Entry 22
Probiotic science page
Uses immune modulation to reduce allergic sensitization and respiratory symptoms in children, with RCT evidence.
Overview
B. breve M-16V is a probiotic strain developed by Morinaga Milk Industry (Japan). It was isolated from the feces of a healthy human infant [1]. It is predominantly studied in neonatal and pediatric populations. Evidence supports its use for prevention of necrotizing enterocolitis (a severe gut disease in premature babies) in preterm infants, adjusting allergic responses, and restoration of gut microbiota following cesarean section [1,2]. M-16V is recognized as safe for use in preterm and term infant populations [1].
Mechanism
M-16V tunes intestinal and systemic immune responses through interaction with toll-like receptors (TLR-2, TLR-4) on dendritic cells. This promotes a Th1/Th2 balance favorable to tolerance induction [1]. The strain reduces intestinal permeability. It attenuates allergic inflammation through TGF-beta-mediated pathways, as demonstrated in mouse models of food allergy and asthma [1,3]. M-16V colonizes the neonatal gut. It promotes the establishment of a Bifidobacterium-dominant microbiota, particularly when combined with prebiotic oligosaccharides (scGOS/lcFOS) [2,4].
Health Benefits
Wong et al. (2019) provide a comprehensive strain-specific review. It documents evidence from over 20 clinical studies. These include RCTs for necrotizing enterocolitis prevention, reduction of allergic symptoms in infants with atopic dermatitis (eczema), and improved microbiota composition in cesarean-delivered infants [1] [review]. Wang et al. (2025) conducted an RCT (n=152). They demonstrated that synbiotic formula containing M-16V restored Bifidobacterium-dominant microbiota in cesarean-born infants by 12 weeks [2] [RCT]. Chew et al. (2024) conducted an RCT (n=40). They showed M-16V plus scGOS/lcFOS in young child formula improved gut microbiota and iron status in healthy toddlers [4] [RCT]. Athalye-Jape et al. (2025) conducted an RCT (n=56 preterm infants). They compared live vs. heat-inactivated M-16V and demonstrated live probiotic colonization patterns [5] [RCT]. Multi-strain RCT evidence (with BB536 and M-63) supports efficacy for seasonal allergic rhinitis in children [6] [RCT, multi-strain].
Biology
Taxonomy: Bifidobacterium breve (valid species per Approved Lists 1980). It is Gram-positive, only grows without oxygen, non-motile, non-spore-forming, and irregular rod-shaped. It ferments carbohydrates via the bifid shunt, producing acetate and L(+)-lactate. It does not ferment pentoses or gluconate, which is a key difference from B. longum. Habitat: infant gastrointestinal tract. It is a human milk-associated species.
Bibliography
Wong CB, Iwabuchi N, Xiao JZ. (2019). Exploring the Science behind Bifidobacterium breve M-16V in Infant Health. Nutrients. 11(8):1724. PMID: 31349739
Wang Y, Wopereis H, Kakourou A, Liu M, Wu J, Li Z, et al. (2025). Restoration of gut microbiota with a specific synbiotic-containing infant formula in healthy Chinese infants born by cesarean section. Eur J Clin Nutr. 79(6):567-575. PMID: 39915586
Saez-Fuertes L, Kapravelou G, Grases-Pinto B, Massot-Cladera M, Bernabeu M, Knipping K, et al. (2024). Impact of maternal Bifidobacterium breve M-16V and scGOS/lcFOS supplementation during pregnancy and lactation on the maternal immune system and milk composition. Front Immunol. 15:1418594. PMID: 38975337
Chew C, Matsuyama M, Davies PSW, Hill RJ, Morrison M, Martin R, et al. (2024). A young child formula supplemented with a synbiotic mixture of scGOS/lcFOS and Bifidobacterium breve M-16V improves the gut microbiota and iron status in healthy toddlers. Front Pediatr. 12:1193027. PMID: 39469104
Athalye-Jape G, Esvaran M, Patole S, Nathan EA, Doherty DA, Sim E, et al. (2025). Effects of a live versus heat-inactivated probiotic Bifidobacterium spp in preterm infants: a randomised clinical trial. Arch Dis Child Fetal Neonatal Ed. 110(2):177-184. PMID: 39153842
Miraglia Del Giudice M, Indolfi C, Capasso M, Maiello N, Decimo F, Ciprandi G. (2017). Bifidobacterium mixture (B longum BB536, B infantis M-63, B breve M-16V) treatment in children with seasonal allergic rhinitis and intermittent asthma. Ital J Pediatr. 43(1):25. PMID: 28270216
Available Products
Morinaga supplies M-16V as freeze-dried powder (M-16V Probiotic Cultures) to infant formula manufacturers globally. It is used in infant formulas (Danone Nutricia Neocate Syneo, Mead Johnson Enfamil), synbiotic preterm and term infant formulations, and hospital neonatal protocols in Japan, Australia, and New Zealand [1,2].