Mild gas and loose stools after starting a high-dose probiotic (50 billion CFU) is very common â it's the gut adjusting to the new strains. It usually settles in 2â3 days. VSL#3 is a well-studied probiotic; switching to a lesser-known brand with 20 strains can sometimes cause this reaction.
Next Steps
Stay hydrated, continue for 3â4 more days to see if it settles. If discomfort continues, go back to VSL or try a lower CFU count to begin with. Homemade curd daily is also a good natural option. Consult me on Practo if symptoms worsen.