Keratin treatments are sweeping the country, making curly and frizzy-haired girls' grooming routines infinitely easier. But the one possible drawback to these treatments (aside from the price) is that most hair products can no longer be used afterward, as they contain an ingredient that can break down the keratin -- and the results you just paid a pretty penny for.

"Sodium chloride is the main culprit; products that contain this ingredient cannot be used after a Keratin treatment or Brazilian blowout," explains Michael Shaun, Global Creative Director for Alterna. The ingredient (better known as salt) should be avoided.

In order to make it easy for you, we've compiled a list of sodium chloride-free hair products that are safe to use post-keratin. Always double-check the labels to make sure formulas haven't changed.

L'Oreal Paris EverPure Sulfate-Free Color Care
This drugstore option is an affordable staple for keratin care. Website

Alterna
According to the company, all of Alterna's products are free of sulfates and sodium chloride, making them a great all-around choice after any hair treatment. Website

Rusk Deepshine Smooth Keratin Care
This sodium chloride-free line is formulated specially for use after keratin treatments, but any hair type can benefit from the color-safe marine mineral-enriched formula. Website

Pureology
This sulfate and sodium chloride-free line of shampoos and conditioners has many options to cater to any hair need. Website

Brazilian Blowout
The manufacturer of the Brazilian Blowout solution also has a line of after-care products for treated hair. Website

Cutler Cleansing Conditioner
Following in the footsteps of the pioneer of cleansing conditioner, Chaz Dean, this new product is free of sodium chloride and sulfates. Website

Keratin Complex
The maker of the popular Coppola salon keratin treatment has a line of aftercare products as well. Website

Kim Vo
This LA-based hair colorist's shampoos are sulfate and sodium chloride-free. Website

Living Proof
According to the company, no sodium chloride is added into the products, which cater to specific hair needs like plumping fine hair or smoothing frizzy hair. Website

Hair Rules
This brand's suds-free shampoo contains no sulfates or sodium chloride. Website

Frederick Fekkai Au Naturel Gentle Shampoo
While others in the line are not necessarily keratin-safe, this Fekkai shampoo can be used after the treatment. Website

More on keratin:
Our reader reviews her keratin treatment
The Brazilian Blowout, explained