lack of serotonin is present in depression. It also is a growth factor for some types of cells, which may give it a role in wound healing.

serotonin tattoo (= happiness/satisfaction)// to keep the chemical structure theme going, maybe? Try to find other chemical structures

I would probably get this somewhere else but I like the idea

Here are some of the best and creative 60 small and tiny tattoos design ideas for men and women for getting themselves inked. Top most beautiful small tattoo designs for women and men. This cool and cute tattoo ideas will make you feel amazing.

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