Buyer’s Guide: Probiotic Species and Strains

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Here’s a snapshot at different probiotic strains, when they’re useful and where to find them. Click to learn more about why we need probiotics.

Probiotic species & strains  Health benefits Where you’ll find it

Bifidobacterium longum


The most significant and important probiotics in the body, and among the first to colonize in the sterile GI tract of a newborn infant (also found in human breast milk). Stimulates the immune response and promotes microbial balance by crowding out bad bacteria that cause discomfort and neutralizing everyday toxins in the gut. Aids production and absorption of B vitamins, blocks harmful invaders, boosts the immune system and helps maintain regularity. Helps break down carbs without producing excess gas. May help to prevent or minimize various allergies or allergic reactions, inflammation associated with Crohn’s disease, or colitis.May have positive impact on cholesterol levels.

Lowers the pH of the intestine/vagina to inhibit the growth of harmful bacteria.

Recent studies have also shown this strain to be beneficial in supporting a balanced mood and healthy management of stress and anxiety.


Lactobacillus acidophilus

Most commonly used probiotic.Lives in the mouth, intestines (maintains integrity of the wall of the small intestine, aiding nutrient absorption and supporting immunity) and vagina (adheres to the walls of the vagina and urinary system where it can fight infection). Helps to synthesize vitamin K and many antimicrobial substances, giving it antibiotic properties.


Lactobacillus rhamnosus GG

One of the most effective strains for combating antibiotic-associated diarrhea and traveler’s diarrhea. Lives in the intestines, and fights infections both in the gut and urinary tract. Assists in dairy digestion and lactose intolerance.

Lactobacillus plantarum 299V

Reduces pain, bloating and improves constipation in Irritable Bowel Syndrome. Helps with antibiotic-associated diarrhea.

Saccharomyces boulardii

A probiotic yeast resistant to stomach acids and antibiotics. Effective against reducing acute diarrhea in children and adults. Protects against both antibiotic and travelers’ induced diarrhea. Promotes immune and digestive health.

Bifidobacterium infantis

Excellent for both children and adults, B. infantis is one of the first colonize in the newborn’s digestive tract. Helps to impede the growth of harmful bacteria.Excellent producer of B vitamins. Offers good results with IBS (bloating, gas, diarrhea, constipation, urgency and abdominal discomfort), IBD, ulcerative colitis and traveler’s diarrhea.

Lactobacillus casei





Helps control diarrhea, has potential anti-inflammatory effects on the GI and aids in relieving antibiotic-associated diarrhea. Produces lactic acid to lower the pH of the gut, impeding the growth of harmful bacteria. Lives in the mouth and intestines of both infants and adults.

Lactobacillus reuteri



Provides strong protection against infection and helps maintain a healthy immune system. Treats and prevents diarrhea. Helps relieve colic. Releases a substance capable of killing bacteria, yeast and fungi, making it popular for vaginal infection support against candida, UTIs.


Streptococcus thermophilus


One of the most useful strains in the commercial food industry. True starter strain for making yogurt (used in making cheeses too). Ferments milk sugar (lactose) that turns into lactic acid, which is effective at preventing lactose intolerance and also lowers the pH of the yogurt preventing the growth of harmful bacteria causing food poisoning. Keeps microflora of intestines balanced.May have benefits for chemotherapy patients.

Bifidobacterium breve

Unique in its ability to compete against harmful bacteria due to the large variety of molecules it can digest (including plant fibers otherwise thought non-digestible). Inhibits E. coli. Present in the intestines and the vagina (inhibits growth of candida albicans, the primary cause of yeast infections). Decreases occurrence of gas, diarrhea and bowel irritations.

Lactobacillus helveticus

Exerts antimicrobial activities against pathogens, helps reduce symptoms of lactose intolerance by breaking down lactose, helps to prevent and reduce diarrhea, may have implications on lowering cholesterol and blood pressure as well as help with calcium absorption. Recent studies have also shown this strain to be beneficial in supporting a balanced mood and healthy management of stress and anxiety. Lives in the intestines.

Bifidobacterium bifidum

Predominantly live in the large intestine and vagina, and adhere themselves to the walls of each, thus preventing bad bacteria from colonizing. B. Bifidum also produces substances that lower the pH of their environment so bad bacteria cannot thrive, and enhances assimilation of minerals.

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