About Lactococcus lactis
Primarily a dairy and kefir starter culture (including the cremoris and biovar diacetylactis variants); most strain codes here are fermentation organisms, not clinically studied probiotics. One exception, JCM 5805 ("Lactococcus lactis Plasma"), has immune-marker RCTs, but the strains typically listed in kefir/dairy blends have minimal isolated human evidence. Graded low.
What Lactococcus lactis supports
- Traditional dairy and kefir fermentation culture
- Limited human evidence; one strain (Plasma/JCM 5805) studied for immune markers
How much Lactococcus lactis to take
The RDA prevents deficiency. The effective range is what clinical trials used to actually move the outcome.
Effective
1–20
billion_cfu
No established therapeutic dose; a dairy/kefir starter organism. JCM 5805 ("Lactococcus lactis Plasma") immune trials use ~10-100 billion cells/day. Usually presence-only in blends; nominal range.
Clinical evidence
Limited clinical evidence. Low: mainly a fermentation starter; sparse isolated clinical data.
NIH Fact Sheet