Probiotics are live microorganisms that, when taken in adequate amounts, provide a health benefit. You can get them from fermented foods such as yogurt, kefir and sauerkraut, or from supplements. Research on them has grown fast, and some benefits now rest on solid evidence while others are still early. Here are the seven best supported, with an honest note on how strong the evidence is for each.
What are the digestive benefits of probiotics?
1. Less risk of diarrhea when you take antibiotics
This is one of the best-established uses. A 2021 review of 42 trials in more than 11,000 adults found that taking probiotics alongside antibiotics reduced the risk of antibiotic-associated diarrhea by 37%, with moderate-quality evidence. Read how to support your gut after antibiotics.
2. More regular bowel movements
In adults with functional constipation, probiotics increased stool frequency by about 1.3 bowel movements a week and improved stool consistency, with Bifidobacterium lactis showing the most consistent effect.
3. Support for occasional bloating and digestive comfort
Bloating is one of the most common reasons people try a probiotic. For people with irritable bowel syndrome, where bloating is a frequent complaint, a 2026 analysis of 40 trials found probiotics improved overall IBS symptom scores, though the certainty of the evidence was low. For everyday digestive comfort, Trust Your Gut is formulated to help support occasional bloating. Talk to your doctor if you have ongoing symptoms.
4. Easier lactose digestion
Many probiotic bacteria can break down lactose themselves. A systematic review of 15 randomized trials found an overall positive relationship between probiotics and lactose intolerance symptoms. More in The Deal with Dairy.
Do probiotics support the immune system?
5. Fewer and shorter colds
A 2022 Cochrane review found that probiotics may reduce the number of people who get upper respiratory infections by about a quarter and shorten episodes by about a day, and likely reduce antibiotic use for them. The certainty was low to moderate. Read more in Probiotics for Immunity.
What are the benefits of probiotics beyond the gut?
6. Support for mood
Through the gut-brain axis, your gut bacteria and brain influence each other. In a meta-analysis of 34 controlled trials, probiotics had small but significant effects on depression and anxiety, with larger effects in clinical groups. Think of probiotics as a possible addition to care, not a substitute. See Can Probiotics Improve Your Mood?
7. Help maintaining healthy cholesterol levels
In people with cardiometabolic risk factors, a meta-analysis of 40 trials found probiotic and synbiotic supplements lowered LDL cholesterol by about 5 mg/dL and triglycerides by about 12 mg/dL. That is modest, and works best alongside diet and exercise.
What probiotics will not do
Some popular claims go further than the evidence. In people with overweight or obesity, probiotics produced only a small reduction in body weight, about 0.6 kg, and no significant change in fat mass compared with placebo, so they are not a weight-loss tool. Claims that probiotics treat acne or protect skin from sun damage also rest on early research rather than solid evidence.
How to get started safely
Benefits are strain-specific, so choose a product with named, studied strains and take it consistently with food. Trust Your Gut Probiotic + Prebiotic Daily Essential provides 16 billion CFU from 6 acid-resistant strains, plus organic prebiotics, in two capsules a day. Mild gas or bloating in the first days is common. If you are immunocompromised, seriously ill or pregnant, talk to your doctor first, since the risk of harmful effects is greater in people with severe illnesses or compromised immune systems.
