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.

Suffering from multiple food intolerances?

Trouble digesting carbohydrates?

Then our quatrase supplements are perfect for you!

Quatrase 10,000 is an 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 reduce occasional gas, bloating and discomfort associated with FODMAP intolerance without a restrictive diet.*

Helps reduce digestive issues without a restrictive diet*

Enzymes specially designed for FODMAP issues

Multiple food intolerance formula

Helps reduce occasional gas, bloating & indigestion*

Vegan, dairy, gluten and soy free

Affordable and available over the counter

Enjoying food in just three steps!

Step 1

Shop your desired supplements at intoleran. The supplements will be on your doorstep in 2 – 5 days.

Step 2

We offer Free Shipping over $10! We ship our products throughout the US free of charge for orders of $10 or more. Below $10 we charge $5.50

Step 3

Experience what Starchway can do for you and enjoy your favorite meals again!
Join the 100.000 happy customers we’ve supported.
No effect money back


Trusted by more than 100.000 happy customers and professional dietitians worldwide

Trusted Shops icon
4.54 – Excellent
View all reviews
20/06/2025
Good products for food intolerances
Good products for food intolerances
Verified review
18/06/2025
My husband uses it but because of cost…
My husband uses it but because of cost he can’t use it as much as he would like.
Verified review
17/06/2025
My son has pretty severe lactose…
My son has pretty severe lactose intolerance and Lactaid just doesn’t cut it. He loves that he can take ONE Intoleran instead of 4 or 5 of the others and eat the foods he loves.
Verified review
16/06/2025
Still waiting for my shipment
Still waiting for my shipment
Verified review
15/06/2025
Takes forever to arrive
Takes forever to arrive
Verified review
13/06/2025
Excellent customer service
Excellent customer service! Quick, detailed and very helpful. Super quick shipping as well!
Verified review
12/06/2025
Lower cost?
Lower cost?
Verified review
12/06/2025
Wife needed this so bad.
The wife needed intoleran because of her extreme intolerance to lactose she got after giving birth to her son. Intoleran has given her the ability to eat ice cream again or even drink chocolate milk and not have any issues!
Verified review
11/06/2025
Intoleran
Intoleran, in conjunction with Sucraid and Lactaid, have improved my quality of life.
Verified review
07/06/2025
Too many capsules to be effective
I need to take many multiple capsules. The cost is excessively prohibitive. I don’t even get 3 weeks out of over $200 worth. The price needs to be 50% of what it is now or the capsules need to contain much more product.
Verified review
07/06/2025
Shipping takes 10 days
Shipping takes 10 days
Verified review
06/06/2025
Only received cardboard packaging
Only received cardboard packaging, pills were missing. I also tried to modify my order right after i submitted it but there was no way to cancel it.
Verified review
04/06/2025
This is the best product for me
This is the best product for me. I can live again in these 1 to 4 hours 3 times a day. To make it better would be longer time. I tell everybody about this pill.
Verified review
02/06/2025
Shipping takes 10 days
Shipping takes 10 days
Verified review
02/06/2025
I have only used this product a short…
I have only used this product a short time but like the fact that it works. I am still being careful but only positive results. I like that it is a pill and can put in my purse when eating away from home.
Verified review
31/05/2025
Game changer!!
Game changer!!! Being vegetarian and going out to eat was very limiting and really impacted our social outings. Have tried it twice and it really worked!!!!
Verified review
31/05/2025
Sweet Relief
Intoleran Starchway has helped me with sucrose intolerance when nothing else could , unless I was prepared to pay thousands of $’s every month. It’s not 100% but I’m about 80%better than before I discovered it. So glad to have found it!!
Verified review
28/05/2025
Great product
Great product
Verified review
27/05/2025
The option to get a discount to buy 3…
The option to get a discount to buy 3 items (or more) at a time should be more obvious & easier to find. Thank you.
Verified review
27/05/2025
The price is a bit high
The price is a bit high, but the results are great. The lack of symptoms is like a breath of fresh air. Haven’t felt this good in a very long time.
Verified review
25/05/2025
I am able to eat again without pain, nausea and bloating!
For the first time since having radiation treatments for cancer I am able to eat without getting nauseated and bloated! What a gift to find these enzymes!
Verified review
25/05/2025
Did not meet shipping garuntee
The order will arrive way beyond the garunteed time frame. I am leaving on a trip and depended on this garuntee. I plan to return the product and go with another company since not meeting the first promise they have made to me is not a good sign that a company can be trusted, in my opinion.
Verified review
24/05/2025
Great customer service
So far so good and the most exceptional Customer Service I have ever received.
Verified review
