specialist in digestive health since 2008

specialist in digestive health since 2008

Since 2008, we’ve dedicated ourselves to crafting nutritional supplements. Our team of dieticians meticulously develops our products with exceptional care. We prioritize purity, using only essential ingredients in our formulations. This guarantees our supplements are gluten-free, soy-free, and of superior quality, ensuring safety and minimizing unwanted side effects.

Monash University low FODMAP certified™

Monash University low FODMAP certified™

Select products have been proudly Monash University Low FODMAP Certified™

more than 100,000 satisfied customers

more than 100,000 satisfied customers

Since 2008, our mission has been to “help everyone enjoy their food again.” We are proud to have supported over 100,000 customers.

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Don’t let bloating and gas ruin your daily life!

Feeling bloated, constipated or dealing with embarrassing gas are more than just physical discomforts—they can disrupt your entire day, leaving you feeling uneasy and self-conscious. Fortunately, there is support, Intoleran’s specially formulated vegan, dairy, gluten, and soy free supplements are designed to quickly help reduce occasional gas, bloating & indigestion*. Helping you feel comfortable, confident, and ready to take on your day without digestive distractions


Quatrase 10.000

Quatrase 10.000

Testpack 6 Capsules
  • Special enzyme formula designed for multiple food intolerance
  • Reduces occasional gas, bloating & indigestion*
  • FODMAPs are primarily found in dairy, fruit, vegetables, wheat, soy and legumes
  • Reduce digestive issues without a restrictive diet!*
Starchway

Starchway

Testpack 6 Capsules
  • Helps to reduce gas and bloating associated with sugar AND starchy foods*
  • Starch and sucrose are primarily found in grains, potatoes, fruit and processed foods like cookies and sauces
  • Easy to take capsule – no need to dissolve in water!
  • Fast-acting enzyme formula
Lactase 20,000

Lactase 20,000

Testpack 6 Scored Tablets
  • Helps reduce gas and bloating associated with digesting dairy*
  • Highest dosed Lactase tablet for lactose intolerance
  • Lactose (milk sugar) is primarily found in milk, cheese and other dairy products
  • Low FODMAP-certified, vegan, dairy, gluten and soy free

Intolerance Test

Not sure what’s causing your gassy stomach and bloated feeling?

Select the foods you think you may be sensitive to
Personal intolerance profile. We’ll demonstrate how the selected foods categorize into different food groups and the potential intolerances they may be linked to 
Digestive enzymes. We provide extra information about digestion and the role of digestive enzymes
Personal advice. Based on your selection of foods, we give you concrete advice and tips on how to deal with your potential food intolerances. You can also easily download your personal advice to take with you to your dietitian or doctor. Additionally, you can always consult with our own Intoleran dietitians.


Trusted by more that 100.000 happy customers and professional dietitians worldwide

