# How to Choose the Right Probiotic for Your Body
The probiotic aisle confuses most parents. Shelf-stable versus refrigerated. Ten billion CFUs versus fifty billion. With prebiotics or without. The choices feel endless, and marketing claims don't help.
Here's what matters: probiotics aren't one-size-fits-all. Your child's gut microbiome is unique to them, shaped by birth method, diet, antibiotic history, and genetics.
Start by understanding CFU counts. CFU stands for colony-forming units, the live bacteria measure. Higher numbers don't automatically mean better results. Research shows that 1 to 10 billion CFUs daily works for most children, though some benefit from higher doses depending on their specific condition.
Strain specificity matters more than total count. *Lactobacillus* and *Bifidobacterium* families dominate quality children's probiotics. Look for formulas listing specific strains, not just generic "probiotic blend." Different strains address different issues. *Lactobacillus rhamnosus* helps with diarrhea. *Bifidobacterium longum* supports constipation. Pediatrician input here helps tremendously.
Storage type signals viability. Shelf-stable probiotics use special encapsulation to survive room temperature. Refrigerated versions often maintain potency longer but require consistent cold storage, which matters if your child's preschool stores them improperly. Check expiration dates. Dead probiotics provide no benefit.
Prebiotics are optional fiber that feeds beneficial bacteria. Some children thrive with them. Others experience bloating. Start without prebiotics, then add if needed.
Third-party testing through NSF International or USP verification ensures the label matches the bottle's contents. Many untested brands inflate CFU