Culturelle is a probiotic supplement used primarily to prevent and manage diarrhea, support everyday digestive comfort, and help maintain a healthy balance of gut bacteria. Its active ingredient is Lactobacillus rhamnosus GG (often called LGG), one of the most studied probiotic strains in the world. LGG is a bacterium that naturally lives in the human intestine, where it helps crowd out harmful bacteria in the stomach and gut.
Preventing Antibiotic-Associated Diarrhea
One of the most common reasons people reach for Culturelle is to protect their digestive system while taking antibiotics. Antibiotics kill the bacteria causing an infection, but they also wipe out beneficial gut bacteria in the process. That disruption often leads to loose stools or outright diarrhea.
A meta-analysis of 11 randomized controlled trials found that LGG cut the rate of antibiotic-associated diarrhea roughly in half, from about 22% in people who took no probiotic down to about 12% in those who did. The effect was especially strong in children: among pediatric patients, the diarrhea rate dropped from 23% to under 10%. If you’ve been prescribed a course of antibiotics and you’re prone to stomach trouble, taking Culturelle alongside (but a few hours apart from) your medication is one of its best-supported uses.
Traveler’s Diarrhea
Culturelle is also marketed as a travel companion for people heading to regions where food and waterborne illness is common. A study of U.S. tourists visiting developing countries found that taking LGG daily offered a 47% protection rate against traveler’s diarrhea. That’s lower than the protection offered by prescription antibiotics (around 90%) or bismuth subsalicylate (about 65%), but it comes with fewer side effects and doesn’t contribute to antibiotic resistance. For travelers who want an extra layer of protection on top of safe food and water practices, it’s a reasonable option.
Everyday Digestive Comfort
Beyond diarrhea prevention, many people use Culturelle daily for general digestive health. The idea is straightforward: by consistently replenishing beneficial bacteria in the gut, you help maintain the microbial balance that supports normal digestion. People dealing with occasional bloating, gas, or irregular bowel habits are the typical audience for Culturelle’s daily digestive health formula.
There is also evidence that LGG may help manage symptoms of irritable bowel syndrome (IBS), including abdominal discomfort and unpredictable stool patterns. It has been studied in ulcerative colitis as well, where it may play a supportive role alongside standard treatment. These uses carry a “possibly effective” rating rather than a definitive one, meaning the evidence is promising but not conclusive.
Pediatric and Infant Uses
Culturelle makes formulations specifically designed for babies and children, and the LGG strain has some of its strongest evidence in younger populations. In infants, LGG has been studied as a treatment for colic, the prolonged, unexplained crying that peaks around six weeks of age. It has also shown benefit in treating or preventing diarrhea caused by rotavirus, one of the most common childhood stomach bugs.
For older kids, parents often turn to Culturelle during antibiotic courses or when their child is frequently picking up stomach bugs at daycare or school. The strain has clinical data supporting its use for community-acquired infectious diarrhea, functional abdominal pain, and even childhood eczema, though the strength of evidence varies across these conditions. Pediatric formulations come in packets, chewables, or drops depending on the child’s age.
Other Reported Uses
LGG has been explored for several conditions beyond the digestive tract. It is considered possibly effective for bacterial vaginal infections, where it may help restore the natural balance of protective bacteria. Some hospital settings use it to help prevent diarrhea in patients receiving chemotherapy or during extended hospital stays, where disruption to normal gut flora is common.
What Culturelle Won’t Do
Culturelle is classified as a dietary supplement, not a medication. The FDA does not evaluate probiotic supplements for the ability to treat or cure diseases, and the product label reflects that. While the LGG strain has more clinical research behind it than most probiotics on the market, many of its uses still fall into the “possibly effective” category. It works best as a supportive tool alongside other treatments or healthy habits, not as a standalone cure for chronic digestive conditions.
Most people tolerate Culturelle well. Mild gas or bloating in the first few days is the most commonly reported side effect and usually resolves on its own. People with severely weakened immune systems or those who have central venous catheters should be cautious with any live bacterial supplement, as there is a small theoretical risk of the bacteria entering the bloodstream in these populations.