Psidium Guajava and Juglans regia for Acne

Title: The antimicrobial activities of Psidium guajava and Juglans regia leaf extracts to acne-developing organisms.
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 bacteria.

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.

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