Leaves Yes, Seeds No
Same plant, two very different parts. One goes in tea. The other was once used to poison fish.
Curie's third rule, same family as "know the lookalike": knowing the plant isn't enough — you have to know the right part too. Mullein's leaves and flowers make a gentle tea. Mullein's seeds contain rotenone, a real poison historically used to stun fish. Same plant, completely different jobs depending on which part you're holding.
About Cottage Core Curie
Went and got a real chemistry degree specifically because people kept waving off home-remedy knowledge as "just old wives' tales." She wanted the credentials to say the science was real without needing anyone's permission. Her apron does real work — tool loops, sample pockets, a stain she's stopped bothering to remove — and her mortar and pestle has a personality earned from genuine, decades-long use.