Bifidobacterium animalis lactis (often shortened to B. lactis) is a subspecies of Bifidobacterium animalis and one of the more well-studied probiotic strains. It occurs naturally in the human gut and is often added to fermented dairy products and probiotic supplements for health benefits.
Key Characteristics of Bifidobacterium lactis:
- Type: Gram-positive, anaerobic (thrives in low-oxygen environments like the gut).
- Shape: Rod-shaped (appears "bifid" or Y-shaped under a microscope).
- Survival: More resistant to stomach acid and bile than many probiotics, which helps it survive reaching the gut.
Where is it commonly found?
Some foods contain yogurt (e.g., Activia), kefir, fermented milk (e.g., Yakult), and some cheeses.
Supplements: Often labeled with B. lactis or a specific strain, such as BB-12® (an extensively researched, patented strain).
Health Benefits for Humans
- Helps with intestinal health: restores microbial balance, and relieves bloating, constipation, or diarrhea.
- Helps strengthen the intestinal barrier and reduce the risk of a "leaky gut".
- Boosts immunity: Enhances immune cell activity and reduces infection rates.
- Helps with lactose digestion: Helps break down lactose and helps those with lactose intolerance.
- Helps with metabolic support: May improve cholesterol levels and aid weight management.
- Has anti-inflammatory effects: Associated with reducing symptoms of irritable bowel syndrome (IBS) and intestinal inflammation.
Safety and Usage
Safe for most people, including infants and the elderly.
Rare side effects: Mild gas or bloating may occur with initial use.
Dosage: Typically 1 billion to 10 billion colony-forming units/day (varies by product).
Example strains:
BB-12® (extensively studied for promoting digestive and immune health).
HN019 (used in some supplements).
Do you want to learn how to choose a Bifidobacterium lactis product?