People often regard it as a traditional natural hair dye and conditioner practice ... about the side effects before applying henna to hair. Allergic Reactions: The application of henna can ...

Some henna tattoos could cause a lifelong allergy to a common chemical found in dyes, warn scientists. The German researchers warn that the trendy Some henna tattoos could cause a lifelong allergy ...

Hair dyes contain chemicals that in rare cases can cause severe, even life-threatening, allergic reactions. Hair dye manufacturers say they are not intended for anyone under the age of 16.