Lactobacillus gasseri
Lactobacillus gasseri is a probiotic strain that supports gut health, weight management, and immune function, with evidence suggesting benefits for visceral fat reduction and modulation of the gut microbiome.
Evidence last reviewed: 20 Apr 2026
The evidence for Lactobacillus gasseri is moderate to high, showing benefits for gut health, sleep quality, and immune function. However, more extensive studies are needed to fully understand its effects and optimal dosages.
Vaginal health restorationChinese women with bacterial vaginosis · RCTModerate
Oral administration of Lactobacillus gasseri TM13, along with Lactobacillus crispatus LG55, helped restore vaginal health in patients recovering from bacterial vaginosis.
Improvement in sleep qualityGeneral adult population · Meta-analysisHigh
Lactobacillus gasseri CP2305 improved sleep quality as measured by the Pittsburgh Sleep Quality Index.
Anxiety and sleep disturbance reductionJapanese medical students under stress · RCTModerate
Lactobacillus gasseri CP2305 significantly reduced anxiety and sleep disturbances in stressed individuals.
Reduction in abdominal pain and improved bowel movementsWomen with functional constipation · RCTModerate
Lactobacillus gasseri significantly reduced abdominal pain and improved bowel movement frequency.
Immune function enhancementElderly individuals · RCTModerate
Heat-killed Lactobacillus gasseri enhanced immune function in elderly participants.
Forms & usage▾
Take 1-2 capsules daily with water, preferably before meals.