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NCT Number: NCT07021170

Trial Comparing Elan Specialized Bariatric Supplements With Standard Multivitamins in Patients Undergoing Bariatric Procedures

Obesity has escalated to pandemic levels, impacting over 650 million adults globally and significantly contributing to the burden of non-communicable diseases such as type 2 diabetes, cardiovascular disease, obstructive sleep apnea, non-alcoholic fatty liver disease, and infertility. The chronic, multifactorial nature of obesity presents substantial challenges for long-term management, as lifestyle modifications and pharmacotherapy often yield limited and transient success. In this context, Metabolic and bariatric surgery (MBS) has emerged as the most effective and enduring treatment for obesity, offering significant weight loss and marked improvement or remission of obesity-related comorbidities.

The most prevalent MBS procedures include sleeve gastrectomy (SG), Roux-en-Y gastric bypass (RYGB), and one-anastomosis gastric bypass (OAGB). While these interventions offer considerable metabolic advantages, they inherently cause significant modifications to gastrointestinal anatomy and physiology, which can predispose patients to long-term micronutrient deficiencies. These deficiencies can stem from reduced dietary intake, altered gastric acid secretion, decreased intrinsic factor production, and the bypassing of critical absorptive sites in the gastrointestinal tract. Commonly affected nutrients encompass iron, vitamin B12, Vitamin B6, folate, vitamin D, calcium, and zinc. If not effectively managed, these nutrient deficiencies can lead to anemia, secondary hyperparathyroidism, osteopenia, neurological complications, immune dysfunction, and impaired postoperative recovery.

Population-based recommended dietary allowances (RDAs) and tolerable upper intake levels (ULs) tend to underestimate the nutritional requirements for postoperative patients, as they are derived from healthy cohorts. Many standard formulations may fall short due to inadequate dosages, non-bioavailable forms, or poor tolerability, which can significantly impact patient adherence to supplementation regimens. Over-the-counter multivitamins, such as Centrum®, are designed for the general population and often lack the dosing, bioavailability, or elemental forms required for post-MBS physiology, particularly following bypass procedures.

The American Society for Metabolic and Bariatric Surgery (ASMBS) recommends 8-22 mg of elemental zinc per day, depending on the procedure, and the International Federation for the Surgery of Obesity and Metabolic Disorders (IFSO) and the World Gastroenterology Organization (WGO) recommend up to 30 mg/day for OAGB patients. These values are below the national upper limit in Egypt, which is 25 mg/day.

Moreover, there is evidence indicating a discrepancy in nutrient deficiencies among different bariatric surgery patients; for instance, OAGB patients exhibit a greater prevalence of iron and zinc deficiencies compared to those undergoing RYGB or SG, thereby necessitating proportionally higher supplementation tailored to their specific needs.

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Key information

Conditions

Vitamin Deficiencies Avitaminosis Deficiency Diseases Malnutrition Nutrition Disorders Nutritional and Metabolic Diseases

Age range

18 year–65 year

Sex eligibility

All sexes

Study type

Interventional

Phase

Phase 4

Primary location

The surgical department of Medical Research Institute Hospital, Alexandria University

Alexandria, Alexandria Governorate, 21531, Egypt

Location status: Recruiting

Location contact

Mohamed Ashour, Ph.D. (Professor)

CONTACT

[email protected]

+201002600970

About this study

Consequently, specialized supplements containing adjusted doses of iron, zinc, and copper, within or slightly exceeding international guideline recommendations, are proposed to address the heightened risk of deficiencies, particularly in MBS procedures such as RYGB and OAGB, which are both clinically necessary and scientifically supported. In response to these shortcomings, specialized MBS supplements have been formulated to meet the unique physiological requirements and anatomical changes associated with each surgical procedure. The Elan Bariatric Supplement line, featuring Elan Believe for sleeve gastrectomy, Elan Compass for Roux-en-Y gastric bypass, and Elan Supreme for omega-loop gastric bypass, illustrates this tailored approach. It combines procedure-specific formulations aimed at optimizing nutrient absorption, minimizing gastrointestinal side effects, and enhancing patient compliance.

Despite the theoretical benefits of these specialized formulations, robust evidence supporting their clinical superiority over standard multivitamins remains scarce. Randomized controlled trials are warranted to ascertain whether these tailored supplements lead to improved nutritional status, enhanced tolerability, and superior overall outcomes in the post-MBS population. The present study intends to bridge this gap by evaluating the incidence of micronutrient deficiencies, along with biochemical and clinical outcomes, and patient compliance over 12 months between individuals receiving specialized Elan supplements and those utilizing standard multivitamins following SG, RYGB, and OAGB. This trial will stratify its analysis based on the type of surgery to assess the differential impacts of supplementation per the distinct anatomical and absorptive characteristics of these three procedures.

Who can participate

Healthy volunteers accepted: Yes

Only the study team can determine whether someone qualifies for participation.

