Probiotics may improve mood via gut–brain axis: Young, healthy adults who took probiotic daily for a month had reduced negative feelings (anxiety, stress, fatigue or depression) compared to placebo. It took about 2 weeks for probiotics to work, about the same time as antidepressants.

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3. Probiotics may improve mood via gut–brain axis: Young, healthy adults who took probiotic daily for a month had reduced negative feelings (anxiety, stress, fatigue or depression) compared to placebo. It took about 2 weeks for probiotics to work, about the same time as antidepressants.