This way, you can make a more informed decision on what’s right for you. Because here at mbg, we believe that the power of beauty is in your hands. Here are the main ingredients that come up and what to know about them: However, Thompson notes that modern formulas have significantly less of these dyes than the past versions. “Back in the day, the color was much different dye than what we use today. You can see the difference: Past hair dyes used to be so opaque and harsh, but now formulas are softer and look much more natural. As we’ve learned more, we know what molecules we need to minimize and at what concentrations,” she says, noting that while many of the hair color formulas still use these dyes, they do so at much lower levels—swapping out the ingredient for safer dyes. While you’re coloring the hair, be mindful to follow instructions: Wear gloves, follow the time limits, and so on. Oh, and the same goes for ventilation here: Most people probably color their hair in their bathroom, but that likely doesn’t have the same airflow. Try the kitchen and open up a window. Or, says Thompson, embrace gray. “Often people who have been dyeing their grays for years are scared to transition to gray, not because they don’t like the look of gray but because they are afraid of the grow-out process. But there are colorists who specialize in this transition phase who can help you go gray in a really beautiful, natural way.”