You don't really need this product if you have the other creams but if you want the added boost then it will help you. I didn't find it too necessary but it all comes down to preference. I did find that adding it on top of the other creams was tricky to apply but maybe it was just me. It seemed a bit too watery with the consistency compared the the creaminess of the day and night creams from the Purely Ageless range. I would rather use this product with out the creams in my opinion. Sukin is a wonderful brand and I would buy this serum again but I would use it differently than I have done.