L. Bulgaricus is one of the first probiotic strains ever studied. The Russian Nobel Prize winner, Ilya Mechnikov, first isolated Lactobacillus Bulgaricus around 1882 when he discovered the probiotic’s role in beneficial digestion.
Ilya Mechnikov found L. Bulgaricus in fermented sour milk. He attributed the longevity of the Balkans people to their consumption of sour milk, fermented foods and the L. Bulgaricus probiotic that was in these foods.
In the 1960’s and 1970’s there was extensive research on this probiotic by Russian researchers such as Dr. Ivan Bogdanov. Here is a full list of the benefits:
Here is an article on probiotics side effects.
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Mater DD, Bretigny L, Firmesse O, Flores MJ, Mogenet A, Bresson JL, Corthier G. Streptococcus thermophilus and Lactobacillus delbrueckii subsp. bulgaricus survive gastrointestinal transit of healthy volunteers consuming yogurt. FEMS Microbiol Lett. 2005 Sep 15;250(2):185-7.
Dimitonova SP, Danova ST, Serkedjieva JP, Bakalov BV. Antimicrobial activity and protective properties of vaginal lactobacilli from healthy Bulgarian women. Anaerobe. 2007 Oct-Dec;13(5-6):178-84.
Kano H, Mogami O, Uchida M. Oral administration of milk fermented with Lactobacillus delbrueckii ssp. bulgaricus OLL1073R-1 to DBA/1 mice inhibits secretion of proinflammatory cytokines. Cytotechnology. 2002 Nov;40(1-3):67-73.
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