[rexpop]

It may not be as simple as "supplements," but there are probably dietary and habitual augmentations to bolster these neuro-physiological resources. Sleep is crucial for replenishing neurotransmitters. Exercise is crucial for establishing biorhythms necessary to sleep. We're all fairly malnourished, given the modern western diet is biased towards cheap calories. Copper. Zinc. Iron. Deficiencies in all of these can cause mental health issues. Then there's the notorious (tenuous?) connection between suicidality and gluten.

Anyway, you can do your own research but as for supplements to facilitate extroversion... B vitamins?