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4.58 – Excellent
View all reviews
28/02/2026
The Starchway pills do help digest…
The Starchway pills do help digest sucrose, but it can take 2-4 of them and sometimes my stomach hurts after. Overall, I’m glad to have the product handy for social occasions when it’s hard to get away from the sugar.
Verified review
27/02/2026
Seems like it just delayed the stomach…
Seems like it just delayed the stomach pains and diarrhea.
Verified review
27/02/2026
It seems to work well for me but it…
It seems to work well for me but it needs to be more affordable.
Verified review
26/02/2026
Starchway Works
Starchway has been a huge help to my digestion.
Verified review
26/02/2026
I love the lactase drops
I love the lactase drops! they let me treat my own milk, so I’m back to buying my milk from the local dairy instead of some big corporation. Trying the news capsule for fodmaps and very excited and hoping for good results!
Verified review
25/02/2026
Product is a game changer for me
Product is a game changer for me. I’m enjoying the faster delivery process as well.
Verified review
25/02/2026
I like that we can get shipmentments…
I like that we can get shipmentments faster. I would like to be able to have subscription process easier.
Verified review
22/02/2026
So far everything has been great
So far everything has been great. No irrigation to my stomach so far I feel great.
Verified review
21/02/2026
Sometimes the product is excellent and…
Sometimes the product is excellent and sometimes it doesn’t work at all. Are there quality control issues where some batches are not effective?
Verified review
18/02/2026
I felt nauseous the next day
I felt nauseous the next day. I’ve only used it once. I’ll try one more time to be sure that it wasn’t something else. It did help with the congestion and other symptoms I get from histamines.
Verified review
17/02/2026
The product was very good and…
The product was very good and effective. However, for the second time I had a delivery problem. One of your carriers (OnTrack) contacted me on two different orders that they could not deliver due to incomplete address. I tried to contact them but was unable to do so. In any event, on both occasions, the packages were delivered about a week late with no further address information from me. Further, upon receipt of both orders I noticed that the delivery address indicated on the packages was perfect. Suggest you review these situations with OnTrac.
Verified review
17/02/2026
Good customer service
Good customer service. I would like lower prices!
Verified review
17/02/2026
DAO Mini is not strong enough
DAO Mini is not strong enough. I need to take a lot of them for it to work.
Verified review
13/02/2026
Life changing!
Life changing!
Verified review
12/02/2026
Great product
Great product, works well! Wish it was a little cheaper as I have to use it for medical reasons with most meals, so it gets expensive fast! But it’s super helpful!
Verified review
11/02/2026
Just simply too expensive
Just simply too expensive
Verified review
11/02/2026
Easy to order.
Easy to order.
Verified review
09/02/2026
I can have fruit again!
just had my first apple in over 15 years no symptoms!
Verified review
06/02/2026
I am so pleased with Itoleran and the…
I am so pleased with Itoleran and the people that supply it!! It works perfectly for me. I have ordered the Lactose formula but the regular works so well-I will probably use one or the other at times. I am so pleased to be able to have it sent so promptly! Thank you for how well you run your company. I am so grateful. Ann Sand
Verified review
06/02/2026
Bad customer service and ordering…
Bad customer service and ordering ability
Verified review
05/02/2026
It helps me handle my stomach
It helps me handle my stomach issues
Verified review
04/02/2026
i added 20 drops into one gallon milk
i added 20 drops into one gallon milk, waited for over 48 hours, i still have stomach gas as usual
Verified review
30/01/2026
So far it works well
So far it works well
Verified review
29/01/2026
Good service
Good service, good products.
Verified review
23/01/2026
Havent taken it long but felt better…
Havent taken it long but felt better after first dose. Im hopeful.
Verified review
22/01/2026
Seems to be working good for me in…
Seems to be working good for me in addition to Sugraid. I just wish my insurance would pay for it as it is so expensive.
Verified review
20/01/2026
My gastroenterologist recommended…
My gastroenterologist recommended Starchway. It has helped a great deal!
Verified review
19/01/2026
The Intoleran is helping me with my…
The Intoleran is helping me with my issues with lactose intolerance. I’m still a little afraid to eat or drink dairy products, but so far, so good. I’ve talked to several of my friends about Intoleran. One of my friends has tried it and says that it works well for her. So, I order for her too😊
Verified review
19/01/2026
Works Great & Love the Dispenser
I have histamine intolerance and use the Intoleran Mini version of DAO when I stray from my usual strict low-histamine diet. It works better than other types and brands I’ve tried. No side effects. Works quick (I usually take it just 5 minutes before eating). On top of that, I LOVE the dispenser it comes in.
Verified review
18/01/2026
Once in the morning is good
Once in the morning is good, might still need lactose pill for evening meal.
Verified review
18/01/2026
Wonderful Product
It allows me to eat a wide variety of foods without side effects. It deals with the Fructose and Fructans that don’t like me.
Verified review
17/01/2026
I was so pleased to get my order in 2…
I was so pleased to get my order in 2 days! I have been using the regular Intoleran with good results. I have a little over a month of that left and will go with Intoleran Lactose after that. Thank you so much for a product that works and is available!!
Verified review
15/01/2026
I’m able to eat starchy foods without…
I’m able to eat starchy foods without bloating or causing an onset if SIBO. Yay!!!
Verified review
14/01/2026
works!
works!
Verified review
14/01/2026
Had an allergic reaction
Had an allergic reaction, likely alpha gal present in capsules.
Verified review
13/01/2026
I have a life again!
I have a life again and able to tolerate foods.
Verified review
12/01/2026
Doesn’t consistently relieve the GI…
Doesn’t consistently relieve the GI distress even though i control my portions and avoid high fructose items. More scientific studies should be considered because its difficult to function in social eating.
Verified review
12/01/2026
I have had some odd IBS-D for almost a…
I have had some odd IBS-D for almost a year. Nothing made a difference – until intoleran.
Verified review
09/01/2026
Super fast delivery and Starchaway…
Super fast delivery and Starchaway works for me!
Verified review
09/01/2026
How do people not know about this!
How do people not know about this! I have celiacs and can’t drink milk of have dairy and I have been spending way too much money on “dairy free” items. I tried this the other day on normal half & half we had in the fridge. I gave it 48 hours to do it’s thing and haven’t had an issue at all. Man it’s a game changer and is going to open up so many options for me now.
Verified review
08/01/2026
It has helped with my IBS symtpms a…
It has helped with my IBS symptoms a ton! It is preventing a lot of bloating and pain. I’m so happy I found it!
Verified review
04/01/2026
Love the fast shipping!
Love the fast shipping!! Ordered Thursday before midnight. Received on Saturday. Perfect!
Verified review
02/01/2026
Quatrase has helped me so much with…
Quatrase has helped me so much with being able to,add variety to my diet without suffering bad consequences. It’s like a miracle for me!
Verified review
01/01/2026
Intoleran’s products have been a…
Intoleran’s products have been a lifesaver for me. The enzymes are high quality and work well.
Verified review
01/01/2026
Helpful product, but expensive
I eat a plant predominant diet even though I struggle to digest FODMAPs in many foods. I’ve found the quatrase 10,000 to be helpful in allowing me to eat a variety of foods more comfortably. However, the product is too expensive for me to afford taking them with every meal (even buying the bulk bottle). There are people with more limited income than I have who would benefit, but simply can’t afford the products.
Verified review
30/12/2025
Notice to difference in one week
Notice to difference in one week. No more issues eating the foods I love.
Verified review
29/12/2025
The product is great
The product is great. My grandchildren take the lactose pills and they are very effective. Ordering is easy. Any questions I have had have been answered promptly and completely.
Verified review
29/12/2025
You sent me the wrong product that I…
You sent me the wrong product that I paid for. Why bother paying money and wasting time for a product that I didnt order? I ordered Starches and sucrose and received ONCE a DAY for DAIRY..
Verified review
29/12/2025
waiting until after the holidays to try…
waiting until after the holidays to try intoleran
Verified review
29/12/2025
It takes too long for the order to get…
It takes too long for the order to get mailed. The product is good.
Verified review

