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.

0

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


Fodmix (Quatrase 10,000)

Fodmix (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

Trusted Shops icon
4.56 – Excellent
View all reviews
04/05/2026
Excellent
Excellent
Verified review
02/05/2026
The enzymes are useless to me….
The enzymes are useless to me because they contain calcium carbonate. It disagrees with me. Forced to throw it all away.
Verified review
01/05/2026
Intoleran Quatrase has been a game…
Intoleran Quatrase has been a game changer! They’re a little pricey, but they work, so they’re worth it for that reason. I hope one day they’ll increase the amount of capsules!
Verified review
01/05/2026
It just arrived in the mail yesterday
It just arrived in the mail yesterday. I haven’t used it; I’m eager to; however, I sure wish it was more affordable, which is the reason Im waiting until I have a meal that I’m concerned about.
Verified review
30/04/2026
I was Still charged an international…
I was Still charged an international fee when the return address on my package said Kentucky. That doesn’t seem right.
Verified review
28/04/2026
It had no affect on me
It had no affect on me. It’s no silver bullet.
Verified review
27/04/2026
Starchaway helps alot with bread and…
Starchaway helps alot with bread and potatoes.
Verified review
26/04/2026
Order lost in mail.
My order was considered lost in the mail. It was said the zip code was incorrect, even though it is correct on my account. I have called and emailed the company to ask them to resend my order or contact me. I have not heard back yet.
Verified review
26/04/2026
Doctor recommend
They have highly doctor and nutritionist recommended enzyme supplements that are not 100% but its a lot closer than anyone else and the only real sucrase isomaltase on the market imo.
Verified review
24/04/2026
It woks and is so easy to use
It woks and is so easy to use
Verified review
22/04/2026
Product are good
Product are good. I use several. But the shipping is a little slow.
Verified review
21/04/2026
Carbostarch gave me access back to food!
I have a million dietary sensitivities and it had finally gotten so bad that I barely ate (lots of protein shakes) and didn’t like it when I did eat. I started using carbostarch and I’m extremely happy with how much access I’ve recovered to everyday foods like wheat and fruit and onion. Thank you so much to the scientists and everyone else at Intoleran!
Verified review
21/04/2026
Quick turn around time from date of…
Quick turn around time from date of order to delivery. Intoleran lactase drops allow me to enjoy fluid milk again at a price & convenience I can afford. Ordering directly from Intoleran US allows me to support a US based company without putting more $ into the pockets of fascist capitalistic pigs like Jeff Bezos.
Verified review
19/04/2026
The DAOmini is incredible
The DAOmini is incredible. Works so well; I’m still careful to eat low-histamine foods, but if I go to a friend’s house for dinner or to a restaurant, I can take one and know I’ll be fine. I also recommend it to other people with MCAS and HI. They don’t even know about Intoleran. I do think a stronger advertising campaign could improve potential customer awareness. I’ve never seen an ad for you on any platform. I found you organically 2 years ago, by searching the web.
Verified review
19/04/2026
Very fast delivery is appreciated.
Very fast delivery is appreciated.
Verified review
17/04/2026
Just started but already noticing…
Just started but already noticing improvement with GI inflammation.
Verified review
17/04/2026
I have not used it long enough
I have not used it long enough to give you a solid answer. So far it has decreased gas after alot of fruit.
Verified review
14/04/2026
So far I can’t tell if it works totally…
So far I can’t tell if it works totally for me. But I have ordered 2 more cans and will take more consistently to test it fully.
Verified review
14/04/2026
Gives comfortable support
One tablet only for milk products did not work for me. But, two tablets did the trick. I like a treat of French Vanilla ice cream and none of the lactose-free producers make it. This is cause for celebration! Is there a way to calculate how much Intoleran covers a two cup milk portion? I use goat milk for richness in my coffee. But going out to eat makes problems. By the way, the packaging is great and easy to keep handy.
Verified review
10/04/2026
Easy to order
Easy to order, received order promptly.
Verified review
08/04/2026
I take three capsules before eating
I take three capsules before eating, as directed, and doesn’t help at all with gas or diarrhea.
Verified review
08/04/2026
Still have gas when using it and eating…
Still have gas when using it and eating things
Verified review
08/04/2026
I have really felt the affect of the…lactose
I have really felt the affect of the starch way but the lactose worked really well. I was told that I should take three tablets instead of two and see if that helps with the starch pills I will try the next round and see if I see a difference.
Verified review
06/04/2026
I had some trouble with the delivery at…
I had some trouble with the delivery at first, but it got handled. Hopefully, we’ll not have any trouble again.
Verified review
05/04/2026
Shipping was fast but I am finishing…
Shipping was fast but I am finishing supplements that I have on hand so I haven’t tried the Intoleran product. yet.
Verified review
04/04/2026
It was effective!
It was effective!
Verified review
04/04/2026
This product has changed my life
This product has changed my life. I can eat food with my family and when I travel without any negative effects
Verified review
30/03/2026
I can’t function without it!
I can’t function without it! Truly a most supportive tool. Just wish my product was consistently in stock!
Verified review
30/03/2026
I’m extremely happy with your product.
I’m extremely happy with your product.
Verified review
29/03/2026
Can’t always afford to subscribe for…
Can’t always afford to subscribe for the discount. Some months we are tight so we have to wait until we can afford more. Wish it wasn’t so very expensive.
Verified review
29/03/2026
Taking it once daily.
Taking it once daily.
Verified review
28/03/2026
Beginnings
Just starting the product but seems to work. Fast delivery.
Verified review
26/03/2026
“Fructase” is not widely available in…
“Fructase” is not widely available in the US and it’s expensive for how many you need to take to eat one serving of fructose. I have found other digestive supplements but they use corn and I have a corn allergy. I’d still love to see the cost go down, but it’s a super great product especially if you only have to take one or two caps. I’ve already recommended the brand to other friends.
Verified review
25/03/2026
Great product
Great product. I haven’t had any issues on it. It’s a little pricey though
Verified review
25/03/2026
I just started the product but I was…
I just started the product but I was very happy with the ordering process and quick shipping! It came earlier than expected.
Verified review
19/03/2026
I recently determined I’d become…
I recently determined I’d become lactose intolerant and was getting ready for a trip, and was unsure if lactose free products would be available. You helped me with a very speedy delivery! …. And it’s WORKING 😉 thank you
Verified review
17/03/2026
Works fairly well on starch
Works fairly well on starch….not as well sugar…at least not for me.
Verified review
16/03/2026
this has helped my son feel normal…
this has helped my son feel normal again and not living in constant screaming pain!
Verified review
16/03/2026
Your test kits were extremely helpful…
Your test kits were extremely helpful while trying to resolve my sucrose intolerance.
Verified review
13/03/2026
I have IBS so now I’m able to eat my…
I have IBS so now I’m able to eat my favorite foods in moderation
Verified review
12/03/2026
No proper seal of product.
The box was ripped, and it looks like someone may have opened it. There was no seal on the bottle lid, which made me concerned about the safety of the product. I emailed the company but no solution yet.
Verified review
08/03/2026
My gut is definitely able to process…
My gut is definitely able to process certain FODMAPs much better when I take the Intoleran supplement when eating them. I wish I knew about this sooner!
Verified review
02/03/2026
received in record time
received in record time
Verified review
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

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

Ask a question

*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.

The product has been added to your cart View cart →