Diastase.
A starch-digesting enzyme from yeast that helps break down carbohydrates in your gut. Breaks down starches (amylose and amylopectin) into maltose and dextrins for easier absorption. Pre-digests carbohydrates before they reach your small intestine.
Reviewed March 2026
- Category
- Enzyme
- Also filed under
- Breaks down starches and complex carbohydratesSupports carbohydrate digestionMay reduce bloating from starchy meals
What Diastase is, and what it does.
- Does it work
- Legitimate digestive enzyme with a clear function. Most helpful for people with starch digestion issues. Healthy people generally don't need it.
- How much to take
- 50-100 mg, but activity is better measured in DU (diastatic units). Take with starchy meals.
- Time to feel it
- It works during the meal you take it with, so any change in after-meal comfort turns up inside an hour or two rather than building across weeks.
- The first dose
- If you have starch digestion issues, you may notice less bloating after your first starchy meal.
- With regular use
- Weeks of use is the same meal-by-meal effect repeated rather than a build-up. Nothing accumulates, so it keeps working while you keep taking it with starchy food.
- How well tolerated
- Well tolerated. Avoid if allergic to yeast.
- How it feels
- Less bloating and gas after starchy meals, if you needed the enzyme support in the first place.
- The overlooked benefit
- It's sold in activity units, not milligrams, because diastase names a job rather than one protein. Two powders of the same weight can carry different activity.
50 to 100mg a day is where Diastase works.
Source: Roxas, 2008; digestive enzyme literature
The proof, claim by claim.
These words describe the research, not the molecule's worth. Research strength is how much work stands behind one claim, and it is never a product score.
- Breaks down dietary starches
- Helps with bloating from carbs
- Needed by healthy people
Questions people ask about Diastase.
- Do I need this if I'm healthy?
- Probably not. Your body produces amylase in saliva and from the pancreas. Supplemental enzymes mainly help people with diagnosed enzyme insufficiency or specific digestive conditions.
- Is this the same as amylase?
- Yes, essentially. Diastase is an older term for a group of amylase enzymes that break down starch. Modern labeling often uses 'amylase' instead.
- Should I take this alone or in a blend?
- In a blend. A comprehensive digestive enzyme supplement with amylase, protease, lipase, and other enzymes provides broader digestive support than any single enzyme.
- Does this help with gluten digestion?
- No. Diastase breaks down starch, not gluten. Gluten is a protein. For gluten, you'd need specific proteases (like DPP-IV). And even those don't make it well tolerated in celiac patients.
Why these belong in the same formula. Each row says what the basis is, from settled biochemistry through to a trial that measured the pair.
Diastase was the nineteenth-century term for the starch-splitting activity now resolved into alpha-amylase, beta-amylase and glucoamylase. A product declaring both diastase and amylase is declaring overlapping activity rather than two separate tools. Total activity is what matters, and it is measured in units rather than milligrams.
Pancreatin is a mixed extract carrying amylase, protease and lipase from pancreatic tissue. Its amylase works at the near-neutral pH of the small intestine, while microbial diastase preparations retain activity at lower pH. Taken together they cover a wider pH span of the meal transit than either does alone.
Mixed enzyme products pair amylolytic, proteolytic and lipolytic activity because a normal meal contains all three macronutrient classes. Diastase covers only the starch fraction. The pairing is formulation convention and reflects meal composition rather than any interaction between the enzymes themselves.
Lipase hydrolyses ester bonds in triglycerides while amylolytic enzymes hydrolyse glycosidic bonds in starch. The two cannot compete because their substrates and their chemistries differ. Combining them broadens macronutrient coverage in a single capsule.
Lactase cleaves the beta-1,4 bond in lactose, a linkage amylases cannot touch. Amylase cleaves alpha-1,4 bonds in starch, which lactase cannot touch. Blends carry both because the two carbohydrate complaints people report come from different sugars.
Pepsin needs a strongly acidic pH and is a protease, so it can hydrolyse other proteins including enzymes. Amylases are themselves proteins and lose activity under gastric acid and pepsin exposure. A blend carrying both is relying on transit and on the enzymes' relative acid stability, which differs between fungal, bacterial and cereal sources.
Betaine hydrochloride lowers gastric pH, which suits pepsin and acid-stable fungal amylases but shortens the working life of cereal or pancreatic amylase. The source of the amylolytic activity therefore decides whether the pairing helps or hinders. Read the interaction as source-specific rather than uniform across all starch enzymes.
Alpha-amylases hold one or more tightly bound calcium ions that stabilise the tertiary fold near the active site. Removing that calcium with a chelator unfolds and inactivates the enzyme. This is a structural requirement of the enzyme in the vial rather than a reason to dose calcium with a meal.
