I haven't lost any curl with the keratin conditioner. I think several people have noted that the keratin is helping to better define their curls (I was wary of the same thing). I have tried the argan oil conditioner also and got similar results. I have been using the keratin formula on its own and using the argan oil formula the same way I used GFTN- to add extra slip to my protein heavy ROs like Effective Care and CHS Pure Silk Protein.

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3a/f/iii
Modified CG since 11/5/11
CLEANSE: VO5 Vanilla Mint Tea Clarifying, DevaCare No-Poo, CHS Treatment Shampoo
RO: DevaCare One Condition, SS Caitlin's Conditioner, Mop Top Daily Conditioner
LI: SS Repairing Protein Treatment, CHS Silk Leave-In
STYLE: Re:Coil, Curl Keeper, Deva Ultra Defining Gel, Curls Rock Amplifier and Strong Hold Mousse, Sweet Curls Elixirs Okra Gel and Hard Hold Gel, SS Curl Enhancing Jelly and Firm Hold Gel