What is Acnecide 5% w/w Gel? Acnecide is a gel that helps to treat acne by attacking the bacteria that causes the condition, helping to keep skin clear. It works to reduce the effects of acne and allow the skin to return to its natural, smooth state, so you can feel confident in your skin. Acnecide contains the active ingredient benzoyl peroxide which attacks the bacteria (germs) known as Propionibacterium acnes, one of the main causes of acne. What is Acne? Acne appears as blackheads and whiteheads which people often refer to as pimples or spots. Acne of the face, chest or back may be treated with Acnecide 5% w/w Gel.. Key features of Acnecide 5% w/w Gel: Acnecide 5% Gel helps to reduce the effects of acne Active ingredient benzoyl peroxide Allows the skin to return to its natural, smooth state Attacks the bacteria (germs) known as Propionibacterium acnes. Please note that results may vary.