Lactobacillus reuteri increases Oxytocin

I was wondering why L.Reuteri causes significant improvement in the bonding behaviour, this seems to answer it:

“It was previously shown that feeding of a human commensal microbe Lactobacillus reuteri (L. reuteri) is sufficient to up-regulate endogenous oxytocin levels and improve wound healing capacity in mice.

Here we show that oral L. reuteri - induced skin wound repair benefits extend to human subjects.

Further, dietary supplementation with a sterile lysate of this microbe alone is sufficient to boost systemic oxytocin levels and improve wound repair capacity.”

I suspect there could be another bacteria that downregulates oxytocin synthesis (and probably by increasing methylation of the OXT gene).