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Lactobacillus gasseri

Supplement probiotic gutwomen's health
Aka: L. gasseri, Lactobacillus gasseri BNR17
Brands seen in Singapore: California Gold Nutrition, 21st Century, Garden of Life, NOW Foods, Lemme
Third-party tested: Garden of Life, Lemme certify other products with NSF Certified for Sport, but nothing for lactobacillus gasseri.Certification is granted per product, so check the tub you actually own. Not being listed is not the same as failing.
Not medical advice. Check with your doctor or pharmacist before you start, stop or change the timing of anything you take.
How to use
What it’s for
Vaginal colonisation in women · gut results are mixed
When to take
Daily
Take with
Water · oral capsules in the vaginal-colonisation trial
Studied for
Trials ran 18 days to 12 weeks
Pros & cons
Pros
  • Cect 30648 reached the vagina in 55.9% of women
  • Lactobacilli-dominated vaginal types rose in that trial
  • Cp2305 showed no adverse findings at 10^11 cells/day
Cons
  • Bnr17 showed no IBS efficacy in a 2026 review
  • The vaginal trial was 48 healthy women over 18 days
  • Sbt2055 fat data is one 12-week milk-drink trial
Sources
  1. Lactobacillus gasseri CECT 30648 shows probiotic characteristics and colonizes the vagina of healthy women after oral administration (Microbiol Spectr 2025; n=48) · read 2026-08-27
    what it says
    “Forty-eight healthy women … a capsule containing Lg (10^9 CFU) … up to 18 days … Lg but not Lc was detected in 55.9% of participants in active groups … positive transition toward lactobacilli-dominated community state types”
  2. Evaluation of the safety of high-dose Lactobacillus gasseri CP2305 supplementation in healthy adults: a randomized, double-blind, placebo-controlled study (Toxicol Rep 2026; n=43) · read 2026-08-27
    what it says
    “The L. gasseri CP2305 group consumed 1.0 x 10^11 cells of L. gasseri CP2305 cells per day … No adverse clinical findings were observed in either group … support the safety of L. gasseri CP2305 tablets even at high-dose intake”
  3. NIH ODS — Probiotics Fact Sheet for Health Professionals — Obesity (L. gasseri SBT2055 trial, n=210; read via archive.org) · read 2026-08-27
    what it says
    “One 12-week clinical trial … randomized 210 healthy adults … Participants who received 10^7 or 10^6 CFU/g milk of Lactobacillus gasseri experienced significant reductions in visceral fat area (mean reductions of 8.5% and 8.2%, respectively)”
  4. Strain-Specific Systematic Review with Meta-Analysis of Probiotics Efficacy in the Treatment of Irritable Bowel Syndrome (Maslennikov et al., J Clin Med 2026; 32 RCTs, 10 strains) · read 2026-08-27
    what it says
    “Meta-analyses demonstrated the efficacy of Bifidobacterium longum (formerly Bifidobacterium infantis) 35624 … and Bacillus coagulans Unique IS2 (MTCC 5260) … did not demonstrate the efficacy of Escherichia coli Nissle 1917, Lactobacillus gasseri BNR17, or Lactobacillus casei Shirota”
  5. NIH ODS — Probiotics Fact Sheet for Health Professionals — Identification / Mechanisms of action (read via archive.org; ods.od.nih.gov is Cloudflare-blocked) · read 2026-08-27
    what it says
    “Because the effects of probiotics can be specific to certain probiotic strains, recommendations for their use in the clinic need to be strain-specific … Probiotics may transiently colonize the human gut mucosa in highly individualized patterns”
  6. NIH ODS — Probiotics Fact Sheet for Health Professionals — Dietary Supplements (CFU labelling, shelf life) · read 2026-08-27
    what it says
    “Many probiotic supplements contain 1 to 10 billion CFU per dose, but some products contain 50 billion CFU or more. However, products with higher CFU counts are not necessarily more effective”
  7. NIH ODS — Probiotics Fact Sheet for Health Professionals — Dietary Supplements (viability at end of shelf life) · read 2026-08-27
    what it says
    “probiotics must be consumed alive … users should look for products labeled with the number of CFU at the end of the product's shelf life, not at the time of manufacture”
  8. NIH ODS — Probiotics Fact Sheet for Health Professionals — Safety Considerations · read 2026-08-27
    what it says
    “Probiotics are unlikely to cause harm in healthy people, and side effects are usually minor … linked to a few cases of bacteremia, fungemia, and infections … most of these cases involved individuals who were severely ill or immunocompromised”
  9. NIH NCCIH — Probiotics: Usefulness and Safety — What types of bacteria are in probiotics? · read 2026-08-27
    what it says
    “Different types of probiotics may have different effects. For example, if a specific kind of Lactobacillus helps prevent an illness, that doesn't necessarily mean that another kind of Lactobacillus … would do the same thing”
  10. NIH NCCIH — Probiotics: Usefulness and Safety — Can probiotics be harmful? / FDA 2023 preterm warning · read 2026-08-27
    what it says
    “The risk of harmful effects from probiotics is greater in people with severe illnesses or compromised immune systems … the FDA warned health care providers that premature infants who are given probiotics are at risk of severe, potentially fatal infections”
  11. HSA — Health Supplements Guidelines (January 2026), s3.1 working definition; Table 2 microbial limits; Tables 4–5 cover vitamins and minerals only · read 2026-08-27
    what it says
    “Vitamins, minerals, amino acids, fatty acids, enzymes, probiotics and other bioactive substances … The above limits for total aerobic microbial count, and yeast and mould may not be applicable to certain products such as probiotics”
  12. HSA — Guidelines on Prohibited and Restricted Ingredients in HS and TM, GL-CHPB-1-012 Rev. 001 (October 2025), clause 1.3 + Annex A/B · read 2026-08-27
    what it says
    “to highlight the substances of concern when used in HS and TM and is not meant to be an exhaustive list [no probiotic, Lactobacillus, Bifidobacterium, Bacillus or Akkermansia row appears in Annex A or B]”
  13. iHerb Singapore — 'Probiotic Supplements for Gut Health' category page, default order (page now Cloudflare-blocked; row carried over from the KB's probiotics entry, same access date) · read 2026-08-27
    what it says
    “California Gold Nutrition, LactoBif® 30 Probiotics … 21st Century, Cranberry Plus Probiotic … Garden of Life, Dr. Formulated Probiotics, Once Daily Women's, 50 Billion … NOW Foods, Probiotic-10™ … Lemme, Purr, Vaginal Probiotic Gummies”
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Updated 2026-08-30. Every line above traces to a numbered source. Kozen-X is not a medical device and does not give medical advice. It lists what published sources have written down — nothing more. A pair not listed is unrecorded, not cleared. Before you start, stop or re-time anything, talk to your doctor or pharmacist.