You can scrape out your own vanilla bean pods or buy vanilla bean paste. A little goes a long way. Yes it’s exfoliating. No mine doesn’t cause seizing or discolouring. No scent though.
For me vanilla bean is about as exfoliating as I want to go.
Cinnamon is beyond exfoliating for my sons - they hate the scratchiness.
Poppy seed would be way too exfoliating for our family.
I think it is a matter of trial and error and preference.