I've had GA off and on for about 15 years now.... each time it comes back it's spread a bit more, to the point that I have it all up my legs and a bit on my arms and the backs of my hands. I've tried the apple cider thing - went through 3 bottles, drinking a couple of tablespoons in hot water and honey each morning religiously. It made no difference at all to the GA.
Most recently, I've been rubbing coconut oil on my skin, and after a few weeks, I'm seeing a definite difference.... The backs of my hands are getting better. I was afraid the scarred skin would not go away, but my hands look better than they have in a long time. The GA on my legs is more stubborn, but I'm seeing some improvement there too. It's hard to say for sure that it's the coconut oil that's doing it - the GA seems to come and go in waves over the years, so I can't say for sure that it's not just going into remission again. Also, I've been ingesting coconut oil everyday (on toast, popcorn, instead of other oil in frying eggs, etc....)
I hope this helps someone!