Tattoo Ink Ingredients Are Largely Unregulated by the FDA, Complicating Removal

The FDA has not approved any pigments for injection into the skin for cosmetic tattoo purposes. Tattoo inks are technically classified as cosmetics, but until the Modernization of Cosmetics Regulation Act of 2022, the FDA had virtually no enforcement authority over them. A 2024 study published in Analytical Chemistry found that only 6 out of 54 inks analyzed matched their labeled composition accurately, and 45 inks contained unlisted pigments or additives including polyethylene glycol. Published research has found inks containing heavy metals such as cadmium, lead, mercury, and arsenic, as well as pigments originally designed for printer toner and car paint. This matters for removal because unknown ink composition makes laser treatment unpredictable. Different pigments respond to different laser wavelengths, and if the practitioner does not know what is actually in the tattoo (because neither the client nor the tattoo artist knew), they cannot optimize treatment settings. Worse, some metallic pigments can oxidize under laser exposure, turning darker instead of lighter -- a phenomenon called paradoxical darkening that is particularly common with cosmetic tattoos (permanent makeup) containing iron oxide or titanium dioxide. The structural cause is a decades-long regulatory gap. The FDA historically deprioritized tattoo ink regulation because it did not receive enough adverse event reports to justify action -- but adverse events were underreported precisely because there was no mandatory reporting system. The 2022 legislation gave the FDA recall authority and required annual ingredient labeling updates, but enforcement remains in early stages and the existing stock of unregulated inks will be in people's skin for decades.