly labeled as vegan
Prices checked 2026-03-31. Cost shown is per clinically effective daily dose, not per pill.
Essential Enzymes 500mg
Source Naturals
A well-established product with a long track record. Covers a broad range of enzyme types at a competitive price, though individual enzyme activity levels are moderate.
Multi-enzyme blend covering a range of substrates, but clinical evidence for general digestive support is limited
GMP certified facility but no independent third-party product testing verified
$0.20/day - strong value with 120 capsules per bottle at a competitive price point
Full enzyme disclosure with activity units listed for each enzyme, no proprietary blends
Prices checked 2026-03-31. Cost shown is per clinically effective daily dose, not per pill.
Digestive Enzymes
Zenwise
One of the best-selling enzyme supplements on Amazon. The proprietary probiotic blend is a transparency issue, and the enzyme activity per capsule is lower than products like Enzymedica Digest Gold.
Broad-spectrum enzyme blend with added probiotics, but enzyme activity levels are lower than competitors
GMP certified but no independent third-party testing verified for this product
$0.30/day for 180 servings - reasonable value given the capsule count, though enzyme potency is modest
Enzyme activity units are disclosed, but the probiotic component uses a proprietary blend without individual strain counts
Prices checked 2026-03-31. Cost shown is per clinically effective daily dose, not per pill.
Digest Gold with ATPro
Enzymedica
High enzyme activity per capsule with full activity unit disclosure. ATPro (ATP + magnesium) is a marketing addition with minimal clinical support for improving enzyme function.
Broad-spectrum blend with high enzyme activity per capsule, but clinical evidence for general digestive complaints is limited
Clean Label Project Certified, which verifies absence of contaminants but is not equivalent to USP or NSF certification
$0.61/day - mid-range pricing for a premium enzyme blend
Full activity unit disclosure for every enzyme, no proprietary blends, clear labeling of all ingredients and forms
Prices checked 2026-03-31. Cost shown is per clinically effective daily dose, not per pill.
Bio-Gest
ThorneThorne's practitioner-grade formulation combining pancreatin with Betaine HCl. The TGA facility certification is a meaningful quality signal, though it certifies the facility rather than each individual product batch.
Animal-derived pancreatin with Betaine HCl mirrors the approach used in clinical settings for EPI, though at OTC doses
Manufactured in a TGA (Australian Therapeutic Goods Administration) certified facility, a rigorous international standard
$0.73/day at 2 capsules per meal - premium pricing typical of Thorne products
Full ingredient disclosure with enzyme activity units, no proprietary blends, clear sourcing information
Prices checked 2026-03-31. Cost shown is per clinically effective daily dose, not per pill.
Digestive Enzymes Ultra
Pure EncapsulationsHypoallergenic formulation free of gluten, soy, dairy, and common allergens. A good choice for people with multiple food sensitivities who also need enzyme support.
Well-formulated broad-spectrum blend, but the evidence for OTC enzymes in general digestive support remains limited
Manufactured in a GMP facility with hypoallergenic formulation, but no third-party product-level testing verified
$0.88/day at 2 capsules per meal - one of the more expensive options
Full activity unit disclosure for all enzymes, no proprietary blends, hypoallergenic and free of common allergens
Prices checked 2026-03-31. Cost shown is per clinically effective daily dose, not per pill.
Multi Enzyme
Horbaach
Lists enzyme amounts only in milligrams with zero activity units disclosed. Without activity units, there is no way to determine if this product contains enough active enzyme to digest anything. The low price is meaningless if the product does not work.
Lists enzyme amounts only in milligrams with no activity units, making it impossible to assess clinical relevance
GMP certified facility but no third-party product testing verified
Cannot calculate cost per effective dose because enzyme potency is completely unknown
Proprietary blend listing enzymes only in milligrams with no activity units - this tells you nothing about whether the product works
Prices checked 2026-03-31. Cost shown is per clinically effective daily dose, not per pill.
Advanced Digestive Enzymes
Nature's Truth
Another proprietary blend product listing enzymes only in milligrams. Without activity units, there is no evidence this product has any meaningful digestive enzyme activity. Low price does not compensate for unknown potency.
Proprietary blend with no activity units makes clinical assessment impossible
GMP certified facility but no independent third-party product testing verified
Cannot calculate cost per effective dose because enzyme potency is completely unknown
Proprietary blend hiding individual enzyme amounts, no activity units listed anywhere on the label
Prices checked 2026-03-31. Cost shown is per clinically effective daily dose, not per pill.
Full Comparison
| Category | Fast Act Lactase Enzyme Supplement Lactaid | Super Enzymes NOW Foods | Digestive Enzymes Doctor's Best | Essential Enzymes 500mg Source Naturals | Digestive Enzymes Zenwise | Digest Gold with ATPro Enzymedica | Bio-Gest Thorne | Digestive Enzymes Ultra Pure Encapsulations | Multi Enzyme Horbaach | Advanced Digestive Enzymes Nature's Truth |
|---|---|---|---|---|---|---|---|---|---|---|
| Overall | B+ | B | B | B- | B- | B- | B- | B- | D- | D- |
| Evidence | B | C | C | C | C | C | C | C | F | F |
| Quality & Purity | C | C | C | C | C | C | C | C | C | C |
| Value | A | A | A | B | B | C | C | C | F | F |
| Transparency | A | A | A | A | B | A | A | A | F | F |
| Cost/Day | $0.23 | $0.15 | $0.16 | $0.20 | $0.30 | $0.61 | $0.73 | $0.88 | $0.00Winner | $0.00 |
| Dose/Serving | 1caplet | 1capsule | 1capsule | 1capsule | 1capsule | 1capsule | 2capsules | 2capsules | 2capsules | 2capsules |
| Form | Lactase enzyme (9,000 ALU) | Animal-derived pancreatin + Betaine HCl + Ox Bile | Fungal-derived vegan enzyme blend | Multi-source enzyme blend | Plant-derived enzyme blend + probiotic blend | Fungal-derived enzyme blend (Thera-blend) | Animal-derived pancreatin + Betaine HCl | Vegetarian enzyme blend | Proprietary enzyme blend (mg only, no activity units) | Proprietary enzyme blend (mg only, no activity units) |
| Third-Party Tested | No | ✓ Yes | No | No | No | ✓ Yes | ✓ Yes | No | No | No |
| Proprietary Blend | No | No | No | No | Yes | No | No | No | Yes | Yes |
Who Should Take Digestive Enzymes?
