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i have both at the moment and you can't even compare these two in my opinion. the l'oreal is the best serum i have ever used. i think i'm on my third or fourth bottle, and the fantasia just sits in my bathroom. maybe the fantasia fights frizz also but it does not detangle at all. and the l'oreal is a detangler and frizz fighting serum in once.
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I haven't tried the l'oreal yet, but I will eventually. For me, fantasia detangles beautifully. I don't know about the frizz factor because my hair hasn't been straight in ages.