I'm a natural, no texturizer. My hair album is pretty sucky (don't like taking pictures and have the world's cheapest digicam), but I get asked fairly often IRL "Is that a texturizer?" and "What do you put in it?" When I have to, I say my hair is 3b to 4a because I know it's SOMEWHERE in there. *g*
Anyway, the key to getting curls for me seems to change with length. When I first chopped and had about an inch of hair (stretched!), the key was minimal manipulation. A few months later, my hair looked best when I detangled it once in awhile using only my fingers and, once a week, went over it with a paddle brush. Now.... the curls look most defined when I detangle it about twice a week with a wide-toothed comb. It's been a learning experience, and as I gain more length, I'll have to keep adjusting.
The only thing that's never changed is the need to keep my hair moisturized and use a conditioner that works with my hair. My best bets are V05 "cream" conditioners and Herbal Essences. (My hair is very thick and coarse, so depending on the texture, your mileage may vary.)
My current daytime leave-in of choice, used after washing, is Neutrogena Triple Moisture. After that, I put in either Elasta QP Mango Butter or African Essence Crystal (silicone) Drops, whichever is handy, to seal in the moisture. I always use these things while my hair is damp.
At night, I mist my hair with water and put in some Profectiv Long 'N Healthy. I also like to do nightly scalp massages with unrefined coconut oil. So, basically, my hair is always moisturized.
Hope my rambling helps.
~Rochelle.