Resistant starch resists amylolytic digestion because of its crystalline packing, retrogradation or chemical modification, which is exactly why it reaches the colon and feeds fermentation. Adding an amylolytic enzyme can degrade part of some resistant starch types, converting fermentable substrate into absorbable glucose upstream. The two work against each other by design.
Green tea catechins bind alpha-amylase and inhibit its activity in laboratory assays. Taken in the same capsule or the same meal they work against added amylolytic activity. The inhibition is well characterised in vitro. How much of it survives in a real meal is less clear.
1-Deoxynojirimycin is a sugar-mimicking inhibitor of intestinal alpha-glucosidases, the enzymes that finish the job amylase starts. Pairing it with an added starch-splitting enzyme sets two ingredients against each other on the same digestive sequence. Anyone taking both is paying for opposing actions.
Phytase releases phosphate from phytic acid and in doing so frees minerals that phytate had bound. It is often produced by the same fungal fermentation platforms used for microbial amylases and appears alongside them in blends. The two act on different substrates and the pairing is a manufacturing and formulation convention.
Bromelain is a cysteine protease acting on peptide bonds, a chemistry unrelated to glycosidic bond hydrolysis. Blends include both to cover protein and starch in the same meal. A caveat worth stating: proteases in a blend can degrade the other enzymes over shelf life if the formulation does not separate or stabilise them.
Talk to a doctor before taking Diastase if any of these apply to you: Most healthy people don't need supplemental amylase, Not for people with yeast allergies. These are flags to check first, not effects Diastase is known to cause.
Not medical advice. Show the label to your pharmacist.What Diastase actually does.
Diastase is the old name for starch-cutting enzyme activity, covering alpha-amylase, beta-amylase and glucoamylase. It describes an activity, not one defined protein, so you'll see it listed in activity units rather than milligrams.
Alpha-amylase works from the inside out, snipping internal alpha-1,4 glycosidic bonds in amylose and amylopectin and leaving maltose, maltotriose and branched alpha-limit dextrins behind.
Alpha-amylase can't touch the alpha-1,6 branch points in amylopectin, so finishing starch off into glucose needs the gut wall enzymes maltase-glucoamylase and sucrase-isomaltase to take over afterwards.
People with normal salivary and pancreatic function already make alpha-amylase, starting in the mouth and carrying on in the small intestine, and pancreatic output sits in big excess compared with a typical starch load.
Where Diastase comes from.
Microbes are grown in a tank on a starchy feed under conditions that make them produce starch-splitting enzymes. The microbes are filtered out, the enzyme is concentrated, and it is mixed with a neutral powder so that every scoop has the same strength. Gentle drying matters here, because heat destroys the enzyme.
Built by fermentation, the same way vitamin B12 and many amino acids are made at scale. Controlled conditions, consistent output.
A starch or sugar-based medium with nitrogen and mineral salts is inoculated with a food-grade production organism. For the yeast route this is Saccharomyces cerevisiae, and for most commercial amylase it is a filamentous fungus or a Bacillus.
Fermentation conditions, in particular the carbon source and its feed rate, are set to induce amylase expression rather than simple biomass growth.
Cells are removed by centrifugation or filtration, and the enzyme is recovered from the cell-free supernatant or, for an intracellular enzyme, released by cell disruption first.
Ultrafiltration concentrates the enzyme and removes small molecules, with further chromatographic or precipitation steps used where a higher purity specification applies.
Activity is measured against a defined starch substrate under stated pH and temperature, then diluted onto a carrier such as maltodextrin to a declared units-per-gram figure. The carrier is what makes a consistent label claim possible.
The standardised material is dried gently, since heat destroys activity, and packed with moisture control because water accelerates activity loss on the shelf.
Getting Diastase from food.
The whole-food sources on file. A supplement closes the gap, it does not replace dinner.
A gram-for-gram figure (how much of each you would eat to match a dose) will appear here once it is sourced and reviewed. This page will not print a number it cannot cite.
The forms it comes in.
The essence, in one line each.
- Diastase activity was measured as one of the enzymatic quality indices characterising honeydew honey samples enriched with bee bread.In vitro study. Sęk et al., 2025 (Molecules). PMID 39860126 ↗
- Diastase appears in this report only as the laboratory digestion step used to confirm glycogen in stained tissue, not as anything given to the patients.Case report. Shah et al., 2026 (Clinical Case Reports). PMID 41567525 ↗
These are the studies our verdict leans on, chosen from the 2 we read for Diastase. The full linked list is below.
Problems people have reported.
Read this carefully. These are 494 voluntary, unverified reactions reported to the FDA (openFDA). The number mostly reflects how popular Diastase is, not how risky it is. A report is not proof Diastase caused anything. It is a signal of what to watch for, nothing more.
Source: openFDA adverse-event reports. Voluntary reporting, not an incidence rate.
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. This information is for educational purposes only and is not intended to diagnose, treat, cure, or prevent any disease. Consult your healthcare provider before starting any supplement regimen.
