About Lactobacillus casei
Renamed from Lactobacillus casei to Lacticaseibacillus casei (2020). Meta-analyses of fermented dairy strains (Shirota, DN-114001/CNCM I-1518) show reduced incidence/duration of common infections and antibiotic-associated diarrhea. Evidence is tied to specific fermented-milk strains; generic blend inclusion does not carry the same evidence.
What Lactobacillus casei supports
- Moderate evidence for reduced common-infection and diarrhea risk (specific strains)
- Studied for antibiotic-associated diarrhea prevention
How much Lactobacillus casei to take
The RDA prevents deficiency. The effective range is what clinical trials used to actually move the outcome.
Effective
1–20
billion_cfu
Fermented-dairy strains (Shirota, DN-114001/CNCM I-1518) studied at ~6.5-20 billion CFU/day; no universal dose. Often presence-only in blends; nominal range.
Clinical evidence
Moderate clinical evidence. Moderate: meta-analyses of specific fermented-dairy strains.
NIH Fact Sheet