Natren LifeStart B Dairy Infant Probiotic, 2.5 oz

Natren LifeStart B Dairy Infant Probiotic — 2.5 oz | Bifidobacterium infantis NLS

Bifidobacterium infantis is the dominant bacteria in the gut of exclusively breastfed infants — and it earned that status for a specific reason. Among all known gut bacteria, B. infantis is uniquely equipped to metabolize HMOs (human milk oligosaccharides), the prebiotic fraction of breast milk that constitutes its third-largest component by mass. B. infantis carries a specialized set of enzymes — including lacto-N-biosidase — that allow it to break down these complex oligosaccharides into short-chain fatty acids (particularly acetate) that lower gut pH to ~5.5, creating an acidic environment that suppresses the growth of pathogenic bacteria. No other common infant gut bacterium can fully metabolize HMOs. Critically, many modern infants — particularly those born by C-section or formula-fed — are not adequately colonized with B. infantis from birth, because B. infantis is transmitted primarily through vaginal birth and breastfeeding. Natren's LifeStart B delivers this specific strain in a dairy-based powder that mixes into breast milk or formula. Suitable from birth through 12 months.

Key Benefits

• B. infantis — HMO Metabolism: The only infant gut bacterium with a complete HMO metabolism gene cluster (including lacto-N-biosidase) — produces acetate from breast milk oligosaccharides to acidify and protect the infant gut
• Gut pH Protection: B. infantis fermentation lowers gut pH to ~5.5 — creating a naturally acidic environment that inhibits pathogenic colonization (Clostridium, E. coli, Staphylococcus)
• Critical for C-Section & Formula-Fed Infants: Many modern infants lack adequate B. infantis due to reduced transmission from vaginal birth and breastfeeding — supplementation helps restore this foundational colonizer
• Immune System Foundation: Early gut microbiome colonization shapes long-term immune regulation — B. infantis colonization in infancy is associated with reduced risk of allergy, eczema, and inflammatory conditions
• Easy Administration: Powder mixes into breast milk, formula, or a small amount of water
• Natren's NLS Strain: Non-GMO, gluten-free dairy-based probiotic; Natren's proprietary stable delivery system ensures viable organisms through the expiration date

How to Use

Mix recommended amount into breast milk, formula, or water. Daily use from birth helps establish and maintain B. infantis colonization. Always consult your pediatrician before introducing supplements to your infant.

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