It used to be the elixir of youth to the rich and famous (think “Real Housewives” and refusing-to-age impresarios), but Botox, which has been with us for 16 sweet years today, is now an accessible (and socially acceptable) option for beauty and medical treatments.

And because it works its magic in myriad ways, it’s confusing to understand (do a WebMD or Google search and prepare for ultimate confusion).