there is a protein treatment by Aphogee (available at sally's, and with tons ad tons and tones of reviews/videos/ pictures on folica.com) that works nicely. It's 3 steps.
1. shampoo.
2. the treatment. Beware; this stuff is NASTY! It's yellowish brown and watery and smells rank as all hell. I gag a little when i use it. Anyway, you put it all over your hair, then pin it up, and blowdry it. It will get hard as a rock. Do not touch it once its hardend because while in this state you could snap off some of the hair. I think you need to leave it for a bit then rinse it off.
3. Condition. Use their conditioner.
You can only do this treatment every 6 weeks cause its so strong.
I know it sounds scary, but if you follow the instructions it yields very good results. My hair was very unhealthy before i started on it, and its gotten a lot better.
They also have a 2 minute Keratine Treatment that i use in the shower. I use it like a conditioner. A lot of people swear by this alone.
If that is too much for you, you can try Onjon restorative treatment. It's pricier than Aphogee, but its very highly rated. Im still trying to figure it out. I got it as gratis last week, but all the girls i work with go nuts for it.
It smells very earthy, and is a more solid cream and comes in a pot. scoop it out (only a tiny bit) rub it between your palms until it becomes an oil and apply it through damp hair. It says dry hair on the package, but a lot of people have trouble getting it out of the dry hair.
One last treatment/line i can suggest for very very dry hair is Moroccan Oil.
I use the intense conditioner in the tub (i think thats what its call?) It smells SO good. I apply this on damp hair and leave on for 20 mins to an hour. When i was it off my hair smells fantastic and is hydrated and smooth for a while. I use it once a week.
also, if your blow dry your hair, or ever find its crunchy try the moroccan oil. Its an oil with the same smell as the cream. I put it through my hair before i blow dry. It cuts the blowdrying time in half and leave my hair feeling fantastic! If you find your tips feel crunch take a teeny bit, rub through your hands and run over the ends. They'll feel so nice after. In fact i think moroccan oil makes a few products for curly hair!