Look for labels that guarantee the CFU count at the time of expiration , not "at the time of manufacture".

Health benefits are strain-specific. A generic Lactobacillus might not provide the same results as a clinically studied version like L. rhamnosus GG . 2. Check the CFU Guarantee

CFU (Colony Forming Units) tells you how many live bacteria are in a dose.

Buying probiotics online gives you access to a huge range of options, but it also requires a bit of detective work to ensure you’re getting a high-quality product that survives the trip to your door. 1. Look for the "Strain Name," Not Just the Genus