Ive always had super long hair that was dry an straw-like for years. A few months ago I got fed up with it and EEK! cut it to my shoulders! But since then my hair has been healthy, soft, silky and I love it! I guess it was better for me to just cut off all the damage then to hopelessly try to make it better.
I would concentrate on the shampoo not the conditioner!
I swear by DevaPoo no lather shampoo. It takes a little getting used to because it has absolutely no suds but after using it for the last year and a half, my hair is transformed.
After that...any good thick deep conditioner will do.
I have very thick long curly hair and I use coconut oil and almond oil ( whole foods) to condition my hair. After I dry my hair I put a small amounts of almond oil in my hair. I have tried every product and these are cheaper and natural.