Everyone in my family is very introverted, independent and solitary, including me, but when I take zinc and vitamin D, I have a very noticeable increase in my interest in other people. I seek out human interaction, I have much more interest in the opposite gender, I feel inclined to do my hair and makeup and dress nicely, I wave at children and stop to pet other peoples' dogs. In short, I become a much more personable person. When not on zinc and vit D, I'm 3000% more introverted and avoid people and social interactions. It's a very stark contrast for me.
There is a peptide hormone called vasopressin that is nearly a twin to oxytocin, so I don't know how much of this response is due to oxytocin and how much is due to vasopressin. For example, vasopressin prevents nocturia, allowing people to sleep through the night without needing to empty their bladder. I used to get up 2-6 times per night to go to the bathroom, and now I can finally sleep through the night.
I think it's extremely likely that increasing oxytocin will also increase vasopressin. And perhaps, I'm accidentally improving pituitary function or something?
I don't think oxytocin will be magical by itself, but my approach to conquering this illness has been to seek out nutrient deficiencies and fix them, and there is clearly something oxytocin- or pituitary-related that needs to be fixed for me. (I've had extremely poor appetite and low food intake since I was a toddler; my earliest life memory is telling my mother that I didn't want to eat. So there a lot of things that have helped me that may not be helpful to a better nourished person.)