21/05/2025
It works
It works. Have sample to try instead of paying a lot of money on product not working. Efficient and fast Thank you for your help
Verified review
17/05/2025
Highest quality, enzymatic quantity, and new life for daughter
Very crisp, clean, and easy to browse & learn before ordering. These enzymes are THE ONLY ONES that work for my daughter; no other brand besides Intoleran actually has enough of the particular enzymes she needs. Thank you for making your products, as it’s allowed my daughter to participate in eating and not feel gravely ill.
Verified review
16/05/2025
Alternative to sucraid
Alternative to Sucraid
Verified review
15/05/2025
Quatrase is a life saver!
I have suffered from GI issues for years now, and the Quatrase has made a world of difference. Thank you!
Verified review
15/05/2025
will carbo starch have a subscription…
will carbo starch have a subscription option? I now take starchway and DAO mini. Wondering if Carbostarch would be better and if so i would like that option
Verified review
13/05/2025
I need it with every meal or snack.
I need it with every meal or snack.
Verified review
13/05/2025
Very quick de
Very quick delivery
Verified review
13/05/2025
Too expensive
Too expensive
Verified review
12/05/2025
Works well
Once a day works great for me. Ordering is easy and comes within a few days!
Verified review
10/05/2025
Rate before use or receipt of same
Asking me to rate the product before I’ve even received it is tacky.
Verified review
03/05/2025
Excellent quality nutraceuticals
Excellent quality nutraceuticals. Very effective and unique on the market.
Verified review
03/05/2025
The product I purchased has helped me alot.
The product I purchased has helped me alot. I can go back to eating food that I couldn’t before
Verified review
03/05/2025
The enzymes work for me!!
The enzymes work for me!!
Verified review
02/05/2025
I use intoleran starchway which helps…
I use intoleran starchway which helps my digestion. My doctor recommended it and I’m glad he did!
Verified review
02/05/2025
Great products, feel more included with friends.
After a long journey I found out that my issues were with FODMAP’s. Intoleran team is very knowledgeable, answering all my complex questions about what products to take and how much. I assume the person answering my emails was involved in making or studying there products because my questions were very in depth and thoroughly answered. If you have an issue tolerating Fructans, Fructose, or Lactose give this company a try. I ate my worst trigger foods while on a low FODMAP diet and showed no reaction during or days later. I’m glad I took a shot by purchasing the sample packs.
Verified review
29/04/2025
My daughter was diagnosed with …
My daughter was diagnosed with fructose intolerance. She was quite frustrated with not being able to eat out with her friends. After finding Intoleran she has found freedom to be able to eat out with her friends again.
Verified review
22/04/2025
Intoleran has been a life changer
Intoleran has been a life changer. I can eat foods again I thought I would have to avoid forever. I can enjoy date nights and cooking again. I love the little metal packaging but my curbside recycle doesn’t pick up metal other than cans, so I’m currently trying to figure out how to recycle the packaging. Wish I could send them back for refills.
Verified review
16/04/2025
Never received my order
Ordered 3 things, Eagerly waited for it to arrive, when it finally said delivered it was nowhere to be found. Still waiting on a response to my email.
Verified review
15/04/2025
I used only one pill and it did the job…
I used only one pill and it did the job for my meal. It is hard to schedule snacks (waiting 30 minutes to eat). Working on getting used to using it.
Verified review
13/04/2025
Haven’t had enough experience with the…
Haven’t had enough experience with the supplement
Verified review
13/04/2025
My grandson has CSID and Starchway…
My grandson has CSID and Starchway allows him to eat a little more normally. This company has always provided a high quality product in a timely matter. I highly recommend!
Verified review
11/04/2025
I love this company and Starchway
I love this company and Starchway. Always professional. Takes care of my intolerance to starch and sucrose in one!
Verified review
09/04/2025
I need it with meal or snack.
I wouldn’t digest my food properly without starchway and quatrase with every meal and snack. They really work!
Verified review
08/04/2025
I’m still waiting for the delivery
I’m still waiting for the delivery. Not sure why this should take so long. Cannot rate the product at this time.
Verified review
07/04/2025
Excellent Pills, Difficult Payment
These pills are a life changer. I really truly need and appreciate them. That said, I cannot buy them with HSA funds, which is a real frustration, since they are so expensive. The payment goes through the Netherlands, so the HSA cards will not work. It’s a lot of money to pay out of pocket for as often as I need the pills.
Verified review
05/04/2025
Trusted
Trusted
Verified review
28/03/2025
The product works very well.
The product works very well. One of the orders was delayed, but did arrive.
Verified review

