Thank you for your question. This can be used with a tretinoin or retinol cream! You will first apply your tretinoin or retinol, and then follow with the Even & Correct and then your moisturizer.

Thank you for your inquiry, if the SkinMedica Even & Correct Advanced Brightening Treatment Serum is used twice a day, it should roughly last 3-4 months give or take.

Thank you for your inquiry. The percentages of this ingredient is considered to be proprietary and is not available.

Hello. Thank you for your inquiry. You can use the TNS Advanced Serum in combination with the SkinMedica Even & Correct Advanced Brightening Treatment Serum. When applying your products, we recommend using the G.R.A.S.S. method. I will include this for you below. G- Growth Factors - SkinMedica TNS Advanced Serum R- Retinoids (PM only) A- Antioxidants S- Specialty serums/Treatments serums and moisturizer - SkinMedica Even & Correct Advanced Brightening Treatment Serum S- Sunscreen (AM only) We hope you find these recommendations helpful. Please let us know if you have any further questions or concerns.

It’s great to hear you loved the results from the SkinMedica Even & Correct Advanced Brightening Treatment Serum and want to incorporate it into your routine! Here’s how you can effectively layer this serum along with your tretinoin (vitamin A) and TNS Advanced+ Serum. Layering Routine: In the Evening: Cleanse: Start with a gentle cleanser to remove any makeup, dirt, and oil. Pat your skin dry with a soft towel. Tretinoin (Vitamin A): Apply your tretinoin first, as it’s the most active and potent treatment. Retinoids like tretinoin are best absorbed when applied directly to clean, dry skin. How to Apply: Use a small, pea-sized amount and apply a thin layer over your entire face (avoiding the eye area). Allow it to absorb fully for about 1–2 minutes before applying the next product. SkinMedica Even & Correct Serum: After allowing the tretinoin to absorb, you can apply the Even & Correct Advanced Brightening Treatment Serum. This serum contains ingredients to address pigmentation, brighten the skin, and help with dark spots. How to Apply: Use a few drops (usually 2–3) and apply evenly to your face, focusing on areas of hyperpigmentation. Massage gently until fully absorbed. TNS Advanced+ Serum: After the brightening serum has absorbed, apply the TNS Advanced+ Serum. This serum is rich in growth factors, peptides, and antioxidants, which help to improve overall skin health, texture, and reduce signs of aging. How to Apply: Use a small amount (a pea-sized amount is usually enough) and apply it evenly across your face and neck. Pat gently for better absorption. Moisturizer (if needed): If your skin feels dry after applying these treatments, finish with a hydrating moisturizer to lock in moisture and support your skin barrier. In the Morning: Cleanse: Start by washing your face with a gentle cleanser. TNS Advanced+ Serum: Apply TNS Advanced+ Serum after cleansing for its anti-aging and skin-repair benefits. You can layer this serum under your moisturizer and sunscreen. SkinMedica Even & Correct Serum: If you're also using this serum during the day, you can layer it after the TNS Advanced+ Serum. It will help brighten your complexion and even out skin tone. Note: Since the Even & Correct Serum contains ingredients that can make your skin more sensitive to the sun, always finish with a high SPF sunscreen (SPF 30 or higher). Moisturizer: Follow up with a lightweight moisturizer if needed.