Skip to main content

Effect of Lactobacillus salivarius Ls-33 on fecal microbiota in obese adolescents.

  • 2013-12
  • Clinical Nutrition 32(6)
    • N. Larsen
    • F. Vogensen
    • R. Gøbel
    • K. Michaelsen
    • S. Forssten
    • S. Lahtinen
    • M. Jakobsen


Background & aims: This study is a part of the clinical trials with probiotic bacterium Lactobacillus salivarius Ls-33 conducted in obese adolescents. Previously reported clinical studies showed no effect of Ls-33 consumption on the metabolic syndrome in the subject group. The aim of the study was to investigate the impact of L. salivarius Ls-33 on fecal microbiota in obese adolescents.

Methods: The study was a double-blinded intervention with 50 subjects randomized to intake of L. salivarius Ls-33 or placebo for 12 weeks. The fecal microbiota was assessed by real-time quantitative PCR before and after intervention. Concentrations of fecal short chain fatty acids were determined using gas chromatography.

Results: Ratios of Bacteroides-Prevotella-Porphyromonas group to Firmicutes belonging bacteria, including Clostridium cluster XIV, Blautia coccoides_Eubacteria rectale group and Roseburia intestinalis, were significantly increased (p ≤ 0.05) after administration of Ls-33. The cell numbers of fecal bacteria, including the groups above as well as Clostridium cluster I, Clostridium cluster IV, Faecalibacterium prausnitzii, Enterobacteriaceae, Enterococcus, the Lactobacillus group and Bifidobacterium were not significantly altered by intervention. Similarly, short chain fatty acids remained unaffected.

Conclusion: L. salivarius Ls-33 might modify the fecal microbiota in obese adolescents in a way not related to metabolic syndrome.

Clinical trial number: [NCT 01020617]( 01020617 "See in").

Trial registration: NCT01020617.

Keywords: Fecal microbiota; Lactobacillus salivarius; Obesity; Probiotics.

Research Insights

SupplementHealth OutcomeEffect TypeEffect Size
Lactobacillus salivarius SD-5208Increased Short Chain Fatty AcidsNeutral
Lactobacillus salivarius SD-5208Unchanged Cell Numbers of Fecal BacteriaNeutral
Lactobacillus salivarius VPro 15Modified Fecal MicrobiotaNeutral

Pillser helps you make informed health decisions by providing comprehensive, unbiased information about supplements. This includes detailed research on supplement ingredients, their benefits, potential risks, and their overall efficacy. You can contribute by sharing your feedback and suggestions.

Send us an email at