research Kajian Literatur : Uji Aktivitas Antibakteri Beberapa Ekstrak Terhadap Propioni-bacterium Acnes Penyebab Jerawat
This study found that red galangal rhizome simplicia extract demonstrated the strongest antibacterial effect against Propionibacterium acnes among tested extracts, achieving a 31.5 mm inhibitory zone at a 20% concentration.

