Longevity enthusiasts are buzzing after reports surfaced that Robert F. Kennedy Jr. may be a fan of methylene blue. President ...

Methemoglobinemia can trigger blue-tinged skin, dark brown blood, fatigue, seizures and, if left untreated, death. Methylene blue is currently the only effective treatment for the severe condition.

The Cleveland Clinic lists common side effects of methylene blue, including blue urine, nausea, vomiting, skin discoloration, dizziness, and headaches. Some studies also suggest that taking it in ...