Encyclopedia

Skincare ingredients, explained from the evidence

These entries come from the same database that powers GlowOS healthiness scores: 10 of the 600+ ingredients we've researched, each grounded in regulatory and published sources. More entries are published as they're reviewed.

• Fragrance Notable concern — Fragrance — leading cause of cosmetic contact allergy; hidden mixture of chemicals
• Glycolic Acid Notable concern — EU concentration-restricted exfoliant (max 10%, pH ≥3.5)
• Sodium Lauryl Sulfate Moderate concern — Potentially irritating cleansing agent; safe as used.
• Titanium Dioxide Moderate concern — Broad-spectrum mineral UV filter — safe on skin; avoid inhaled forms (sprays/powders)
• Retinol Low concern — EU concentration-restricted (recent)
• Salicylic Acid Low concern — EU concentration-restricted
• Phenoxyethanol Low concern — EU-restricted (≤1%)
• Niacinamide No known concerns — Well-tolerated active
• Hyaluronic Acid No known concerns — Humectant
• Glycerin No known concerns — Humectant

GlowOS describes what regulatory bodies and published research say about an ingredient — it does not tell you what to use or avoid, and none of this is medical advice. Concentration, formulation, and your own skin all matter. For skin conditions, see a dermatologist.