Ingredient
Benzoyl Peroxide
What is Benzoyl Peroxide?
Benzoyl Peroxide is an organic compound with powerful antibacterial properties. It is commonly available in the form of creams, gels, and face washes, primarily used in skincare products.
Its primary use is to treat acne by reducing the amount of acne-causing bacteria and by causing the skin to dry and peel. Health evidence indicates Benzoyl Peroxide can be effective; however, it may also cause skin irritation and dryness.
When you see Benzoyl Peroxide listed on a product label, it's important to note that it is a controlled concentration, typically ranging from 2.5% to 10%, to minimize irritation while maximizing efficacy.
Commonly found in: acne treatment products, facial cleansers, spot treatments, skincare gels, anti-acne lotions
What to watch
- Can cause skin irritation and dryness.
- May bleach hair and clothing upon contact.
Benefits
- Effective in reducing acne-causing bacteria.
- Helps in the treatment of mild to moderate acne.
FDA has approved Benzoyl Peroxide for acne treatment but advises users to follow specific concentration guidelines to avoid adverse effects.
Research shows Benzoyl Peroxide is effective for acne treatment, yet it may cause skin irritation and other side effects in some individuals.
Benzoyl Peroxide is synthetic and generally considered vegan-friendly as it does not contain animal-derived ingredients.
Sources: FDA Benzoyl Peroxide Monograph · Benzoyl Peroxide and Skin Research
Scout's take
Highest BPO concentration in the Proactiv line. BPO is inherently unstable and spontaneously degrades into benzene via free-radical pathways, especially under heat.
More from Scout's analyses
Benzoyl Peroxide at 5.5 percent is the active acne-fighting ingredient. Unlike the rinse-off CeraVe products, this is a leave-on facial cream — meaning the benzene contamination has prolonged contact with skin. BPO spontaneously decomposes into benzene, particularly at warmer temperatures, and Effaclar Duo produced the highest documented benzene levels in Valisure's testing.
from the analysis of La Roche-Posay Effaclar Duo (5.5% Benzoyl Peroxide)FDA-approved acne active in two of the three kit products (rinse-off Cleanser + leave-on Treatment). BPO spontaneously degrades into benzene via free-radical pathways, especially under heat.
from the analysis of Proactiv 3-Step Convenience Pak (2.5% Benzoyl Peroxide)Found in 4 products
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