This is more of a cosmetics question, but it’s something I’ve been curious about for a while and thought it couldn’t hurt to ask. Somebody might know the answer. I personally use a strange variety of products on my face, and I know from some threads here that others do too. However cosmetic sales ladies always tell you to buy every product in the same brand because they are made to work together. Do any of you use a face wash, lotion, foundation, powder etc. all by the same brand? Do you think it really makes a big difference? Or do they say that mostly because they want to sell them all to you? My biggest difficulty with using any whole face system is that most of them have lotions with only SPF 15, and with my fair skin I need at least SPF 30. So can I keep on using all of my separate products and still have healthy skin?