Ingredient caution: vitamin C/ascorbic derivatives might cause tingling, redness or irritation in sensitive skin; fragrance, essential oils or fragrance allergens might trigger redness, itching or allergic irritation; UV filters might sting around the eyes or irritate very sensitive skin; preservatives such as phenoxyethanol/benzyl alcohol might sting very sensitive or compromised skin. Do a patch test before applying. First-time users should start 3–4 times a week and avoid layering with strong exfoliating acids if the skin stings. Avoid this product if you have fragrance allergy, eczema-prone skin or a damaged barrier. Patch test near the jawline first, avoid the eye corners, and remove gently at night. Do not apply on broken, freshly waxed or irritated skin. Stop use if irritation persists.