The FDA regulates cosmetics via the Federal Food, Drug, and Cosmetic Act and the Fair Packaging and Labeling Act, neither of which define the term "organic." In other words, if you see hair dye that isn't henna and it claims to be organic or natural, it's "most likely still employing synthetic ingredients for it to work," Dr. Aral says. The good news: Hair dye doesn't have to be organic or natural in order to be safe, and there are other ways to be both health_ and eco_conscious when it comes to coloring your hair.
The last thing you want is to run out of dye halfway through the process. If your hair is shoulder length or longer, you may need two boxes to cover your whole head, depending on hair thickness. (And if you end up with a leftover box, you can always use it next time) Take the strand test : If you're trying a new shade, test it on a few trimmed hairs or hidden pieces first, and look at the result before you commit. A common horror story from testers who didn't do this: hair that turned orange and purple!