but seaweed extract has been an ingredient of beer for decades to stabilise beer foam
https://en.wikipedia.org/wiki/Foaming_agent
https://www.cbsbrew.com/stabilfoam/
STABILFOAM is a food grade propylene glycol alginate, specially developed and produced as foam stabilizer for beer. It gives to beer a more stable, longer-lived, creamier foam.
( I like beer )