Liver. High gamma GT levels in liver function tests rest clear. I have never drank alcohol. All scans clear, had lead poison as a child. Low ferrittin too

Probably just you. About 1 person in 1000 has an autosomal dominant tendency to a high ggt. These people get accused wrongly of being closet drinkers. It's really unfortunate and i'm sorry this happened to you. I trust you're not on any medications that might be doing this.