Methylene blue is all over TikTok, with fans of the supplement showing off their blue tongues and swearing the dye drops do everything from boosting brain power to warding off cancer. But can this ...

Wellness enthusiasts seeking to hack their way to health and longevity have a new favorite remedy — one that stains their tongues blue. Methylene blue has been around since the 1870s when it was used ...

Born as a coal-tar dye, reborn as a “magic bullet,” methylene blue has taken an improbable journey from textile vats to today’s biohacking. Its appeal rests on a seductive mix of real biochemistry and ...