Ingredient caution: vitamin C/ascorbic derivatives might cause tingling, redness or irritation in sensitive skin; niacinamide is usually gentle but might cause tingling or flushing in very reactive skin; alpha arbutin might cause tingling, dryness or redness in sensitive skin; fragrance, essential oils or fragrance allergens might trigger redness, itching or allergic irritation. 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. Start slowly if your skin is sensitive and avoid combining too many new actives at once. First-time users should start 3–4 times a week and pair with sunscreen, because pigmentation care works best with UV protection. Avoid this product if you have fragrance allergy, eczema-prone skin or a damaged barrier. Stop use if irritation persists.