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B. lactis (BB-12 / HN019) and L. casei Shirota can interact. For stool frequency specifically, B. lactis is the better-evidenced choice. No interaction between them. Listed for comparison rather than for stacking — no trial has combined them.
For stool frequency specifically, B. lactis is the better-evidenced choice. No interaction between them.
In the same 2022 constipation meta-analysis, B. lactis significantly increased stool frequency while L. casei Shirota specifically did not.
What to do: Listed for comparison rather than for stacking — no trial has combined them.
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.