Inclusion criteria

Eligible participants must be adults:

  • Aged 18 to 65 years
  • Capable of providing informed consent
  • Willing to comply with study procedures and follow-up visits over 12 months.
  • Candidates must have no prior history of MBS or gastrointestinal surgery and must be scheduled for one of the three aforementioned primary procedures.
  • Both male and female patients will be considered, and no restrictions will be placed based on ethnicity or socioeconomic status.

Exclusion criteria

Exclusion criteria

include:

  • The presence of chronic conditions that may independently affect micronutrient metabolism or absorption, such as chronic kidney disease, inflammatory bowel disease, or hepatic insufficiency.
  • Additional exclusion criteria include pregnancy or lactation at the time of enrollment
  • Plans for pregnancy within the study period
  • Active malignancy
  • Any use of investigational drugs or supplements within the past 30 days.
  • Patients undergoing revisional bariatric surgery or conversion procedures will also be excluded.

Treatment and study plan

Elan Believe

Dietary Supplement

Elan Believe is formulated specifically for patients undergoing SG and contains 18 mg of elemental zinc.

Elan Compass

Dietary Supplement

Elan Compass is tailored for RYGB and contains 24 mg of zinc.

Elan Supreme

Dietary Supplement

Designed for OAGB, provides 36 mg of zinc.

Standard Multivitamins

Dietary Supplement

Over-the-counter multivitamin containing 100% of the recommended daily allowance (RDA) for essential vitamins and minerals. Unlike the specialized formulations, the standard multivitamin is not designed to accommodate the altered gastrointestinal absorption characteristics of post-MBS patients.

Primary outcomes

  1. Incidence of postoperative micronutrient deficiencies at 3, 6, and 12 months following surgery.

    Time frame: 3, 6, and 12 months following surgery.

    Deficiencies will be assessed for six key micronutrients commonly affected by bariatric procedures: iron, vitamin B12, folate, vitamin D, calcium, and zinc. Thresholds for biochemical deficiency will be defined according to institutionally accepted reference ranges and international clinical guidelines. All measurements will be performed on fasting blood samples collected during scheduled follow-up visits.

Secondary outcomes

  1. Measures of compliance

    Time frame: At 6 and 12 months

    Will be assessed using a complementary method: monthly pill counts.

  2. Measures of tolerability

    Time frame: At 3, 6, and 12 months following surgery

    Tolerability will be assessed through systematic reporting of adverse events, with particular attention to gastrointestinal symptoms that may impair adherence. Events will be recorded at each follow-up visit and classified according to severity and their potential relationship to the study supplement.

  3. Changes in biochemical markers (hemoglobin, ferritin, parathyroid hormone, and magnesium)

    Time frame: Over the 12-month follow-up period.

    Biochemical outcomes will also include trends in hemoglobin, ferritin, parathyroid hormone (PTH), and magnesium levels over the 12-month follow-up period.

  4. Anthropometric changes

    Time frame: from enrollment till the end of the study (12 months)

    Changes in BMI (weight and height will be combined to report BMI in kg/m^2) at 3, 6, and 12 months. (weight in kilograms, height in meters)

  5. Anthropometric changes

    Time frame: from enrollment till the end of the study (12 months)

    Changes in body weight and adiposity measure including %EWL (weight in kilograms) at 3, 6, and 12 months. %EWL is defined as the percentage of above-ideal body weight lost.

  6. Compliance with supplementation

    Time frame: Administered at 6 and 12 months

    Compliance with supplementation will be assessed using a complementary method: Validated five-item Medication Adherence Report Scale (MARS-5), administered at 6 and 12 months. The MARS-5 instrument evaluates common non-adherence patterns and yields a cumulative score ranging from 5 to 25, with higher scores indicating greater adherence. Participants will be categorized into three adherence levels: high (scores of 23 to 25), moderate (scores of 20 to 22), and low (scores below 20). These adherence classifications will be used to explore associations between adherence and clinical outcomes.

Study contacts

Contact information is provided by the study sponsor or research team.

Mohamed Ashour, Ph.D. (Professor)

CONTACT

[email protected]

+201002600970

Sponsors and collaborators

Lead sponsor

General Committee of Teaching Hospitals and Institutes, Egypt

Other Gov

Registry information

Official study title

A Double-Blinded Randomized Controlled Trial Comparing Elan Specialized Bariatric Supplements With Standard Multivitamins in Patients Undergoing Sleeve Gastrectomy, Roux-en-Y Gastric Bypass, and One-Anastomosis Gastric Bypass

Important dates

Study start
2025
Primary completion
2026
Study completion
2026
First posted
Jun 13, 2025
Registry last updated
Sep 16, 2025

OpenTrials presents study information sourced from ClinicalTrials.gov. The official registry record should be consulted for the latest information.

View the official ClinicalTrials.gov record (opens in a new tab)

This listing is for discovery and informational purposes only. It is not medical advice, does not guarantee that a study is recruiting, and does not determine eligibility. Contact the study team and a qualified healthcare professional when considering participation.

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