The Study
Effectiveness of a Bariatric-Specific Multivitamin Versus Conventional Targeted Supplementation for Preoperative Micronutrient Deficiency Correction in Bariatric Surgery Candidates: A Multicenter Retrospective Cohort Study
This study looked at two ways of giving vitamins to people before weight-loss surgery and noticed that one way seemed to work better. But it didn't randomly assign people—it just used the newer method later. So we can't say the new vitamin caused the improvement; maybe doctors got better at helping people over time.
Analysis score
Maximum 72 for a cohort study.
Where the score came from
People getting ready for weight-loss surgery often have low vitamins. Some took one pill with all needed vitamins, others took many separate pills.
Where does this study sit?
Reviews of RCTs (Meta-analyses)
Max 100Randomized Trials
Max 90Reviews of Cohort Studies
Max 85Cohort Studies
Max 72Reviews of Case-Control Studies
Max 63Case-Control Studies
Max 58Cross-Sectional & Case Series
Max 50Expert Opinion
Max 567 / 100
Quality score
Groups of people are followed over time to see who develops an outcome. Strong for identifying risk factors and associations, but cannot prove causation as firmly as RCTs.
Key takeaways
Summary
Based on the study abstract and findings.
- 1Yes — fixing all vitamin gaps faster means patients can have surgery sooner and are less likely to have complications afterward.
- 2After 4 weeks, 41 out of 100 people on the one-pill plan fixed all their vitamin gaps, while only 16 out of 100 on the many-pill plan did.
- 3People on the one-pill plan also took fewer pills daily (1 vs.
- 43.5) and remembered to take them more often (92% vs.
- 570%).
Score breakdown, methodology, conflicts of interest, evidence analysis & raw study data
Publication
Journal
Nutrients
Year
2026
Authors
Luigi Schiavo, Monica Mingo, Gianluca Rossetti, F. Rahimi, Simona Bo, Luigi Cobellis, F. Cobellis, Emmanuele Giglio, Lilia Bertolani, Vincenzo Pilone
Related Content
Claims (10)
Taking dietary supplements restores essential nutrient levels in people who eat modern diets, and this restoration restores normal physiological function.
In obese adults with three or more micronutrient deficiencies, taking a bariatric-specific multivitamin instead of multiple supplements reduced the number of daily pills taken and increased reported adherence to the supplement regimen.
Obese adults with multiple micronutrient deficiencies who took a bariatric-specific multivitamin were 2.69 times more likely to achieve full correction of their nutrient levels within four weeks, compared to those who did not, after accounting for initial deficiency levels and study site differences.
In obese adults with multiple nutrient deficiencies, a standardized bariatric multivitamin with moderate doses of nutrients leads to better correction of deficiencies than some personalized high-dose regimens, suggesting that simpler formulations can be more effective in practice.
Taking dietary supplements restores missing micronutrients from inadequate food intake and maintains normal bodily functions.
Among obese adults with multiple micronutrient deficiencies, those taking a bariatric-specific multivitamin followed their regimen 92% of the time, while those taking standard supplements followed theirs 70% of the time.
Not medical advice. For informational purposes only. Always consult a qualified healthcare professional before making health decisions.