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Pilot Trial of Chromium-Metformin Combination in Type 2 Diabetes

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: NCT00332085
Recruitment Status : Terminated (Issues w/recruitment)
First Posted : June 1, 2006
Last Update Posted : October 31, 2007
Information provided by:
Bastyr University

Tracking Information
First Submitted Date  ICMJE May 30, 2006
First Posted Date  ICMJE June 1, 2006
Last Update Posted Date October 31, 2007
Study Start Date  ICMJE January 2006
Primary Completion Date Not Provided
Current Primary Outcome Measures  ICMJE
 (submitted: May 30, 2006)
  • Safety/Adverse Events
  • Hemoglobin A1c
Original Primary Outcome Measures  ICMJE Same as current
Change History
Current Secondary Outcome Measures  ICMJE
 (submitted: May 30, 2006)
  • Fasting Blood Glucose, Fasting Insulin, HOMA Index
  • Lipid Profile: total cholesterol, LDL, HDL, Triglycerides
  • Oral Glucose Tolerance Test
Original Secondary Outcome Measures  ICMJE Same as current
Current Other Pre-specified Outcome Measures Not Provided
Original Other Pre-specified Outcome Measures Not Provided
Descriptive Information
Brief Title  ICMJE Pilot Trial of Chromium-Metformin Combination in Type 2 Diabetes
Official Title  ICMJE Pilot Trial of Chromium-Metformin Combination in Type 2 Diabetes: Impact on Blood Sugar Control and Insulin Resistance
Brief Summary This pilot trial seeks to gather preliminary data on the combination of chromium picolinate, the most commonly used form of chromium, and metformin. The trial will recruit type 2 diabetes subjects already on metformin and treat them with chromium for 8 weeks. The results of this trial will provide vital preliminary data including safety and size of effect to direct future studies.
Detailed Description

Chromium is widely marketed for use in diabetes and is used as a dietary supplement by approximately 10 million US consumers, second only to calcium supplementation. Limited scientific research has supported the potential of chromium to be beneficial in diabetes to improve blood sugar control and insulin sensitivity, yet many of these studies have design flaws and the relevance of the research in the US population has been questioned. Research on use of complementary & alternative medicine (CAM) suggests as many as 40% use CAM in combination with conventional medicine. Research performed at the Bastyr Center for Natural Health suggests 69% of patients get chromium as part of their treatment and 45% are on oral medications for blood sugar control. Metformin is the most commonly prescribed oral medication for diabetes in the world. The combination of chromium and metformin has never been studied in a clinical trial despite frequent use in combination. Additionally, research suggests chromium and metformin share at least one mechanism of action leading to questions about possible interactions - both favorable and unfavorable - resulting from the combination.

Type 2 diabetes remains the sixth leading cause of death in the US. Despite evolving technology and development of new medications, epidemiological data shows that only 37% of patients are in good glycemic control as defined by the American Diabetes Association. Recent large trials (UKPDS) suggest that any improvement in blood sugar control leads to favorable outcomes.

Human research suggests chromium improves insulin receptor sensitivity leading to blood sugar reduction. Research also shows blood levels of chromium are lower in people with type 2 diabetes and diabetic patients lose more chromium in their urine than people without diabetes.

This pilot trial will recruit type 2 diabetic subjects already on metformin and treat them with chromium picolinate for 8 weeks. The results of the trial will provide vital preliminary data including safety and size of effect to direct future, larger studies.

Study Type  ICMJE Interventional
Study Phase  ICMJE Phase 1
Study Design  ICMJE Allocation: Randomized
Intervention Model: Single Group Assignment
Masking: Double
Primary Purpose: Treatment
Condition  ICMJE Type 2 Diabetes
Intervention  ICMJE Drug: Chromium Picolinate
Study Arms  ICMJE Not Provided
Publications * Not Provided

*   Includes publications given by the data provider as well as publications identified by Identifier (NCT Number) in Medline.
Recruitment Information
Recruitment Status  ICMJE Terminated
Estimated Enrollment  ICMJE
 (submitted: May 30, 2006)
Original Enrollment  ICMJE Same as current
Actual Study Completion Date  ICMJE March 2007
Primary Completion Date Not Provided
Eligibility Criteria  ICMJE

Inclusion Criteria:

ICD-9 Diagnosis of TYpe 2 Diabetes (250.XX) for two years or less and treated with metformin Patients having completed dose titration of metformin as prescribed by their physician and have reached a stble dose between 1000-2550 mg per day for at least two months HbA1c: 7.0-10.5%

Exclusion Criteria:

  • Duration of metformin treatment longer than 1 year at start time of study medication Historical or current use of oral anti-diabetes (OAD) medication (other than metformin) or use of insulin History ofmyocardial infarction within the lat 6 months, unstable angina, uncontrollable hypertension with systolic greater than 180 or diastolic greater than 110.

Clinical or objective finding suggestive of congestive heart failure. Individuals not receiving routine management by their primary car eproviders and/or endocrinologists for their type 2 diabetes, including routine ECG and ophthamological evaluations.

Women of child-bearing age not using standard birth control measures. Hemoglobin <11 or > 16; Hematocrig <32 or > 50; WBC <3,000 or >12,000; Platelets <150,000 or >500,000 Serum Creatinine >1.4 mg/dL; BUN >25 mg/dL Presence of greater than +1 protein on random macroscopic urinalysis at screening without a rule out of microalbuminuria Total bilirubin >1.5 mg/dL LFTs: AST>60 IU/L; ALT>65/L; Alkaline phosphatase >120 Iu/L. Isolated LFT elevations with an ultrasound diagnosis of non-alcoholic Steatohepatitis and a lab rule out of viral hepatitis will be included in the study with careful monitoring of LFTs.

Subjects currently taking nutritional supplements, including multivatmin for study duration; subjects will be asked to discontinue any nutritional supplementation at the screening telephone interview 1 week prior to screening lab work and 4 week sprior to baseline lab work.

Subjects taking lipid lowering medications except statins (i.e. niacin, fibrates, resins) due to possible chromium binding.

Sex/Gender  ICMJE
Sexes Eligible for Study: All
Ages  ICMJE 18 Years to 65 Years   (Adult, Older Adult)
Accepts Healthy Volunteers  ICMJE No
Contacts  ICMJE Contact information is only displayed when the study is recruiting subjects
Listed Location Countries  ICMJE United States
Removed Location Countries  
Administrative Information
NCT Number  ICMJE NCT00332085
Other Study ID Numbers  ICMJE 190
Has Data Monitoring Committee Not Provided
U.S. FDA-regulated Product Not Provided
IPD Sharing Statement  ICMJE Not Provided
Responsible Party Not Provided
Study Sponsor  ICMJE Bastyr University
Collaborators  ICMJE Not Provided
Investigators  ICMJE
Principal Investigator: Ryan Bradley, ND Bastyr University
PRS Account Bastyr University
Verification Date October 2007

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