Multi-Strain Probiotic Mixture Affects Brain Morphology and Resting State Brain Function in Healthy Subjects: An RCT.

Serotonin in serum was not significantly ( p = 0.081) affected, but showed a trend towards a higher baseline-corrected concentration after probiotic intervention (median of −4.0 μg/L (IQR −21.5 to 19.5)) compared to after placebo (median of −20.0 μg/L (IQR −35.0 to −0.5)) ( Figure 3 D).

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