Yes – most henna for eyebrows does contain a very small amount of P-Aminophenol, Phenylenediamine or Diamino-phenoxyethanol, and some people can have sensitivities to these ingredients. Their purpose is to give the henna a faster processing time, neutralize the warmth and give a longer-lasting result. Without these ingredients, they will not process fast enough and there would be no point in having this as a beauty treatment in a salon. The service would take too long and the results would not be sufficient.