Check for strain IDs (not just species)
Studies are done at the strain level (letters/numbers after the species). Favor labels that list strain IDs and state CFU at the end of shelf life, not just “at manufacture.”
- ✅ Strain IDs listed (e.g., “GG,” “BB‑12”)
- ✅ CFU listed at end of shelf life
- ✅ Serving size and age directions are clear
- ✅ Storage instructions (refrigerate vs. shelf‑stable)