Frequently Asked Questions

How long will it take my order to ship?

Orders usually take 1-2 days to process and ship.

What is your return policy?

We have a 30-day return policy, which means you have 30 days after receiving your item to request a return. For more details on our policy go here.

I have a question about my order, what should I do?

Contact us at You may also call us at (561) 878-8054.

How do I reach Dr. Dennis directly?

You may contact him directly by emailing him at He usually responds within a few days.

How many net cards does Great Gut® Prebiotic Fiber have?

There is a total of about 6 grams of carbs, a little over 5g of which are fiber.  That leaves about 1g of net carbs.  Our formula is very keto-friendly.

Does this product have any soy?

No.  The formula contains no soy and no dairy.

I usually mix Benefiber with my morning coffee. Can this be mixed with coffee, which is non-carbonated?

The prebiotic fiber blend should mix very well with your coffee. Several of the prebiotics are actually complex sugars which might add a touch of sweetness to your drink. 

What benefits would your formula have over Prebiotin fiber?

Great Gut Extra-Strength Prebiotic delivers two key advantages over Prebiotin. First, is prebiotic diversity. Prebiotin has essentially two prebiotic sources, FOS and Inulin, which are pretty much longer and shorter chained versions of each other. We provide 4. IMO, FOS, XOS, Guar Fiber. The second key benefit is value. We offer 540g of prebiotics, approximately $0.05/g, for about the same price as they offer 240g, or approximately $0.11/g

When should I take my prebiotics?

We've found it's best take with meals; however, it should be fine to take any time.

 Is this fiber gluten free?

Yes, it is naturally gluten free and soy free, Great Gut Prebiotics is designed to nourish healthy bacteria to create balance and foster growth without these common allergens.