Get sulfate shampoo in your eyes and it'll be irritating. However, it does far worse to your hair and skin.
Sulfates are common in a lot of cleaning products, especially in shampoo and conditioner. Sulfates are what causes the foaming action associated with soaps. Sodium lauryl sulfate is found shampoos and conditioners.
It's used more as a foaming agent to emulsify grease, dispersing it into water so that it can be washed away. Shampoo tends to contain a concentration of around 15% of sulfates.
According to the Journal of the American College of Toxicology, concentrations more that 1% is dangerous.
Sulfates Can Cause Skin Damage
Sulfates are considered to be safe in small quantities by the FDA and the Cosmetic Ingredient Review. Tests ran by the American College of Toxicology stated that concentrations below 1%, or higher concentrations intended for discontinuous usage, were found to pose no risk to human, however, in high concentrations for continuous use did cause cellular damage. Tests ran on rats using 15% or more of prolong exposure caused skin irritation, depression, labored breathing, diarrhea, and even death.
In conclusion, it is important for your long-term hair health to use sulfate-free shampoos and conditioners. Using ones like the El Patron shampoo or Label M. Purifying Shampoo. Your hair will last longer, be healthier, and look great.