Probiotics help maintain a healthy gut for optimal nutrient absorption and health.
Our Runner Multivitamin contains up to 8 strains of "good" bacteria to replenish and revive your gut.
Recommended Daily Value & Upper Limit: Daily
FUNCTION IN RUNNERS:
A healthy digestion system is required from optimal nutrient absorption, digestion, and immunity - important for everyone, especially everyday runners. Probiotics can help balance "good" and "bad" bacteria to keep your body working as it should. Probiotics help replenish "good" bacteria that the body loses from antibiotics, diet, and stress. 
Both lactobacilli and bifidobacteria are normal inhabitants of the healthy intestine. The metabolic end products of their growth are organic acids (lactic and acetic acids) that tend to lower the pH of the intestinal contents, creating conditions less desirable for harmful bacteria. 
Why matters for Runners:
Compared to others, everyday runners are more reliant on maximum nutrient absorption from the food they eat to operate at peak performance. Probiotics helps maintain the balance of "good" and "bad" bacteria to keep the gut operating well.
Additionally, running, especially strenuous workouts, cause the cells lining the intestinal wall to pull apart, resulting in gastrointestinal distress (GI Distress) as substances leak into the bloodstream. Probiotics keep the gut cells together, which strengthens the intestinal wall. 
Our Runner Multivitamin:
Our Runner Multivitamin is scientifically formulated with up to 8 bacterial strains to replenish and revive healthy bacteria in the gut.
Probiotics are live microorganisms often sold as foods (such as yogurt) and dietary supplements. The concept behind probiotics was introduced in the early 20th century, when Nobel laureate Elie Metchnikoff, known as the “father of probiotics,” proposed that consuming beneficial microorganisms could improve people’s health. Researchers continued to investigate this idea, and the term “probiotics”—meaning “for life”—eventually came into use. Probiotics may contain a variety of microorganisms. The most common are bacteria that belong to groups called Lactobacillus and Bifidobacterium. Each of these two broad groups includes many types of bacteria. Other bacteria may also be used as probiotics, and so may yeasts such as Saccharomyces boulardii. 
HOW IT WORKS:
The microbes present in the gastrointestinal tract have the potential to act in a positive, negative or neutral manner. Due to unfavorable conditions, microbes are not very prevalent in the stomach or upper small intestine. However, toward the lower small intestine and entire large intestine, they begin to attain higher populations.
Both lactobacilli and bifidobacteria are normal inhabitants of the healthy intestine. Although they are not the dominant genera in either the small or large intestine of adults (bifidobacteria are generally the dominant flora of breast-fed infants), they are non-pathogenic and their presence is correlated with many measures of health. The metabolic end products of their growth are organic acids (lactic and acetic acids) that tend to lower the pH of the intestinal contents, creating conditions less desirable for harmful bacteria.
The gastrointestinal tract also serves to bridge the gap between “inside the body” and “outside the body”. Along this interface, microbes and foreign antigens colonizing or passing through the GI tract interact with important components of the immune system. This interaction serves to prime or stimulate the immune system for optimal functioning. Normal microbial inhabitants of the GI tract also reinforce the barrier function of the intestinal lining, decreasing passage of bacteria or antigens from the intestine into the blood stream. 
Best wishes chasing your running goals!
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 DiLonardo, Mary Jo. (2015, December). WebMD. What are Probiotics? Retrieved May 28, 2017 from: http://www.webmd.com/digestive-disorders/features/what-are-probiotics#1
 Bastone, Kelly. (2013, September). How Probiotics Can Help You Be a Better Runner. http://www.runnersworld.com/nutrition/how-probiotics-can-help-you-be-a-better-runner
 National Institutes of Health (2016, January). Probiotics: In Depth. Retrieved May 28, 2017 from: https://nccih.nih.gov/health/probiotics/introduction.htm
 US Probiotics. org (2011). Probiotic Basics. Retrieved May 28, 2017 from: http://cdrf.org/home/checkoff-investments/usprobiotics/probiotics-basics/
Disclaimer: These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. The information contained herein is for informational purposes only and does not establish a doctor-patient relationship. Please be sure to consult your physician before taking this or any other product. Consult your physician for any health problems.