Issue #128 | July 17th, 2026 | Previous issues​

Hey Reader,

My nephew graduated kindergarten recently and was awarded a certificate his teacher created solely for him: Rad Researcher.

In my nephew's words, he loves researching living and nonliving things.

That kid has my heart!

It also runs in our blood.

While I wouldn't say I'm a rad researcher, I would say that I have an insatiable curiosity.

I love learning, and there's always something to learn. (Greatest understatement of the year.)

Anyway, have you ever heard of methylene blue?

It's having a massive moment in the wellness and biohacking world.

Depending on which corner of the internet you wander into, it supposedly improves focus, sharpens memory, increases energy, and protects the brain.

It is also being used by some doctors, pharmacists, and patients as an off-label treatment for long COVID, including symptoms they believe may be connected to persistent spike protein.

Research is still developing, but many people report meaningful improvement.

But there are two critical safety warnings I learned and would like to share with you in case you're interested in trying it.

From textiles to the ER

First synthesized as a textile dye in 1876, methylene blue later became one of the earliest synthetic drugs used in medicine. Chemically called methylthioninium chloride, it's a synthetic salt molecule.

Scientists eventually discovered it could stain biological tissues and microorganisms, making previously invisible structures—such as parasites—visible under a microscope.

By 1891, it was being used to treat malaria.

Today, an injectable prescription form is FDA-approved to treat acquired methemoglobinemia—a rare, potentially life-threatening condition in which altered hemoglobin can no longer deliver oxygen normally to the body.

The Hidden Danger

Methylene blue is one of a small number of medications with strong evidence that it should be avoided by people with G6PD deficiency—an inherited condition involving an enzyme that helps protect red blood cells from oxidative damage.

More than 400 million people worldwide are estimated to have G6PD deficiency.

Many live completely normal, symptom-free lives and have no idea they have it.

You may have heard of this deficiency in connection with fava beans. In people with G6PD deficiency, eating fava beans can trigger the same dangerous breakdown of red blood cells—a reaction known as favism.

High-dose intravenous vitamin C can also cause hemolysis in someone with the deficiency, which is why many practitioners require G6PD testing before administering it.

Likewise, in someone with G6PD deficiency, methylene blue can trigger the breakdown of red blood cells, potentially causing severe hemolytic anemia or a hemolytic crisis. Symptoms may include sudden fatigue, jaundice, and dark or tea-colored urine.

Because G6PD deficiency is an inherited X-linked condition, it is more common in males—but women can also be affected and may never know it.

The Antidepressant Conflict

Methylene blue also inhibits an enzyme called monoamine oxidase A.

That means it can interact dangerously with medications that increase serotonin—including common antidepressants such as Lexapro, Zoloft, and Prozac, as well as certain other medications and opioids.

The result can be serotonin syndrome, a potentially life-threatening excess of serotonin.

The Golden Rule

Methylene blue is a powerful, fascinating medical tool—but it is not a casual daily vitamin.

If you want to safely explore it, even at low doses, it’s important to ask your doctor for a routine quantitative G6PD blood test.

A normal quantitative G6PD result confirms that you do not have the enzyme deficiency that makes methylene blue dangerous for red blood cells. You should still check for medication interactions—especially antidepressants and certain opioids.

And please don't ingest aquarium, industrial, or laboratory-grade methylene blue. “Methylene blue” on a bottle does not automatically mean pharmaceutical-grade or safe for human use.

Here’s a PubMed article my doctor shared with me for those of you with more scientific minds:

​https://pubmed.ncbi.nlm.nih.gov/20701405/​

Curiosity is wonderful.

Curiosity with a blood test and a qualified pharmacist is even better.

Please research living and nonliving things responsibly.

My kindergarten nephew would expect nothing less.

With love,

Anna

​aferalhousewife.com​