Topical vitamin C not necessarily effective?

I was at a lecture recently where a (board-certified) dermatologist spoke about skin cancer and ways to help prevent it and treatments and such, and she did touch on skin rejuvenation. I was really surprised when she said that topical vitamin c is ‘not stable’ so that no one really knows for sure if it makes a difference on the face as there are so many claims about it. She said that the retinoids are supposed to be much more effective such as retin-a. Anyone else hear about topical vitamin c? I found it to be very interesting, and I was really glad that I attended the talk Thanks!

I use vitamin c serum every night because I’ve read several times of it’s healing qualities. I have acne scarring in several places. I really like it. I use it as a night cream, and it seems to be working. I don’t like using creams or lotions. They have too many additives that don’t need to be on your skin, like oil or fragrance. The kind I use now, I got at Sally. I can’t remember the name, but it smells like straight oranges! I love it.