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Obesity & Overweight / Collagen-containing supplement / Collagen Protein · Observational Study
ClinicalTrials.gov · September 9, 2026
Early or partial results. Treat as a signal, not a conclusion.
This is a planned prospective observational cohort study comparing collagen supplement users and non-users after sleeve gastrectomy, with primary outcomes measuring muscle mass, body composition, and body image over 6 months postoperatively. No results are currently available; the study is recruiting and projected to complete in March 2027.
Observational. Obesity & Overweight, Collagen Protein, Bariatric Surgery, Metabolic and Bariatric Surgery, Body Composition, Muscle Composition, Body Image; age from 18 Years; to 65 Years; accepts healthy volunteers. Intervention: 1. Grup; 2. Grup. Compared with: Non-use of collagen-containing supplement (self-selected non-use by participants).. n = 52. 1 site: Turkey (Türkiye).
This is a planned prospective observational cohort study comparing collagen supplement users and non-users after sleeve gastrectomy, with primary outcomes measuring muscle mass, body composition, and body image over 6 months postoperatively. No results are currently available; the study is recruiting and projected to complete in March 2027.
Safety was not reported in the material analysed. Check the source before drawing any conclusion about harm.
This observational study cannot yet inform clinical practice, as no results are available. Once completed, it may provide preliminary evidence on whether collagen supplementation associates with differences in muscle preservation and body image after bariatric surgery, though the observational design limits causal inference. Clinicians should await results before interpreting findings.
This is a registry record for a planned observational study with no results reported; recruitment is ongoing with an estimated 52 participants per group and a projected completion date of March 2027.
As stated by the source record.
Quoted from the source exactly as published.
This observational study cannot yet inform clinical practice, as no results are available. Once completed, it may provide preliminary evidence on whether collagen supplementation associates with differences in muscle preservation and body image after bariatric surgery, though the observational design limits causal inference. Clinicians should await results before interpreting findings.
Graded across the dimensions that decide whether you should act, each from what the source actually supports. There is no single score, and where a dimension was not assessed it says so.
What is missing. This record has no key findings. That is a gap in the analysis, not a judgement about the study.
Registry record from ClinicalTrials.gov (NCT07809152). This is a study registration, not published results. Lead sponsor: Mudanya University. Recruitment status: RECRUITING. Study type: OBSERVATIONAL. Enrollment: 52 participants (ESTIMATED). Conditions: Obesity & Overweight, Collagen Protein, Bariatric Surgery, Metabolic and Bariatric Surgery, Body Composition, Muscle Composition, Body Image. Interventions: DIETARY_SUPPLEMENT: Collagen-containing supplement. Primary outcome measures: Change in Body Weight , Preoperative, and postoperative 2 weeks, 1 month, 3 months, and 6 months; Change in Body Shape Questionnaire (BSQ) Score , Preoperative and postoperative 6 months; Change in Body Mass Index (BMI) , Preoperative, and postoperative 2 weeks, 1 month, 3 months, and 6 months; Percentage of Total Weight Loss (%TWL) , Postoperative and 6 months; Percentage of Excess Weight Loss (%EWL) , Postoperative and 6 months; Change in Fat Mass , Preoperative, and postoperative 2 weeks, 1 month, 3 months, and 6 months; Change in Fat Mass Percentage , Preoperative, and postoperative 2 weeks, 1 month, 3 months, and 6 months; Change in Muscle Mass , Preoperative, and postoperative 2 weeks, 1 month, 3 months, and 6 months; Change in Muscle Mass Percentage , Preoperative, and postoperative 2 weeks, 1 month, 3 months, and 6 months. Brief summary: This prospective, observational cohort study aims to evaluate whether the use of collagen-containing supplements is associated with differences in muscle mass, body composition, and body image among patients who have undergone sleeve gastrectomy (SG). The study will be conducted at the General Surgery outpatient clinic of a private hospital in Bursa, Türkiye, between May 2026 and March 2027, and will enroll adult patients (aged 18-65 years) who meet current ASMBS/IFSO eligibility criteria for metabolic and bariatric surgery. Participants will be naturally allocated into two observational groups based on their own choice to use or not use collagen-containing supplements; no supplement will be provided or recommended by the study team, and no intervention will be made to participants' standard clinical care. All patients will be followed according to routine clinical practice preoperatively and at 2 weeks, 1 month, 3 months, and 6 months postoperatively. Primary outcome measures include anthropometric parameters (body weight, BMI, fat mass, fat mass percentage, fat-free mass, muscle mass, percentage of weight loss, percentage of excess weight loss, waist and hip circumference) assessed via bioelectrical impedance analysis (Tanita MC-780 MA), and body image assessed using the Turkish-validated Body Shape Questionnaire (BSQ). Secondary outcomes include biochemical parameters, comorbidities, and macronutrient intake data obtained from 3-day dietary records analyzed using the BEBİS nutrition software. The study hypothesizes that patients using collagen-containing supplements will show significant differences in muscle mass and body composition parameters compared with non-users, and that supplement use will be significantly associated with BSQ scores. A sample size of approximately 52 participants per group was calculated using G\*Power 3.1 (one-way ANOVA, Cohen's f = 0.25, α = 0.05, power = 0.80).
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