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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Suffering from lactose intolerance?

Trouble digesting lactose?

Enjoy dairy again with Intoleran Lactase!

Intoleran Lactase 20,000 is our strongest enzyme supplement, specially formulated to act-fast and help reduce occasional gas, bloating, and discomfort associated with digesting dairy.*

Thanks to the high dosage of 20,000 FCC-units lactase enzyme in each serving size, the tablets are highly effective. Ideal when you are very sensitive to lactose or when consuming larger amounts of lactose.

Helps reduce gas and bloating associated with digesting dairy*

Highest dosed lactase tablet for the entire meal

Easy to break tablet

Vegan, dairy, gluten and soy free

Low FODMAP Certified™ and Based on scientific research

Affordable and available over the counter

Start enjoying dairy products again in just three simple 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

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4.59 – Excellent
View all reviews
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
29/12/2025
I can enjoy my favorites again!
I have to admit, I didn’t think this would work, but the product delivered more than I could have hoped
Verified review
27/12/2025
Tried it and it did nothing to help…
Tried it and it did nothing to help with gas.
Verified review
27/12/2025
I had trouble ordering directly from…
I had trouble ordering directly from the company in the past so I then went through a well-known vendor. This past time everything went smoothly.
Verified review
26/12/2025
Fast shipping & seems to help
Product seems to help! It’s only been a few meals but it already seems more effective than enzyme blends from other companies that I’d tried in the past. Haven’t noticed any negative effects. My order shipped quickly and arrived in just a few days, which was very helpful.
Verified review
25/12/2025
Very helpful and responsive
Very helpful and responsive
Verified review
25/12/2025
Quick
Quick, accurate delivery.
Verified review
22/12/2025
It’s a capsule
It’s a capsule. Easy to carry with me.
Verified review
22/12/2025
Really seems to be helping me!
Really seems to be helping me!
Verified review
21/12/2025
Great Product
Great service.
Verified review
19/12/2025
I have been using this for at least a…
I have been using this for at least a year if not longer. What a difference it makes. I have many foods I can’t eat because they make me sick. I have started taking this when I go out to eat or people who think they are being careful make my food. I call it my just increase pill. What a difference it has made
Verified review
19/12/2025
Intoleran quatrase has opened up a…
Intoleran quatrase has opened up a world of more varied eating for me that I thought was gone forever. Their lactaid is pure, unlike the popular brand in grocery stores that has FODMAP unfriendly additives.
Verified review
19/12/2025
I like that you have the samples
I like that you have the samples. That’s how I was able to try them without spending tons. Also just gave samples pack to my adult son, easier than loose pills.
Verified review
18/12/2025
Very helpful for those of us that have…
Very helpful for those of us that have enzyme deficiency.
Verified review
18/12/2025
Quatrase 10,000 is amazing
Quatrase 10,000 is the only single digestive aid that allows me to eat foods that I normally would have to avoid due to multiple food intolerances. Taking a single pill(s) for multiple issues reduces stress when full ingredient lists are not provided.
Verified review
18/12/2025
I like that it is in mini tabs so I can…
I like that it is in mini tabs so I can titrate according to my needs for a particular meal. Wish it was more affordable, but that applies to all brands of dao.
Verified review
17/12/2025
Good product
Good product, good response from questions and good company overall
Verified review
15/12/2025
I take one each morning when I indulge…
I take one each morning when I indulge in espresso shots with full fat cream! I am so blessed to be able to enjoy coffee with cream, and Intoleran makes this possible!
Verified review
11/12/2025
Intoleran works as described
Intoleran works as described. I don’t need to say more. My only critic is that shipping takes forever!!! I would like faster methods for a choice.
Verified review

100-Day Satisfaction Guarantee!

We believe in our product, and we want you to as well. Try Lactase 20,000 risk-free for 100 days. If you still get bloated after the intake of starch or sucrose and you’re not fully satisfied, 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 Lactase 20,000

Science-based

Healthcare professionals and dietitians support our scientifically-backed solution.

lactose intolerant betekenis

What is lactose?

Lactose is a specific type of sugar found in milk and other dairy products. The enzyme lactase breaks down lactose into glucose and galactose, allowing the intestinal wall to absorb it. If there is insufficient lactase enzyme present, lactose cannot be broken down and absorbed in the small intestine.

Intoleran products contain the digestive enzyme lactase, which aids in the digestion of lactose, reducing the risk of associated complaints.

Watch our video on lactose intolerance!

Discover the power of lactase enzymes

Are you done skipping all the delicious foods containing dairy?

Lactase 20.000 is specially formulated with the digestive enzyme Lactase, designed to help with the digestion of Lactose and dairy. It Helps reduce occasional gas, bloating, and discomfort associated with lactose intolerance.


Shop our popular lactase supplements

Lactase Drops

Lactase Drops

0.47 fl oz (14 ml)
  • Helps reduce gas and bloating associated with digesting dairy*
  • Contains the liquid Lactase enzyme, baby safe!
  • Lactose-free cooking and baking
  • Lactose (milk sugar) is primarily found in milk, cheese and other dairy products
Lactase 20,000

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

Once a Day

30 Capsules
  • Helps reduce gas and bloating associated with digesting dairy*
  • Contains probiotics that actively produce the lactase enzyme in the gut*
  • One capsule a day for 24/7 relief!
  • Lactose (milk sugar) is primarily found in milk, cheese and other dairy products
Lactase 10,000

Lactase 10,000

36 Capsules
  • Helps reduce gas and bloating associated with digesting dairy*
  • Highest dosed Lactase capsule 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

Lactase 2500

Dispenser 100 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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