Science behind Koji Digestive Enzymes
Take before you eat β not after you regret it.
The Science Behind Koji Digestive Enzymes
Digestion is the gateway to nutrition
You don't actually get nourished by what you eat. You get nourished by what you digest.
Modern meals are more complex than the digestive system they're landing in. Processed ingredients, dense proteins, refined oils, engineered foods β all of it asks more of your enzymes than nature ever planned for. Koji Digestive Enzymes help your body break food into the small, usable pieces it actually needs. Meals feel lighter. Digestion runs smoother. Your body gets more out of the food you're already eating.
of functional enzymes per capsule.
the total enzyme content of typical mass-market blends.
Most enzyme supplements are designed to sound powerful. Ours is dosed to actually perform.
Walk down the enzyme aisle and most labels look impressive: "18 enzymes!" "22-enzyme complex!" Flip them over. The total enzyme content is often around 85 mg, spread across a dozen or more ingredients in trace amounts. That's enough to list on a label. It's not always enough to do the work of digesting a real meal.
Here's the difference:
| Typical Mass-Market Blend | Let Loose Koji Digestive Enzymes |
|---|---|
| ~85 mg total blend | 355 mg per capsule |
| Dozens of enzymes listed, each in trace amounts | 16 enzymes dosed at activity levels sized for real meals |
| Often listed by weight only | Disclosed in enzyme activity units (HUT, DU, FIP, etc.) |
| Commodity sourcing across multiple suppliers | Traditional Japanese Koji fermentation, 150+ year process |
Why activity units matter:
An enzyme's weight tells you how much material is in the capsule, but that includes inactive components too. Activity units tell you how much digestive work it can actually perform. They're not the same thing. HUT (proteaseβ breaks down protein), DU and SU (amylase- break down carbohydrates and starches), FIP (lipase- breaks down fat), GALU (lactase- breaks down lactose and dairy sugars), and ALU (alpha-galactosidase- helps break down beans and complex carbs). These are the standard units used to measure real enzyme function. We list every single one on our label.
What happens when you take a Let Loose capsule before a meal
You take it with water a few minutes before eating. The capsule dissolves in your stomach, releasing the Koji enzyme blend into the digestive tract right as food arrives. Each enzyme works on a specific part of the meal.
The three things that happen:
1. Protein gets a head start in the stomach.
Most animal-derived digestive enzymes don't survive stomach acid β they need enteric coating to work. Koji-derived enzymes are different: fungal proteases are naturally acid-stable and remain active under gastric conditions.1 Our formula includes acid-stable proteases that start breaking protein apart before it ever reaches the small intestine, loosening the structure so later enzymes can finish the job.2
2. The full meal gets covered.
Sixteen enzymes work in parallel β proteases on the steak, amylases on the bread, lipases on the oil, lactase on the cheese, cellulases on the vegetables, alpha-galactosidase on the beans. Whatever's on your plate, something in the capsule is working on it.
3. The good stuff becomes available.
Better breakdown means the nutrients locked inside plant cell walls, protein matrices, and fat droplets are released where your gut can actually absorb them. That's the whole point: you don't benefit from what you eat β you benefit from what you digest and absorb.
What's in each capsule:
See full enzyme breakdown
| Enzyme | Activity per capsule | What it breaks down |
|---|---|---|
| Protease I | 20,000 HUT | Proteins β meats, dairy, legumes |
| Protease II | 50,000 HUT | Proteins β broad pH range |
| Protease (Acid-Stable) | 200 SAPU | Starts protein breakdown in the stomach |
| Peptidase DPP-IV | 72 DPPIV | Peptides and gluten-derived fragments |
| Peptidase | 4,000 HUT | Shorter protein chains |
| Alpha Amylase | 12,000 DU | Starches β bread, rice, potato |
| Alpha Galactosidase | 300 GALU | Complex sugars in beans, cruciferous veg |
| Beta Glucanase | 50 BGU | Beta-glucans in oats, barley |
| Invertase | 400 SU | Sucrose |
| Lactase | 400 ALU | Lactose (dairy sugar) |
| Pectinase | 14 ENDO PG | Pectin in fruits and vegetables |
| Cellulase | 2,000 CU | Cellulose β plant cell walls |
| Hemicellulase | 2,000 HCU | Hemicellulose β plant fiber |
| Xylanase | 300 XU | Xylan β grain fiber |
| Lipase I | 100 FIP | Fats β short/medium-chain |
| Lipase II | 1,300 FIP | Fats β broad-chain |
Activity units: HUT = protein-breaking units. DU = starch-breaking units. FIP = fat-breaking units. GALU, SU, ALU, BGU, CU, HCU, XU, ENDO PG, DPPIV, SAPU = specialist units for specific substrates. Industry standard measurements.
What one capsule is sized for (theoretical)
Based on the activity levels above, one capsule is formulated to support digestion of roughly 40β60 g of protein, 40β80 g of carbohydrate, and 20β25 g of fat β about the size of a steak dinner with a baked potato. These estimates are biochemical modeling, not clinical claims; actual digestion varies by person.
Why we make this with a 1,100-year-old fermentation method
Most enzyme supplements on the market are made by isolating one or two enzymes from fungal or bacterial fermentation, then heavily processing and purifying them into a powder before blending them together. It's efficient. It's cheap. But it's also a narrow, reductionist approach to a very complex problemβbecause real food isn't made of isolated molecules, it's made of complex structures.
Koji (Aspergillus oryzae) is different. It's been cultivated in Japan for over a millennium β originally for miso, soy sauce, and sake β and was domesticated specifically for its enzyme production. A single Koji culture naturally secretes dozens of hydrolytic enzymes in parallel, including 65 endopeptidase and 69 exopeptidase genes' worth of protein-cutting machinery.3 It's the only fungus in the world with a dedicated status as a national fungus of Japan.
