Starch-entrapped Microspheres [Nutrabiotix Fiber] for Gut Health (NTX)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT01210625
Recruitment Status : Active, not recruiting
First Posted : September 28, 2010
Last Update Posted : April 12, 2018
Information provided by (Responsible Party):
Rush University Medical Center

September 23, 2010
September 28, 2010
April 12, 2018
July 2010
October 2019   (Final data collection date for primary outcome measure)
Subject satisfaction [ Time Frame: 2011 ]
Subjects self report improvement of BM, Nutrabiotix is better tolerated [less side effects per subjects self report] and has a better prebiotic activity [higher stool SCFA/indoles ratios as the primary outcome; comparably more Bifidobacteria as the secondary outcome].
Same as current
Complete list of historical versions of study NCT01210625 on Archive Site
stool weight [ Time Frame: 2011 ]
increased stool weight
Same as current
Not Provided
Not Provided
Starch-entrapped Microspheres [Nutrabiotix Fiber] for Gut Health
A Randomized, Double Blind, Controlled, Dose Ranging Trial to Compare Nutrabiotix Fiber to Psyllium Fiber in Patients Experiencing Constipation.
The investigators hypothesize that daily oral intake of starch-entrapped alginate microspheres (called Nutrabiotix fiber) is well tolerated, exhibits no or minimal "typical" side effects of fiber (e.g. bloating, loose stool, flatulence), can be used as an ideal vehicle to deliver anti-oxidants/anti-inflammatory natural and synthetic substances/agents; and promote gut health by improving bowel habit, by changing the gut microbiota and increasing production of short chain fatty acids, especially butyrate, in the colon and decreasing production of protein putrification (prebiotic effects).

The long-term objective of our research program is to show that targeted colonic delivery of natural specific fermentable carbohydrates will maintain and promote gut health by changing the gut microbiota [prebiotic effect], by increasing "protective and growth promoting" factors such as butyrate, and enhancing intestinal barrier function. These health-promoting functions may prevent and treat a wide range of disorders associated with an abnormal microbiota (dysbiosis) and/or disrupted gut barrier function. Examples of disorders associated with dysbiosis and disrupted gut barrier (leaky gut) are allergic disorders, inflammatory bowel disease, diverticular disease, colon polyps and cancer, alcoholic liver disease, non-alcoholic steatohepatitis (NASH- the most common liver disease in the USA), and irritable bowel syndrome (IBS, the most common GI illness in the US with a high loss of productivity and a high rate of utilization of health care resources).

Nutrabiotix fiber is a prebiotic and is able to promote gut health through changes in the stool microbiota composition favoring saccharolytic bacteria like Bifidobacteria and diminishing proteolytic bacteria like Clostridia. This change in the intestinal microbiota composition should result in increases in the products of carbohydrate fermentation [SCFA] and decreases in the products of protein breakdown [indoles and phenols] in the stool. Also, the fiber is well tolerated and without side effects and is an effective fiber that increases stool bulk and regulates bowel movement.

Phase 1
Phase 2
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Other
  • Dietary Supplement: Nutrabiotix
    Fiber supplement: 9mg or 12mg
  • Dietary Supplement: Psyllium
    12g total per day (4 capsules containing 1 gram psyllium fiber 3 times a day)
  • Active Comparator: Psyllium
    Subjects will take 4 capsules containing 1 gram psyllium fiber 3 times a day (12g total per day)
    Intervention: Dietary Supplement: Psyllium
  • Experimental: Nutrabiotix 9g
    Subjects take a total of 9g of Nutrabiotix a day (3 capsules of 1g Nutrabiotix 3 times a day)
    Intervention: Dietary Supplement: Nutrabiotix
  • Experimental: Nutrabiotix 12g
    Subjects take a total of 12g of Nutrabiotix a day (4 capsules of 1g Nutrabiotix 3 times a day)
    Intervention: Dietary Supplement: Nutrabiotix
Rasmussen HE, Hamaker B, Rajan KB, Mutlu E, Green SJ, Brown M, Kaur A, Keshavarzian A. Starch-entrapped microsphere fibers improve bowel habit but do not exhibit prebiotic capacity in those with unsatisfactory bowel habits: a phase I, randomized, double-blind, controlled human trial. Nutr Res. 2017 Aug;44:27-37. doi: 10.1016/j.nutres.2017.05.015. Epub 2017 Jun 2.

*   Includes publications given by the data provider as well as publications identified by Identifier (NCT Number) in Medline.
Active, not recruiting
Same as current
October 2019
October 2019   (Final data collection date for primary outcome measure)

Inclusion Criteria:

  • Healthy, asymptomatic 18 to 65 years subjects with BMI 20-30 and self described unsatisfactory bowel habit

Exclusion Criteria:

  1. Abnormalities in CBC (Hgb <12 g/dL, platelet count <100 000, WBC <4000 or >10 000);
  2. Abnormal liver function tests (ALT, AST, alkaline phosphatase, or bilirubin >1.5 times normal range);
  3. Abnormal renal function tests (BUN or creatinine >1.5 times normal range);
  4. Low serum albumin (<3 g/dL);

5) Abnormal TSH level;

(6) High CRP;

(7) Significant GI symptoms (except for constipation or occasional rectal bleeding due to hemorrhoids);

(8) Prior intestinal resection;

(9) Patient history of GI diseases [except for hemorrhoids or occasional (<3 times a week) heartburn];

(10) Antibiotic use within last 12 weeks prior to enrollment;

(11) Lean (BMI <25) or obese (BMI>30) subjects because obesity could be associated with abnormal microbiota;

(12) Significant cardiac or respiratory diseases (defined by requiring daily medication for management of their diseases);

(13) Severe hypertension (defined as uncontrolled hypertension in spite of therapy, or requirement of more than one medication to treat hypertension; well-controlled, mild hypertension may be included);

(14) Insulin-requiring and/or poorly controlled diabetes (well-controlled diabetics with HbA1c <6 may be enrolled);

(15) Significant psychological disorders;

(16) Drug and/or alcohol abuse;

(17) Unwillingness to consent to the study;

(18) Plan to have a major change of the dietary habit during the following 5 months;

(19) Subjects younger than 18 or older than 65. Older subjects are excluded in this initial study because of high co-morbidity in older subjects. Children are excluded for this initial Phase I study where the safety is not established;

(20) Pregnant and lactating women due to lack of information about safety of the product in pregnant and lactating women.

Sexes Eligible for Study: All
18 Years to 65 Years   (Adult)
Contact information is only displayed when the study is recruiting subjects
United States
Not Provided
Not Provided
Rush University Medical Center
Rush University Medical Center
Not Provided
Principal Investigator: Michael Brown, M.D. Rush University Medical Center
Rush University Medical Center
April 2018

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP