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Auntie Ethel's Hair
(sh.itjust.works)
Baldur’s Gate 3 is a story-rich, party-based RPG set in the universe of Dungeons & Dragons, where your choices shape a tale of fellowship and betrayal, survival and sacrifice, and the lure of absolute power. (Website)
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Thank you!
The buff persists across stat increases.
You don't see it in the level-up-screen, but it's applied afterwards.
It's easy to test:
Make a save, Withers, eat the hair, level up.
Great to know, thanks! The hag dies tomorrow as scheduled!
Or, rather, almost dies, but yeah.