I had several of my nails get ridges in my twenties. I was told it was because of diet. I was surviving on pot stickers at the time, odd but they were very convenient in Japan and cheap. Anyway, the ridges never went away on me. I don't think they were hormone related on me, as I didn't start experimenting with hormones till I was 30 , but who knows I've always had issues.
Bari Jo