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Lactobacillus gasseri SBT2055: a fermented-milk trial is not evidence for every capsule

A trial in Japanese adults studied a specific gasseri strain delivered in fermented milk. Its abdominal-fat findings cannot be assigned to every product that uses the species name.

Read the evidence ↓

Supplement Science Insights Editorial Team

Published September 23, 2026

The strain and food matrix were specified

The randomized, double-blind trial enrolled 210 Japanese adults with relatively large visceral fat areas. Participants consumed fermented milk containing one of two concentrations of L. gasseri SBT2055 or fermented milk without that strain for 12 weeks. [1]

The active groups had reductions from baseline in CT-measured visceral fat area, reported at about 8%. The control group did not show a significant baseline reduction. These percentages concern visceral fat area, not an 8% reduction in total body weight. [1]

The result did not demonstrate a permanent change

The reported effects weakened during four weeks after participants stopped taking the fermented milk. The abstract does not establish durability beyond that period or equivalence of an unrelated capsule. [1]

A strain-specific food trial also does not identify an effect for all people or all gasseri strains. Funding and conflicts were not fully assessed from the abstract; this page reports the narrow study finding rather than ranking retail weight-loss products. [1]

Keep the denominator attached

Imagine a scan-derived fat area falls by 8%. Reporting that as 8% body-weight loss would change the outcome and exaggerate what the measurement says.

Evidence summary — Lactobacillus gasseri SBT2055
DetailInterpretation
SBT2055Named strain
Fermented milkTested delivery
Visceral fat areaNot total body weight
Lactobacillus gasseri SBT2055: a fermented-milk trial is not evidence for every capsule — original article outline diagram
Original editorial diagram of this article’s sections; no product photograph or clinical finding is depicted.

Sources for this article

  1. Effect of Lactobacillus gasseri SBT2055 in fermented milk on abdominal adiposity in adults in a randomised controlled trial - PubMed
    Source consulted: 2026-09-19. This is a reference resource, not a claim that we conducted the studies or tested a product.