Ingredient Guides
Ingredient Safety Guides for Beauty Professionals
Professional reference articles on the ingredients that matter most in salon and spa settings — what they are, why they're flagged, and how to identify them on product labels.
Retinol & Retinoids: What Beauty Professionals Need to Know
Tretinoin, retinol, adapalene, and retinaldehyde — how they work, why they're contraindicated before waxing, chemical peels, and laser, and how to identify them on product labels.
PPD in Hair Dye: What Every Stylist Needs to Know
Para-phenylenediamine is the #1 cause of severe allergic reactions in hair salons. Cross-reactive compounds, INCI identification, patch test protocols, and PPD-free alternatives.
Formaldehyde & Formaldehyde Releasers in Beauty Products
DMDM hydantoin, Quaternium-15, glyoxylic acid, methylene glycol — the full list of formaldehyde-releasing preservatives in nail, hair, and skincare products, with occupational risk context.
MMA in Nail Salons: Risks, State Bans & the EMA Difference
Methyl methacrylate is banned in 30+ US states. Why it's dangerous, how to identify products that may contain it, and why EMA is the professional-standard alternative.
Fragrance Allergens: The 26 EU-Regulated Compounds & Beyond
Fragrance is the leading cause of contact dermatitis from cosmetics. The complete list of EU-mandated disclosure allergens, highest-risk services, and why 'natural' fragrance isn't automatically safe.
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