100-Day Satisfaction Guarantee!

We believe in our product, and we want you to as well.
Try Quatrase risk-free for 100 days.

if you are not happy with the resultsand you’re still experiencing digestive complaints we’ll give you a full refund—no questions asked.


Why Intoleran

Expert since 2008

Since 2008, we’ve dedicated ourselves to crafting nutritional supplements. Our team of dieticians meticulously develops our products with exceptional care. 

Pure ingredients

Crafted from pure, natural ingredients, our blend ensures everyone can enjoy the benefits of Quatrase.

Science-based

Healthcare professionals and dietitians support our scientifically-backed solution. Starchway is Low FODMAP certified by Monash University.

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What are digestive enzymes?

Digestive enzymes play an essential role in breaking down and digesting nutrients, such as complex carbohydrates (sugars). These specific enzymes ensure that complex carbohydrates are broken down into simpler sugars that the body can digest more effectively. If these complex sugars are not broken down, it can lead to side effects such as gas formation and fermentation, which can be quite discomforting.

Watch our video on digestive enzymes

Why choose Quatrase?

Quatrase contains a blend of various digestive enzymes that assist in the digestion of different hard-to-digest carbohydrates. For example, lactase helps in the digestion of lactose, and the enzyme alpha-galactosidase aids in the digestion of complex carbohydrates (fructans and galactans). Quatrase helps to reduce occasional gas, bloating, and discomfort associated with FODMAP intolerance


Shop our products for FODMAP intolerance

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!*

Quatrase 10,000

36 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

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

15% off!

starchway

Starchway

150 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
starchway

Starchway

50 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

Fibractase 1200

Testpack 6 Capsules
  • Enjoy beans, veggies and grains again and reduce gas & bloating!*
  • Helps with the digestion of complex carbohydrates*
  • Complex carbohydrates are primarily found in onions, garlic, wheat, soy and legumes
  • Fast-acting enzyme formula

Fibractase 1200 (Forte)

36 Capsules
  • Enjoy beans, veggies and grains again and reduce gas & bloating!*
  • Helps with the digestion of complex carbohydrates*
  • Complex carbohydrates are primarily found in onions, garlic, wheat, soy and legumes
  • Fast-acting enzyme formula

Fructase

Testpack 6 Capsules
  • Enjoy your fruits, sweets, and sugary drinks again!
  • Reduces occasional gas, bloating & indigestion associated with fructose*
  • Fructose (fruit sugar) is primarily found in fruits, fruit juice, vegetables, sweets and honey
  • Fast-acting enzyme formula
fructase

Fructase

36 Capsules
  • Enjoy your fruits, sweets, and sugary drinks again!
  • Reduces occasional gas, bloating & indigestion associated with fructose*
  • Fructose (fruit sugar) is primarily found in fruits, fruit juice, vegetables, sweets and honey
  • Fast-acting enzyme formula

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

15% off!

lactase

Lactase 20,000

50 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

Lactase 2500

Testpack 6 Tablets
  • Helps reduce gas and bloating associated with digesting dairy*
  • Small tablet for mild lactose intolerance
  • Easy to swallow, ideal for children
  • Lactose (milk sugar) is primarily found in milk, cheese and other dairy products

*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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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.

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