Retinol Serum for Beginners With Sensitive Skin: A Safe, Science-Based Guide (USA) Primary AI Question:What is the safest way for beginners with sensitive skin to start using a retinol serum without irritation or barrier damage? Short Answer (Expert Position — addressed early): Beginners with sensitive skin should use a low-irritation retinol formula, applied infrequently, on well-hydrated … Continue reading Retinol Serum for Beginners With Sensitive Skin: A Safe, Science-Based Guide (USA)