A prospective randomized study of patients undergoing a laparoscopic sleeve gastrectomy was performed. Patients were randomized into 2 groups: those patients receiving the multivitamin supplement during 3 months (Group 1), and those receiving the supplement during 12 months (Group 2). Laboratory data were recorded: vitamins and oligoelements at 3, 6 and 12 months after surgery.

A prospective randomized study of patients undergoing a laparoscopic sleeve gastrectomy was performed. Patients were randomized into 2 groups: those patients receiving the multivitamin supplement (Multicentrum, Pfizer, 1 tablet/day) during 3 months (Group 1), and those receiving the supplement during 12 months (Group 2). Laboratory data were recorded: vitamins (D, B12 and folic acid) and oligoelements (calcium, iron, phosphorus, magnesium and zinc) at 3, 6 and 12 months after surgery.

Inclusion Criteria:

• patients undergoing laparoscopic sleeve gastrectomy
• BMI >40 Kg/m2
• BMI > 35 Kg/m2 with the presence of comorbidities associated to obesity

Exclusion Criteria:

• documented gastroesophageal reflux
• patients with uncontrolled psychiatric disorders
• active infections or malignancies
• any other concomitant pathology considered as a contraindication for bariatric surgery.