Honey

Honey is primarily a humectant/emollient used from low percentages to much higher levels in masks, and while it’s generally well-tolerated, it is a complex natural mixture that can contain pollen/propolis-related impurities and trace proteins capable of triggering irritation or allergic contact reactions in a minority of users. In sensitive or eczematous skin, its sugar-rich, slightly acidic nature and potential contaminants can sting on compromised barriers, so it is not reliably “exceptionally gentle” across high-risk populations. Safety Notes: In mass-market formulations, honey is often used at very low levels (≈0.05–1%) primarily for marketing/label appeal and mild humectancy in cleansers, lotions, and shampoos, with higher functional use commonly in the 1–10% range for leave-on masks and moisturizers. Consumer-available wash-off masks and “honey pack” products frequently use 10–50% honey for sensorial/occlusive benefits, and some OTC products are essentially pure honey (≈95–100%) marketed for skin use (including manuka/raw honey jars used topically). The practical upper end is limited mostly by stickiness, crystallization, microbial management (water activity varies with dilution), and allergen/fragrance considerations rather than specific cosmetic regulatory caps.