I'm still new here so please forgive me, but what does HG mean? My shampoo I'm loving right now is Redken Extreme. I normally switch around looking for something better, but I think this might be the best. My husband got it for me $50.00 for the shampoo & conditioner 1 liter. I guess I better like it after him paying so much for it. Has anyone else used this if so do you like it? I've been using it for 2 days.