Yes, you can use this cream if you already use retinol or other vitamin A products, but you need to introduce it thoughtfully. The product information notes that if your skin is very sensitive, or if you already use other vitamin A products, you should watch how your skin responds. Retinyl palmitate is a gentler vitamin A derivative than some forms of retinol, but combining it with another vitamin A product can increase the chance of dryness, redness, or irritation.
The safest approach is not to layer two vitamin A products on the same area at the same time. For example, if you use a retinol serum on your face, you could use this cream on the décolleté, or alternate nights between products. Start by using this cream every other night or a few times a week, and observe your skin. If you see persistent irritation, reduce frequency or stop and consult a specialist.
Also avoid the eye area, and use daytime sun protection, because vitamin A derivatives can make skin more reactive to sunlight. If you are pregnant, breastfeeding, have a chronic skin condition, or are on medication, check with a specialist before using a vitamin A-containing cosmetic.