This simple test can help you determine if dairy is causing your discomfort.
Please note, if you aren't sure how your digestive system will react, we recommend taking the test on the weekend or at a time when you plan to be mostly at home. If this test indicates you may be lactose intolerant, you should confirm the diagnosis with your doctor.
You may also want to monitor your body's response to products containing lactose to figure out how much you can eat or drink comfortably.
Calcium & Lactose Tracker
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- Don't eat anything after 10pm on the evening before the test.
- The next morning, eat your normal breakfast and include a 12-oz. glass of regular milk (any kind is fine: whole, fat free, chocolate, whatever you like.)

- Over the next six hours, keep track of any discomfort you may have and its intensity using the test checklist. Keep an eye on your body's response to products containing lactose so you can figure out how much lactose you can ingest comfortably. See the comparison chart below.
Print the Dairy Digestion Test Checklist

1. Don't eat anything after 10pm on the evening before the test.
2. Prepare the exact same breakfast you had on Day 1.
3. Take a LACTAID®Fast Act Dietary Supplement with your first bite of dairy food. Or, drink a 12-oz. glass of LACTAID® Milk (any variety is fine) in place of the brand of milk you had on Day 1.
Over the next six hours, keep track of any discomfort you may have and its intensity using this test checklist.
Common signs and symptoms of lactose intolerance include:
*Abdominal pain
*Diarrhea
*Gas
*Bloating
Symptoms appear anywhere from 30 minutes to two hours after eating dairy.
4. If you plan on eating or drinking food or beverages containing dairy other than LACTAID® Milk during the remainder of the day, be sure to take a LACTAID® Fast Act Dietary Supplement with your first bite.
Learn how much lactose is in your favorite dairy products with this comparison chart.
(If you experience unusual or extreme discomfort, consult a doctor.)
Test Results
If you didn't experience discomfort during Day 2, or if the symptoms were much milder than those recorded in Day 1, you may be lactose intolerant. Consult your doctor to confirm this diagnosis.
If you experience the same symptoms both days, other foods or factors may be causing your discomfort, and we recommend consulting your doctor.
Note that you must take LACTAID® Fast Act Supplements if you consume any dairy foods other than LACTAID® Milk on Day 2. If the discomfort continues, increase the amount of LACTAID® Fast Act you take next time you consume any dairy foods. Do not wait to take LACTAID® Fast Act once symptoms occur. LACTAID® Fast Act must be consumed with the first bite of dairy foods to be effective. If LACTAID® Fast Act does not help reduce your symptoms, check with your doctor.
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