People diagnosed with exocrine pancreatic insufficiency (under medical supervision with prescription PERT). People with confirmed lactose intolerance who want to eat dairy without symptoms. Older adults experiencing age-related decline in digestive enzyme production. Individuals with consistent post-meal bloating or discomfort that has been evaluated by a physician.
Who Should Avoid It?
People with active stomach ulcers or gastritis, especially products containing protease or Betaine HCl. Anyone with allergies to Aspergillus mold (the source of most fungal-derived enzymes) or to pork/beef (the source of animal-derived pancreatin). Otherwise healthy people without digestive symptoms - there is no evidence that supplemental enzymes benefit normal digestion.
Side Effects & Safety
Generally well-tolerated at recommended doses. Mild nausea, abdominal cramping, and diarrhea are the most commonly reported side effects. Products containing Betaine HCl can cause significant gastric irritation, heartburn, or burning sensations, especially in people with existing gastritis or ulcers. High-dose protease supplements may thin the blood in rare cases. Allergic reactions are possible in individuals sensitive to fungal (Aspergillus) or animal-derived ingredients.
Frequently Asked Questions
Why are digestive enzymes measured in activity units instead of milligrams?
Milligrams measure the weight of the enzyme powder, but they tell you nothing about how much digestive work the enzyme can actually perform. Activity units (like DU for amylase, HUT for protease, FIP for lipase, and ALU for lactase) measure the enzyme's functional capacity - how much substrate it can break down under standardized conditions. A product listing '500mg enzyme blend' without activity units is essentially hiding whether the enzymes are potent or inert. Always look for activity units on the label.
Should I choose a broad-spectrum enzyme or a targeted one?
It depends on your specific issue. If you know you are lactose intolerant, a targeted lactase supplement like Lactaid is more effective and better supported by evidence than a broad-spectrum blend. If you have trouble digesting fats specifically, look for a product with high lipase activity. Broad-spectrum blends are reasonable for general post-meal discomfort, but the evidence supporting them for this use is weak. Targeted enzymes matched to a specific deficiency have much stronger clinical backing.
What is the difference between fungal-derived and animal-derived digestive enzymes?
Fungal-derived enzymes (typically from Aspergillus species) are active across a wider pH range, meaning they can work in both the acidic stomach and the more alkaline small intestine. Animal-derived enzymes (pancreatin from pork or beef) are most active at the higher pH of the small intestine and are the standard for treating diagnosed exocrine pancreatic insufficiency. Fungal enzymes are suitable for general use and are vegan-friendly. Animal-derived pancreatin is specifically indicated for EPI and is available by prescription at therapeutic doses.
Do I need digestive enzymes if I sometimes feel bloated after meals?
Probably not. Occasional bloating is extremely common and is more often caused by eating too quickly, high-FODMAP foods, inadequate fiber, or gut motility issues rather than enzyme deficiency. The evidence for digestive enzyme supplements in people without a diagnosed deficiency is weak. Before spending money on enzymes, try eating more slowly, identifying trigger foods, and consulting a gastroenterologist if symptoms persist.
Why do some products list enzyme amounts only in milligrams with no activity units?
Products that list only milligrams and omit activity units are using a proprietary blend or low-quality formulation where the actual enzyme potency is either unknown or too low to advertise. This is a major red flag. Without activity units, there is no way to determine whether the product contains enough active enzyme to have any digestive effect. We score these products with an F for transparency and do not recommend them.
Can I take digestive enzymes with probiotics?
Yes. Digestive enzymes and probiotics work through completely different mechanisms and do not interfere with each other. Enzymes break down food components in the stomach and upper small intestine, while probiotics colonize the lower GI tract. Some products combine both, though the evidence for these combination products specifically is limited. Taking them separately is fine and allows you to dose each appropriately.
Sources
- Somaraju UR, Solis-Moya A. Pancreatic enzyme replacement therapy for people with cystic fibrosis. Cochrane Database Syst Rev. 2020.
- Ramirez FC, et al. Effect of lactase preparations on lactose absorption in lactose maldigesters: a randomized double-blind crossover trial. Dig Dis Sci. 1994;39(7):1519-22.
- Deng Y, et al. Lactase supplements taken with food reduce lactose intolerance symptoms: a systematic review and meta-analysis. J Dairy Sci. 2015;98(11):7541-7.
- Quinten T, et al. Can the supplementation of a digestive enzyme complex offer a solution for common digestive problems? Arch Public Health. 2014;72(Suppl 1):P7.
- Ianiro G, et al. Digestive enzyme supplementation in gastrointestinal diseases. Curr Drug Metab. 2016;17(2):187-93.
- NIH Office of Dietary Supplements. Dietary Supplements for Primary Care Providers: Digestive Enzymes.
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. The products discussed on this page are not intended to diagnose, treat, cure, or prevent any disease. Always consult with a qualified healthcare professional before starting any supplement regimen.