Probiotics: What They Do and How to Use Them

Did you know your gut contains trillions of microbes that affect digestion, mood, and immunity? Probiotics are live bacteria and yeasts that can help balance that ecosystem. If you've seen shelves full of jars and felt lost, this page will help you pick the right product, use it correctly, and avoid common mistakes.

Probiotics aren't a miracle cure, but they work for specific problems. They can help with antibiotic-related diarrhea, some irritable bowel symptoms, and certain infections. Different strains do different things — Lactobacillus rhamnosus might ease diarrhea, while Bifidobacterium longum can support regularity. Match the strain to the problem.

How to pick a probiotic

Start with the goal. Are you replacing gut bacteria after antibiotics, easing bloating, or trying to boost general gut health? Look for products that list the exact strains (not just "proprietary blend") and give a colony-forming unit (CFU) count. For adults, a product with 1–10 billion CFU is common; some conditions need higher doses — follow label directions or ask a pharmacist.

Check the label for evidence. Brands that reference clinical studies for their specific strains are more reliable. Avoid products that promise unrealistic results or list dozens of strains without proof. Also note storage: some need refrigeration, others are shelf-stable. If it must be refrigerated, shipping in hot weather can kill the bacteria, so buy from trusted sellers.

Taking probiotics safely

Take probiotics as directed. Many work best on an empty stomach, but follow the product advice. If you're on antibiotics, take the probiotic a few hours after the antibiotic dose to reduce the chance the antibiotic kills the probiotic. Keep using the probiotic for a week or two after finishing antibiotics if your goal is to reduce diarrhea risk.

Side effects are usually mild: gas or bloating for a few days as your gut adjusts. Stop and talk to a doctor if you get persistent stomach pain, fever, or if you have a weakened immune system. People with serious illness, recent surgery, or central lines should always check with their clinician before starting live microbes.

Want a simple routine? Pick one evidence-backed product, take it consistently for 4–8 weeks, then reassess how you feel. Combine probiotics with a fiber-rich diet — prebiotics like oats, bananas, and garlic feed good bacteria and help them stick around.

If you have specific conditions like IBS, recurrent UTIs, or yeast infections, look up research on the strains used for those problems or ask your healthcare provider. Probiotics can help, but the right strain, dose, and duration matter most.