Ingredient caution: retinol/retinoids might cause dryness, peeling, redness, purging and sun sensitivity; preservatives such as phenoxyethanol/benzyl alcohol might sting very sensitive or compromised skin; humectants such as hyaluronic acid/glycerin are usually gentle but might feel sticky or tight if not sealed with moisturiser. Do a patch test before applying. Retinol is not advised for pregnant or breastfeeding women unless approved by a doctor. First-time users should start 3–4 times a week at night, avoid layering with exfoliating acids, and use sunscreen daily. Do not apply on broken, freshly waxed or irritated skin. Apply on slightly damp skin and follow with moisturiser if dryness occurs. Stop use if irritation persists.