Is henna bad for your hair?

No, real henna is not bad for your hair. But be careful, henna only comes in one color - reddish orange. If the product claims to dye your hair any other color, it's not pure henna - so read what else is in there. And avoid black henna at any cost. It's not henna at all, but a very nasty chemical that can be toxic. But if you want to dye your hair in the salon it can be bad. Henna contains metallic salts that react with other hair dyes. If you went to the salon and failed to mention that you use henna colours and the stylist put an ordinary colour on your hair the hair would be destroyed so don't forget to mention it in the salon.