Intoleran Quatrase Forte

Extreme bloating after eating or does you gassy stomach controls your daily life?

If you are not sure which foods cause your symptoms, or if you are looking for a digestive enzyme that helps with multiple food intolerances, Quatrase Forte is your best choice. Quatrase Forte is a fast acting enzyme formula designed to support the digestion of the most common gut symptom triggers like FODMAPs. FODMAPs are found in foods such as milk and dairy products, fruits like cherries and apples, honey, vegetables such as onions and garlic, wheat, soy (products), legumes, and processed foods such as sauces, breakfast cereals, and candy. Quatrase Forte helps to reduce occasional gas, bloating and discomfort associated with FODMAP intolerance.* Take back control on your daily life and don’t let excessive gas and bloating makes you feel uncomfortable any longer!

Multiple food intolerance formula

Helps support digestive issues without a restrictive diet*

Helps reduce occasional gas, bloating & indigestion*

Unique enzyme mix of body own enzymes, specially designed for FODMAP issues

Vegan, dairy, gluten and soy free

Easy to take capsule. No need to desolve in water

Affordable and available over the counter


Why Intoleran

Free 1-on-1 Advice

Our team of expert dietitians is always here to provide you with practical advice and detailed information about our products. Schedule an appointment to get free dietary advice!

No effect, money back!

Risk-free trial period with our unique 100-day satisfaction guarantee. The 100-day satisfaction guarantee ensures you can test our products without any worry.

Intolerance test

By learning which foods irritate your gut, you can take more targeted action. Use the Intolerance test to get an indication on which foods pose a risk for you


Discover our full range for Intestinal health

decrease bloating

Free advice from our dietitians

Digestive complaints? Let us help you, like we’ve helped many others. We will help you to find the solution that fits your needs best.

Fill in our contact form and we will get back to you

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*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.

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