Wonderful product
I purchased this Catalase Extreme shampoo a month ago and I noticed the changes in my hair within days. Because of my damaged irritated scalp and premature graying I have a lot of grays 50% even in my late 30s because of hydrogen peroxide build up. This shampoo is restoring years of tgis buildup so I can understand that it may take a couple of months for the full coverage. I’ve noticed my natural hair coming in that I hadn’t in years.