The only new skin care product that I've added to my Rx and drugstore(CeraVe and Cetaphil)products combo in the last 6 months or so is a Vitamin C serum that I can tolerate. In the past I had tried several, and either they irritated me or made me break out(and I'm NOT acne-prone whatsoever). I went with Timeless Skincare Hyaluronic serum with 5% Vitamin C to ease in - excellent starter product and very hydrating under my other stuff. I was on that for a little while, and then started working in CSI Youth Serum(12% Vitamin C in the form of L-ascorbic acid) until I was using that every morning under my other stuff. Another excellent product, and so reasonably-priced too - just a little over $16 at Vitacost, the online retailer where I get some of my supplements. CSI is their house brand. I had found out about it on MUA. The serum has just two ingredients - the C, and butylene glycol. At first I wasn't too sure about that latter ingredient, but my skin seems to be fine with it. The addition of a C serum to my whole routine I think is making a difference - my provider at Curology(used to be PocketDerm where I get my Rx)has totally approved of my whole routine and cautious approach. A lot of things have really faded on my face - even one very dark spot has started to fade and a bunch of others that weren't as dark are either noticeably lighter, or gone altogether. Very happy about that, as the spots were the thing really spoiling my skin which is otherwise pretty good for someone as old as I am.