I've been using a small trial size of this, for the first time ever. Am in my early 50s. I'd like it to work and to be amazing, but if I can be honest, I'm not quite sure if it is having any effect. It is so hard to tell, and there are so many variables - eg, I use diff moisturisers so maybe they affect it too. What sort of changes should I be looking for or noticing? I don't want to spend the money on a full size bottle unless it is going to do something? The trouble is, I rarely find things make any lasting difference. They feel nice at the time of application. My skin is quite dry, but other than that, is quite good for my age. Any pointers appreciated, thank you.