Your body has to maintain a delicate balance of hormones at the right time, and when estrogen is at the optimal level, it has a calming effect on the brain. (mindbodygreen.com)
Tryptoplan is the precursor for serotonin which has a calming effect on the brain. (ketogenic-diet-resource.com)
Progesterone has a calming effect on the brain, whereas estrogen has an excitatory effect. (rachaelattard.com)