AVYA products are proven to be effective at renewing skin, thanks to ingredients like Vitamin A (retinoid) - one of the most powerful agents for skin turnover. If your skin is not used to retinoids, initial use of our serum and night cream may cause temporary redness, dryness, or flaking. This is completely normal! In fact, 15 percent of our clinical testing group experienced sensitivity that typically resolved in 2 weeks. Decreasing the frequency of use, using simple moisturizers, and even topical over-the-counter hydrocortisone can ease the transition. Of course, since skin sensitivity and skincare habits can vary from person to person, we recommend checking with your doctor if you have sensitivity. (Our response does not replace a face-to-face medical consultation with a doctor or personal medical advice).