[Deodorants and antiperspirants]

Area of Science:

• Cosmetic Science
• Dermatology
• Toxicology

Background:

• Deodorants and antiperspirants are often confused, though they utilize distinct active ingredients and mechanisms.
• Antiperspirants function as deodorants by preventing substrate decomposition but pose formulation challenges due to skin acidification from aluminum compounds.
• Concerns exist regarding the potential genotoxicity and breast cancer link with systemic aluminum, though topical absorption is considered low.

Purpose of the Study:

• To differentiate the mechanisms and potential risks associated with deodorants and antiperspirants.
• To highlight the chemical properties and formulation considerations for antiperspirants.
• To discuss the safety concerns and regulatory aspects of ingredients used in both product types.

Main Methods:

• Comparative analysis of active ingredients and their modes of action.
• Review of scientific literature on the toxicology and safety of aluminum, zirconium, antiseptics, and fragrances.
• Examination of formulation challenges and solutions for antiperspirants.

Main Results:

• Antiperspirants utilize aluminum chlorohydrate (ACH) or aluminum-zirconium complexes, causing skin acidification requiring emollients and pH regulators.
• Deodorants may contain antiseptics like triclosan, potentially inducing bacterial resistance.
• Axillary dermatitis is a risk with deodorants due to allergenic fragrances and essential oils.

Conclusions:

• Antiperspirants and deodorants have different safety profiles and formulation requirements.
• While topical aluminum absorption is low, concerns about systemic effects and zirconium toxicity persist.
• Fragrance allergies are a significant issue in deodorant-associated dermatitis.