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What is a food intolerance?
A food intolerance is a sensitivity to certain components in food – like lactose, fructose or hisatmine. Unlike food allergies, which involve the immune system, intolerances typically cause digestive symptoms such as bloating, stomach pain or diarrhea. While not dangerous, they can have a big impact on your daily comfort and well-being.
Why our intolerance test is worth taking
Our test gives you quick insight into possible food intolerances that may be causing your symptoms.
No complicated steps or long waiting times but just a simple, reliable analysis you can do from the comfort of your home.
- Instant insight into your food intolerance
- Free and without any obligation
- Your first step to enjoying food again
We’ve helped over 100,000 people understand their symptoms
Real results, real people. Join the thousands who’ve already taken our test, gained valuable insights into their food intolerances and enjoyed food again.
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
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
How does it work?
It’s simple: answer a few quick questions about your symptoms and eating habits. Within 2 minutes, you’ll receive a clear overview of possible food intolerances – all from the comfort of your own home. Based on your answers, we’ll give you the best possible advice and suggest the product that fits your symptoms – so you can enjoy your food again with confidence.
About Intoleran
We are a Dutch health brand founded in 2008, dedicated to helping people enjoy food again by providing targeted digestive enzyme supplements. Our products are developed by in-house dietitians, using only necessary ingredients, ensuring purity and effectiveness without unnecessary additives. With a commitment to quality and customer support, we offer dietary advice and have assisted over 100,000 satisfied customers worldwide.
- Specialist in digestive health since 2008
- Free dietary advice
- More than 100,000 satisfied customers