Also called beta hydroxy acid (BHA), this multifunctional ingredient addresses many of the systemic causes of acne. 
It has the ability to penetrate into the pore lining and exfoliate inside the pore as well as on the surface of skin, which makes it effective for reducing breakouts, including blackheads and whiteheads. [2, 3, 4]
- Hartmann A. The influence of various factors on the human resident skin flora. Semin Dermatol. 1990;9(4):305-8.
- Bowe W, Shalita A. Effective Over-the-Counter Acne Treatments. Semin Cutan Med Surg. 2008;27(3):170-176.
- Kornhauser A, Coelho S, Hearing V. Applications of hydroxy acids: classification; mechanisms; and photoactivity. Clin Cosmet Investig Dermatol. 2010;20(3):135-142.
- Harding C, Watkinson A, Rawlings A, Scott I. Dry skin, moisturization and corneodesmolysis. Int J Cosmet Sci. 2000;22(1):21-52.