Are sulphites safe to eat? Yes, for most people. However, some people have sulphite sensitivity and may react to sulphites with allergy-like symptoms.
Some people believe that sulfates can directly damage your health. Since shampoo is used daily in many cases, the thought is that this much exposure to sulfates can lead to serious risks. Sulfates were once perceived to be cancer-causing agents, but further scientific evidence debunked these claims.