Lactobacilli are a group of bacteria named for their production of lactic acid. In her 2020 probiotic chapter, Campbell-McBride describes them as the first probiotic bacteria studied and used as supplements, and as a common group in commercial preparations.[1] Her product-selection guidance then looks beyond a Lactobacilli-only formula.
Which Species Make Up This Group
Lactobacilli is a family of related species. The source lists L. acidophilus, L. bulgaricus, L. rhamnosus, L. plantarum, L. salivarius, L. reuteri, L. johnsonii, L. casei and L. delbrueckii among the commonly known members.[1] Its later product-selection guidance prefers multiple species and a mixture of bacterial groups rather than Lactobacilli alone.[2][3]
Where They Live in the Body
Campbell-McBride describes Lactobacilli in the gut, the mucous membranes of the mouth, throat, nose and upper respiratory tract, the genital area and breast milk. Her discussion describes them being present at birth and becoming established during the newborn’s first days.[1] This is an account of resident microbes in the body. It is not a statement that every organism in a supplement takes up permanent residence.
The book gives Lactobacilli a protective role in the stomach and intestines, connecting their activity with the condition of the gut lining.[1]
What They Do
Campbell-McBride describes lactic acid production as helping maintain an acidic environment on mucous membranes, giving a range of pH 5.5 to 5.6.[1] That is the range used in her explanation, not a target to measure or adjust yourself throughout the body.
Beyond lactic acid, Lactobacilli produce a whole range of other active substances: hydrogen peroxide, which functions as a powerful antiseptic, along with antibacterial, antiviral, and antifungal agents that keep pathogens from establishing themselves.[1] They also engage the immune system directly, stimulating the activity of neutrophils and macrophages, the synthesis of immunoglobulins, alpha and beta interferons, interleukin-1, and tumor necrosis factor.[1] On top of that, they’re involved in orchestrating the cell renewal process in the gut, which is part of how they help keep the gut lining healthy and intact.[1]
Why This Group Matters on GAPS
The book connects Lactobacilli with acidic conditions, antimicrobial substances, immune activity and renewal of the gut lining.[1] Its selection guidance favors several microbial groups together: Lactobacilli, Bifidobacteria and spore-forming bacilli, with beneficial fungi as a possible addition.[2]
The group name alone does not tell you how you will respond to a product. In the histamine chapter, Campbell-McBride discusses different responses to named organisms and explicitly notes the limits of that research. Our histamine guide keeps that qualification with the species examples.[4]
Does Taking a Probiotic Mean It Stays Permanently?
No. The later part of the probiotic chapter says most supplemental organisms work in the gut lumen and pass out again. That is different from the book’s earlier description of resident Lactobacilli. See the long-term probiotic guide for how Campbell-McBride connects this distinction with daily fermented foods.[2]
Your Next Step
Continue with GAPS supplements guide, the Metchnikoff and Bulgarian Bacillus history, and Bacillus Subtilis Explained.
The Crock & Jar course is listed in my WFLI Shop.
References
- Campbell-McBride, Natasha. Gut and Physiology Syndrome (2020), “Nutritional Supplements for GAPS People,” “1. Probiotics”.
- Campbell-McBride, Natasha. Gut and Physiology Syndrome (2020), “Nutritional Supplements for GAPS People,” “1. Probiotics”, product selection, gradual introduction and ongoing intake.
- RIKEN Japan Collection of Microorganisms, JCM 1012, organism nomenclature.
- Campbell-McBride, Natasha. Gut and Physiology Syndrome (2020), “Histamine and Other Biogenic Amines,” gradual fermented-food introduction and individual microbial responses.
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