This reference glossary provides a technical overview of specific probiotic strains, detailing their documented mechanisms of action and the physiological areas—primarily gut health, skin integrity, and immune response—where clinical research has been concentrated. The data presented is derived from peer-reviewed studies and clinical trials, focusing on strain-specific outcomes rather than general species characteristics.
Lactobacillus Strains
| Strain Name | Primary Mechanism | Research Focus | Key Findings / Data |
|---|---|---|---|
| Lactobacillus rhamnosus GG (LGG) | High gastrointestinal survival and mucosal adhesion. | Atopic dermatitis, AAD, and pediatric gut health. | Associated with a reduction in the duration of acute diarrhea and potential prevention of atopic dermatitis in infants (NIH). |
| Lactobacillus plantarum HY7714 | Regulation of serine palmitoyltransferase (SPT) and ceramidase mRNA levels. | Skin hydration and anti-photoaging. | Clinical trials showed a 21.73% improvement in skin elasticity and significant reduction in wrinkle depth after 12 weeks (PubMed). |
| Lactobacillus acidophilus NCFM | Modulation of colonic mucosal opioid receptor (MOR) expression. | Bloating and functional abdominal pain. | Induces MOR mRNA expression, potentially modulating pain sensation in the colon (PMC). |
| Lactobacillus reuteri ATCC PTA 6475 | Inhibition of pro-inflammatory cytokines; modulation of bone metabolism. | Bone density and age-associated bone loss. | Supplementation reduced bone loss by approximately 50% in older women with low bone mineral density over 12 months (PubMed). |
| Lactobacillus casei Shirota | Activation of cytotoxic lymphocytes and NK cell activity. | Immune system modulation and resistance to infection. | Demonstrated to increase Natural Killer (NK) cell activity in healthy volunteers and smokers (PubMed). |
Bifidobacterium Strains
| Strain Name | Primary Mechanism | Research Focus | Key Findings / Data |
|---|---|---|---|
| Bifidobacterium animalis subsp. lactis BB-12 | Enhancement of barrier function and pathogen inhibition. | Bowel regularity and immune resistance. | Clinical data indicates an increase in defecation frequency by approximately 1 day per week in individuals with low frequency (PMC). |
| Bifidobacterium longum 1714 | Psychobiotic modulation of the gut-brain axis. | Stress response and cognitive performance. | Attenuates cortisol output and reduces subjective anxiety during acute social stress (PMC). |
| Bifidobacterium breve B-3 | Suppression of transepidermal water loss (TEWL) and epidermal thickening. | Skin photoaging and UV protection. | Research suggests potential for preventing UV-induced skin damage and maintaining skin barrier integrity (PubMed). |
Other Probiotic Organisms
| Strain Name | Primary Mechanism | Research Focus | Key Findings / Data |
|---|---|---|---|
| Saccharomyces boulardii (CNCM I-745) | Non-pathogenic yeast; survives gastric acidity to inhibit toxins. | Antibiotic-associated diarrhea (AAD). | Meta-analysis shows a significant reduction in AAD risk, with a relative risk (RR) of 0.47 (PMC). |
| Bacillus coagulans GBI-30, 6086 | Spore-forming bacterium; survives high heat and stomach acid. | IBS symptoms (pain and bloating). | Significantly improved self-reported abdominal pain and bloating scores in IBS patients over an 8-week period (PubMed). |
Last verified: 2026-06-30
Sources
- Lactobacillus rhamnosus GG - PMC
- Clinical Evidence of Effects of Lactobacillus plantarum HY7714 on Skin Aging - PubMed
- Lactobacillus acidophilus NCFM and Opioid Receptors - PMC
- Lactobacillus reuteri reduces bone loss in older women - PubMed
- Lactobacillus casei Shirota and NK cell activity - PubMed
- Bifidobacterium animalis subsp. lactis BB-12 and bowel function - PMC
- Bifidobacterium longum 1714 and Brain Activity - PMC
- Effect of Bifidobacterium breve B-3 on skin photoaging - PubMed
- Systematic review and meta-analysis of Saccharomyces boulardii - PMC
- Bacillus coagulans GBI-30, 6086 and IBS symptoms - PubMed