Agree with the girls here, the olaplex one is good, or fanola but my god the fanola will strip ANY yellow from your hair. I love it, I have silver hair so it works for me. Just wear gloves when you use it and don’t let it drip down your face, and 100% hair mask after because it’s drying. Don’t use it too often or your hair will probably be ruined, I leave it on for ten mins once a month as a really good toner between hair appts. Recommend redken all soft or Philip Kingsley elasticizer masks once a week for keeping your hair healthy when using purple shampoos xx