whats a herb similar to πŸƒ?

basically my father has anxiety and the closest thing that has calmed him down has been πŸƒ but hes worried he’ll get a bad high and end up freaking himself out more, so im thinking a herb that could be used as tea, and is able to really mellow and calm someone down (maybe even helps lower blood pressure) but without any bad side effects and without it making the drinkee feel weird