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At a glance
| Quick fact | Details |
|---|---|
| Group | Lactobacillus (name unchanged after the 2020 reclassification) |
| Natural home | Vagina, gut and breast milk |
| Role in FemiCore | Pairs with L. crispatus for female microbiome support |
| Amount in FemiCore | Not disclosed |
| Evidence level | Early for urogenital health |
| Main cautions | Seriously ill or immunocompromised people |
What is L. gasseri?
L. gasseri is a lactic acid bacterium found naturally in the human body. Along with L. crispatus, L. jensenii and L. iners, it is one of the species that most often dominate the vaginal microbiome of healthy women. It has also been studied in the gut, where some strains have been explored for digestive and metabolic effects.
Why it is included in FemiCore
Its natural presence in the female urogenital tract makes L. gasseri a logical partner for L. crispatus in a women’s formula. The seller’s references include an educational article about L. gasseri and vaginal health.
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What the research shows
Research on L. gasseri in women’s health is still developing. Observational work recognizes L. gasseri-dominant vaginal communities as common in healthy women, though some research suggests L. crispatus-dominant communities may be the most stable. Clinical trials of oral L. gasseri for urinary outcomes are limited. As with all probiotics, findings depend on the strain studied.
The dose problem: weight, not CFU
FemiCore lists its five probiotics together as a 50 mg blend. Probiotic potency is normally described in colony-forming units (CFU), the number of live organisms able to multiply, along with a specific strain code. A weight figure includes the bacteria plus the carrier powder they are dried with, so it does not tell you how many live L. gasseri cells are in each capsule, or whether they survive until the expiry date. Because benefits are strain- and dose-specific, NIH cautions that it is often unknown which probiotic products help, at what dose, and for whom.
Can oral probiotics reach the urinary tract?
When you swallow a probiotic, it passes through the stomach and intestines. Some researchers think that lactobacilli can move from the gut to the vaginal and perineal area, which may in turn influence the urinary tract. This route is plausible but not fully established, and results vary widely between people. It is one reason why oral probiotics for urinary health remain an open research question rather than a proven approach. A 2015 Cochrane review found no clear evidence that probiotics, as studied so far, reduce UTIs.
Safety
L. gasseri is a member of a bacterial group with a long history of apparently safe use in healthy people, including in fermented foods. NIH notes that the risks of probiotics are higher for people with severe illness or weakened immune systems, and that some products have contained organisms not listed on the label. Possible mild side effects include gas and bloating during the first days.
Ask a doctor first if you: are undergoing chemotherapy, take immunosuppressants, have had an organ transplant, have a central venous catheter, or are seriously ill.
Interactions
Antibiotics can kill probiotic bacteria. If you are prescribed antibiotics, ask your clinician whether to pause FemiCore or space the doses. People on immunosuppressants should seek advice before taking any live probiotic.
Everyday ways to support your own lactobacilli
Supplements are only one influence on your microbiome. Day-to-day habits matter too, and they cost little:
- Use antibiotics only when prescribed, and finish the course as directed.
- Avoid douching and scented intimate products, which can disturb the vaginal microbiome.
- Wear breathable cotton underwear and change out of damp clothing promptly.
- Include fermented foods such as plain yogurt or kefir, if they suit you.
- Stay well hydrated during the day and urinate after sex, a simple step clinicians often suggest for women prone to UTIs.
These habits support a healthy environment regardless of whether you choose to take FemiCore.
Its role in the FemiCore formula
L. gasseri strengthens the women’s-health logic of FemiCore’s blend. It is a sensible choice, but its dose and strain are unknown, and its direct effect on bladder symptoms has not been demonstrated.
Bottom line
L. gasseri is a natural fit for a women’s formula, with early and strain-specific evidence. For the whole picture, see the FemiCore ingredients page and our research summary.
Ready to decide?
Packages start at $49 per bottle when you choose six, with free US shipping and a 60-day money-back guarantee from the seller. Check the latest price and stock on the seller’s secure checkout.
Check availability & price →Paid link: we may earn a commission at no extra cost to you. Sold by the seller via BuyGoods, not by this site.
Frequently asked questions
How much L. gasseri is in FemiCore?
The amount is not disclosed. L. gasseri is one of five species in a 50 mg probiotic blend, and the label does not give a CFU count or strain code.
Is L. gasseri safe?
For most healthy adults, L. gasseri is considered low risk, with mild gas or bloating possible at first. People who are seriously ill or immunocompromised should ask a doctor before taking any probiotic.
Is L. gasseri good for vaginal health?
It is a common member of the healthy vaginal microbiome, and some strains have been studied for vaginal health. Evidence is still developing and strain-specific.
Sources
Last reviewed and updated: October 20, 2026.
*These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.