Depends on the ingredients of the one you're using.
I used to work at LUSH and we had a product called Big shampoo, which used mostly sea salt as the main ingredient. It works by raising the cuticles all along your hair shaft, which cause them to sort of push against each other, creating volume. You can actually see it working when you wash your arm hair with it, so I know that it works.
I honestly would not suggest it for naturally dry/curly hair, however. I think it's just far too drying and damaging, and this is a more natural product. I only recommended it for women with limp, oily, stick straight hair. I can only imagine what the more commercial products might do.
I would try a method like rollersetting or not flat ironing bone straight instead of a product, but that's just my opinion.