More and more people are getting tattoos these days - thanks to the trend set by celebrities like singers the late Amy Winehouse and Christina Aguilera, actors Angelina Jolie and Jake Gyllenhaal, and soccer star David Beckham.

However, recent studies have found that the inks contain a host of dodgy substances, including some phthalates, metals, and hydrocarbons that are carcinogens and endocrine disruptors, prompting the U.S. Food and Drug Administration to launch a probe.