It doesn't claim to prolong color or even change the haircolor. L'Oreal makes the ColorVIVE line just for colored hair with 45% longer lasting color results. Leave-in conditioners can also help you hold on to your brunette.
Brilliant Brunette is actually a marketing ploy on another conditioner formula by John Frieda.
Since it doesn't change the hair color, they can call it whatever they want (i.e. Ravishing Redhead, Sheer Blonde, Brilliant Brunette, Take a Pill and Call Me in the Morning....)
BUT this is not a rant about it, I like the smell and the shine it adds. So you can give it a try.
John Frieda is my favorite haircare line. Everything they make smells incredible. If you want color retention, then get Loreal ColorVIVE and a leave in spray conditioner.
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