Bifidobacterium animalis W53 (B. animalis W53)

Bifidobacterium animalis W53 is a specific probiotic bacterial strain belonging to the Bifidobacterium genus, which is a natural inhabitant of the human gastrointestinal tract [2][7]. It is widely utilized as a key ingredient in multi-strain probiotic supplements, such as OMNi-BiOTiC 6, to restore microbial balance and support intestinal health [4][8]. The strain functions by strengthening the gut barrier through the upregulation of tight junction proteins and by producing short-chain fatty acids (SCFAs) like acetate and lactate, which inhibit the growth of pathogens by lowering the intestinal pH [2][14]. Clinically, B. animalis W53 is associated with the management of various gastrointestinal conditions, including irritable bowel syndrome (IBS), antibiotic-associated diarrhea, and chronic constipation [7][13]. It also exerts immunomodulatory effects by interacting with the gut-associated lymphoid tissue (GALT) to regulate the production of cytokines such as TNF-alpha and IL-10 [12][16]. While not a traditional molecular target, its therapeutic efficacy is influenced by the use of antibiotics, which can reduce its viability, and prebiotics, which serve as essential growth substrates [2][6]. The strain is generally considered safe for consumption, although caution is advised for patients with severe immunodeficiency or central venous catheters due to the rare risk of translocation [3][10].

Other names

Bifidobacterium animalis subsp. lactis W53Bifidobacterium animalis strain W53

Competitive exclusion of pathogens, enhancement of intestinal tight junctions, and modulation of host cytokine production [2][14][16].