Psidium Guajava and Juglans regia for Acne
Title: The antimicrobial activities of Psidium
guajava and Juglans regia leaf extracts to acne-developing organisms.
Authors: Qadan F, et al.
Publication: Am J Chin Med. 2005;33(2):197-204.
The authors cultured acne-causing bacteria Propionibacterium
acnes (P. acnes) as well as Staphyloccocus aureus and epidermidis
from 38 acne patients. They then tested the effectiveness of extracts
of Psidium guajava and Juglans regia leaf in killing acne-causing
The authors found that these two extracts have significantly
better antimicrobial effects on the Staphyloccocus bacteria in
vitro (or in test-tube environments) as compared to tea tree oil,
as well as doxycycline and clindamycin antibiotics. However, it
has lower antimicrobial activities on P. acnes, as compared to
the chemical antibiotics.