Taxonomic modifications to the genus Lactobacillus are actually established, what exactly now?

Why Lactobacillus Was Split Up, and What It Means for Readers

The title of this page points to a real scientific change. In 2020, microbiologists published a major reclassification of the genus Lactobacillus. The old genus had grown to more than 250 species, and genetic analysis showed they were far too diverse to belong in a single group. Researchers compared whole genomes and shared core genes and found clusters that behaved like separate genera. They then divided the old genus into 25 genera: a narrowed Lactobacillus and 23 new ones, plus the existing genus Paralactobacillus.

Many familiar names changed as a result. Lactobacillus casei and Lactobacillus rhamnosus are now placed in Lacticaseibacillus. Lactobacillus plantarum became Lactiplantibacillus plantarum. Lactobacillus reuteri moved to Limosilactobacillus. Species such as Lactobacillus acidophilus and Lactobacillus gasseri kept the original genus name. A useful detail is that most of the new names still begin with the letter "L." Abbreviations like L. rhamnosus therefore still work in everyday writing.

What actually changes

• The bacteria are the same. Only the labels changed. A strain found in yogurt or a supplement behaves exactly as it did before.
• Labels take time to update. Food and supplement packaging may show old names, new names, or both for years. Seeing either name on a product is not a sign of a problem.
• Strain codes matter most. The letters and numbers after a species name identify a specific strain. Research findings usually apply to particular strains, not to a whole genus.

Athletes, including basketball players logging long minutes through a season, often hear claims about probiotics for digestion or recovery. The evidence varies a great deal by strain and by purpose. Anyone thinking about supplements should talk to a doctor or registered dietitian rather than rely on label names alone.

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