you dont have to use all. but the eye cream and face cream work really well together. For the concerns you have these 2 products will improve each skin problem. A good cleanser not necessarily the same brand will help clean the skin so the creams are more effective penetrating into the deeper layers to achieve results!

Yes. It was orignally desinged to help with stretch marks.

The short answer is yes. But you should never go in the sun without sunscreen on anyway. And not just because of the risk of UVB rays causing sunburn or skin cancer (which 1 in 5 of us get). UVA rays are a major cause of aging of the skin! They cause the breakdown in the skin that leads to sagging and wrinkles. And using a good sunscreen while trying to combat past aging helps your anti-aging regimen work better while it protects you from future aging.

SPF only tells you how well your sunscreen protects against UVB rays (the burning and skin cancer-causing kind of rays), though. You need to look for one with a PA rating in order to know that it protects you from UVA rays. You want one of at least a rating of PA++ or PA+++. That added to Strivectin should help you see better and faster results than if you go out in the sun without a good sunscreen.

My skin has always been extremely sensitive and I love using Strivectin. I have never had any negative reaction to it.

not really a single face cream StriVectin SD Intensive Concentrate for Stretch Marks and Wrinkles is sufficient for the face and even the neck. I would only use that together with the eye cream. no need to over do it. the face cream works wonders just on its own,

Absolutely they can be used together. I have used Strivectin for 20 yrs now and always use it with other products. I would apply the Obagi 1st!