Methylene blue is a synthetic compound that’s been used in medicine for more than a century, originally as a dye but now as a treatment for specific conditions. It acts as an antioxidant and anti‑inflammatory agent, supports mitochondrial function, and has mood‑related effects because it works as a mild MAOI.

1. Antioxidant & anti‑inflammatory effects

Medical experts note that methylene blue has antioxidant, anti‑inflammatory, antidepressant, and analgesic (pain‑relieving) properties . These effects may help protect cells from stress and reduce inflammation.

2. Supports mitochondrial function (energy production)

Some researchers are exploring methylene blue’s ability to protect mitochondria, the cell’s energy factories, which is why it’s being studied for cognitive and aging‑related benefits .

3. Pain relief in specific medical settings

Methylene blue has shown strong results for reducing pain from oral mucositis (a severe mouth‑ulcer condition caused by cancer treatments). A randomized clinical trial showed significant pain reduction within two days of treatment .

4. Mood‑related effects (MAOI activity)

It acts as a monoamine oxidase inhibitor (MAOI), which can produce antidepressant‑like effects.