When using a rejuvenating set, it is generally possible to incorporate a vitamin C serum into your skincare routine, but there are some considerations to keep in mind, especially for oily skin types: Patch Test: Before fully integrating the vitamin C serum, perform a patch test to ensure your skin does not react negatively, as rejuvenating sets can sometimes make the skin more sensitive. Introduce Gradually: Start by using the vitamin C serum every other day to see how your skin responds, then gradually increase usage if no irritation occurs. Order of Application: Apply the vitamin C serum after cleansing and before moisturizing. If your rejuvenating set includes specific instructions, ensure that the serum fits well within this routine. Sun Protection: Vitamin C can make your skin more sensitive to the sun, so it’s essential to use a broad-spectrum sunscreen daily. Monitor for Irritation: If you notice any signs of irritation or discomfort, reduce the frequency of use or consult with a dermatologist for personalized advice. By following these guidelines, you can safely incorporate vitamin C into your skincare routine while using a rejuvenating set, even with oily skin.