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Koji is built for broad-spectrum digestion.
A single Koji fermentation produces a natural ecosystem of enzymes β proteases, amylases, lipases, cellulases, hemicellulases, xylanases, pectinases, peptidases, esterases β all at once. Because they evolved together, they function together. This is closer to how digestion actually works in the gut (coordinated, overlapping, redundant) than isolated single-enzyme blends can match.4
Plain English: Koji gives you a whole team, not a lineup of solo players.
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Koji enzymes survive stomach acid.
In in-vitro models of human digestion, fungal enzymes remain active under gastric conditions β the high acidity that destroys animal-derived pancreatic enzymes (which is why pancreatic supplements require enteric coating).1 Our acid-stable proteases start breaking down protein in the stomach phase, before food even reaches the small intestine.
Plain English: they start working the moment you swallow.
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Koji has 150+ years of modern medical use.
Koji-derived enzymes aren't new. In 1894, Japanese chemist Jokichi Takamine patented Taka-diastase β a Koji-derived digestive enzyme preparation β and it became one of the first enzyme supplements ever commercialized for stomach upset and overeating.5 Today, A. oryzae is GRAS-designated by the FDA for specified enzyme preparations.5
Plain English: this isn't a trend ingredient. Koji has been helping people digest meals since before the invention of the automobile.
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Koji produces secondary enzymes that isolated blends miss.
Traditional Koji fermentation naturally generates a long tail of secondary enzymes beyond the headline list β cellulases, hemicellulases, xylanases, pectinases, esterases, and additional peptidases. These secondary enzymes specialize in breaking apart the complex structures that trap nutrients: plant cell walls, protein matrices, connective tissues, cellular membranes.
Plain English: before the main enzymes can do their job, something has to open the food up. Koji does both.
The takeaway: Koji fermentation is the reason this formula performs like an integrated digestive system instead of a list of isolated enzymes on a label.
What the research says about digestive enzyme supplementation
The category has become well-studied over the last decade. Here's what peer-reviewed human trials have shown.
Multi-enzyme supplementation reduces post-meal bloating.
A 2024 randomized, double-blind, placebo-controlled crossover study of 25 adults with daily post-meal bloating found that a single dose of a multi-digestive-enzyme supplement reduced abdominal distension by 58% at 30 minutes and 68% at 90 minutes compared to placebo. Eighty percent of participants saw a measurable reduction in distension with the enzyme product.6
Enzyme supplements improve digestive comfort over time.
A 2023 randomized, double-blind, placebo-controlled trial of 120 adults with digestive symptoms used a multi-enzyme supplement twice daily for two months. The enzyme group reported improvements in overall quality of life, sleep quality, and a decrease in the severity of post-meal discomfort β with no side effects reported.7 A separate RCT in functional digestive complaints likewise showed statistically significant improvements in bloating, fullness, and post-meal distress versus placebo.8
The underlying mechanism is now well-characterized.
A 2022 study using the INFOGEST in-vitro model of human digestion demonstrated that fungal-derived digestive enzymes meaningfully improve macronutrient hydrolysis β particularly for protein, starch, and fat β under simulated gastric and small intestinal conditions.1 In other words, the mechanism isn't speculative. You can watch it happen in the lab.
Our formula is built on the same class of enzymes these studies used β Koji-fermented, broad-spectrum, dosed by activity unit β at 355 mg per capsule.
One capsule before your two biggest meals. That's the whole ritual.
Take one Let Loose Koji Digestive Enzymes capsule before your two largest meals of the day. For heavier meals, take two. Small habit, meaningful support. And because Koji enzymes are naturally acid-stable, you don't have to time it perfectly β they start working as soon as the capsule dissolves.
Eat what you want. Just digest it better.
These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. If you are pregnant, nursing, taking medication, or have a medical condition, consult your healthcare provider before use. Discontinue if adverse reactions occur.
References
- Morell P, et al. (2022). Fungal digestive enzymes promote macronutrient hydrolysis in the INFOGEST static in vitro simulation of digestion. Food Chemistry.
- Enzyme Technical Association. Orally Administered Enzyme Food Supplement Safety Overview.
- Yang L, et al. (2022). Phenotypic, Genomic, and Transcriptomic Comparison of Industrial Aspergillus oryzae: Analysis of Key Proteolytic Enzymes Produced by Koji Molds. Microbiology Spectrum.
- Daba GM, et al. (2021). The ancient koji mold (Aspergillus oryzae) as a modern biotechnological tool. Bioresources and Bioprocessing.
- Hiroi M, Nagao S. (2021). Medical Application of Substances Derived from Non-Pathogenic Fungi Aspergillus oryzae and A. luchuensis-Containing Koji. Journal of Fungi (PMC).
- Spagnuolo R, et al. (2024). A Multi-Digestive Enzyme and Herbal Dietary Supplement Reduces Bloating in a Single Use in Healthy Adults: A Randomized, Placebo-Controlled, Cross Over Study. Nutrition and Dietary Supplements.
- Graziani C, et al. (2023). Efficacy of digestive enzyme supplementation in functional dyspepsia: A monocentric, randomized, double-blind, placebo-controlled, clinical trial. Biomedicine & Pharmacotherapy.
- Majeed M, et al. (2018). Evaluation of the Safety and Efficacy of a Multienzyme Complex in Patients with Functional Dyspepsia: A Randomized, Double-Blind, Placebo-Controlled Study. Journal of Medicinal Food.