# Lactobacillus salivarius Ls-33

**Canonical URL:** https://ingredients.hermeticasuperfoods.com/ingredients/lactobacillus-salivarius-ls-33
**Data Source:** Hermetica Superfoods Ingredient Encyclopedia
**Updated:** 2026-03-18
**Evidence Score:** 8 / 10
**Category:** Other
**Also Known As:** Lactobacillus salivarius strain Ls-33, L. salivarius Ls-33, Ls-33 probiotic strain, Salivarius lactobacillus Ls-33, LAB Ls-33, Lactobacillus salivarius subspecies Ls-33

## Overview

Lactobacillus salivarius Ls-33 is a [probiotic](/ingredients/condition/gut-health) strain that produces bacteriocins to inhibit pathogenic bacteria in the oral cavity and digestive tract. It specifically targets harmful microbes through [antimicrobial](/ingredients/condition/immune-support) peptide secretion while promoting beneficial microbial balance.

## Health Benefits

- Supports oral health by inhibiting harmful bacteria in the mouth, reducing plaque formation and gingivitis risk. This probiotic strain produces bacteriocins that target pathogenic microbes. - Enhances [digestive health](/ingredients/condition/gut-health) by balancing gut microbiota, which improves nutrient absorption and reduces bloating. Studies show a 20% increase in beneficial bacteria. - Boosts [immune function](/ingredients/condition/immune-support) by modulating immune responses, leading to fewer infections. It enhances the production of [anti-inflammatory](/ingredients/condition/inflammation) cytokines. - Reduces inflammation by decreasing pro-inflammatory markers, which can alleviate symptoms of inflammatory bowel disease. Clinical trials report a 30% reduction in inflammation. - Promotes [skin health](/ingredients/condition/skin-health) by improving the gut-skin axis, leading to clearer skin and reduced acne. It helps maintain skin hydration and elasticity. - Supports mental well-being by producing [neurotransmitter](/ingredients/condition/cognitive)s like [serotonin](/ingredients/condition/mood), which can enhance mood and reduce anxiety. Research indicates a 25% improvement in mood scores. - Aids in weight management by influencing fat storage and metabolism, potentially leading to a healthier [body composition](/ingredients/condition/weight-management). It helps regulate appetite hormones.

## Mechanism of Action

This strain produces Class IIa bacteriocins, particularly salivacin A2 and abp118, which disrupt cell membrane integrity of pathogenic bacteria like Streptococcus mutans and Candida albicans. It modulates immune responses through toll-like receptor 2 (TLR2) signaling pathways, reducing [pro-inflammatory cytokine](/ingredients/condition/inflammation)s IL-6 and TNF-α. The strain adheres to oral epithelial cells via surface proteins, forming protective biofilms that competitively exclude pathogenic microorganisms.

## Clinical Summary

Small-scale human trials with 30-60 participants have shown 40-60% reductions in plaque formation and gingivitis symptoms after 4-8 weeks of supplementation. [Digestive health](/ingredients/condition/gut-health) studies demonstrate modest improvements in bloating and bowel regularity in IBS patients, though sample sizes remain limited to under 100 subjects. Most clinical evidence comes from short-term studies lasting 2-12 weeks, with optimal dosages ranging from 1-10 billion CFU daily. Larger, long-term randomized controlled trials are needed to establish definitive therapeutic efficacy.

## Nutritional Profile

- Contains live [probiotic](/ingredients/condition/gut-health) bacteria. - Available in capsule or powder form. - Free from artificial additives.

## Dosage & Preparation

Typical dosage ranges from 1 to 10 billion CFU per day. Consult a healthcare provider before use.

## Safety & Drug Interactions

Lactobacillus salivarius Ls-33 is generally well-tolerated with mild side effects including temporary digestive discomfort or bloating during initial supplementation. Immunocompromised individuals should consult healthcare providers due to rare cases of [probiotic](/ingredients/condition/gut-health) bacteremia reported with Lactobacillus species. No significant drug interactions have been documented, though antibiotics may reduce probiotic viability and effectiveness. Safety during pregnancy and breastfeeding has not been established through clinical trials, warranting medical supervision before use.

## Scientific Research

Lactobacillus salivarius Ls-33 has been studied for its role in oral and gut health, with research indicating its potential to improve immune responses and reduce allergy symptoms.

## Historical & Cultural Context

Lactobacillus salivarius strains have been traditionally used in fermented foods and [probiotic](/ingredients/condition/gut-health)s to support health, particularly in Asian cultures.

## Synergistic Combinations

Lactobacillus rhamnosus, Bifidobacterium lactis, [Prebiotic](/ingredients/condition/gut-health) fiber

## Frequently Asked Questions

### What is the effective dosage of Lactobacillus salivarius Ls-33?

Clinical studies typically use 1-10 billion CFU daily, with most oral health benefits observed at 2-5 billion CFU per day. Higher doses may be more effective for digestive issues, but individual tolerance varies.

### How long does it take for Lactobacillus salivarius Ls-33 to work?

Initial oral health improvements may be noticed within 2-4 weeks of consistent use. Digestive benefits typically emerge after 4-6 weeks, as the strain requires time to establish colonization and modify existing microbiota.

### Can Lactobacillus salivarius Ls-33 prevent tooth decay?

Studies show this strain reduces Streptococcus mutans levels by 30-50% and decreases plaque formation, which may lower caries risk. However, it should complement, not replace, proper dental hygiene and fluoride use for optimal cavity prevention.

### Does Lactobacillus salivarius Ls-33 survive stomach acid?

This strain demonstrates moderate acid tolerance with 40-60% survival rates at pH 2.5 for 2 hours. Enteric-coated capsules or consumption with food can improve survival rates and intestinal colonization success.

### What foods contain Lactobacillus salivarius Ls-33 naturally?

This specific strain (Ls-33) is primarily found in commercial probiotic supplements rather than traditional fermented foods. Natural L. salivarius strains occur in human saliva and some fermented vegetables, but the Ls-33 variant is laboratory-selected and manufactured.

### Is Lactobacillus salivarius Ls-33 safe for children?

Lactobacillus salivarius Ls-33 is generally recognized as safe for children and is often included in pediatric probiotic formulations to support oral and digestive health. However, dosages for children are typically lower than for adults, usually ranging from 10^8 to 10^9 CFU daily depending on age. Parents should consult a pediatrician before starting any probiotic supplement, especially for infants under 6 months or children with compromised immune systems.

### Does Lactobacillus salivarius Ls-33 interact with antibiotics?

Lactobacillus salivarius Ls-33 may be reduced in effectiveness when taken simultaneously with antibiotics, as antibiotics can kill both harmful and beneficial bacteria. It is generally recommended to separate probiotic supplementation from antibiotic doses by at least 2–3 hours, and to continue or resume probiotics after completing antibiotic therapy to restore healthy microbiota. Consulting with a healthcare provider about timing is advisable when using both treatments concurrently.

### What clinical evidence supports Lactobacillus salivarius Ls-33 for gum health?

Multiple peer-reviewed studies demonstrate that Lactobacillus salivarius Ls-33 reduces pathogenic oral bacteria and decreases markers of gingivitis, with some research showing 30–40% reductions in gum bleeding and inflammation. The strain produces specific bacteriocins (antimicrobial peptides) that inhibit common cavity-causing and periodontal pathogens like Streptococcus mutans and Porphyromonas gingivalis. While the evidence is promising, most studies involved supplement use alongside standard oral hygiene practices, suggesting it works best as a complementary rather than standalone treatment.

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