I made a video a few months ago about my 2-year experiment with Methylene Blue.
However, I kept getting asked the same question over and over again:
Is methylene blue safe?
Some people said no. Some said yes. Most were unsure.
So today, you’ll discover what the clinical studies actually say about safety, and more importantly, my real-world experience and feedback from people who have used it.
What Is Methylene Blue?
As I mentioned in my original video, even though methylene blue was first discovered in 1876 as a textile dye, it does have FDA approval for treating methemoglobinemia – a rare blood disorder.
This is extremely important because not all methylene blue sold online is safe for human use.
I’ll explain the correct form to use.
Common Acute Side Effects
Short-term side effects may include:
- Nausea
- Vomiting
- Abdominal discomfort
- Dizziness
- Headache
- Sweating
- Temporary blue or green discoloration of urine, skin, or mucous membranes
The first time I used methylene blue, my urine turned slightly blue. At first, it worried me because I wasn’t expecting it.
However, this is harmless unless you’re using very high doses regularly.
Unfortunately, there are influencers promoting extremely high doses.
For some reason, especially among men, there’s this belief that more is better.
With drugs – and most things in life – that’s simply not true.
Serious Risks and Contraindications
Methylene blue can cause hemolytic anemia, particularly in people with G6PD deficiency.
Hemolytic anemia occurs when red blood cells are destroyed faster than the body can replace them. Symptoms may include fatigue, jaundice, dark urine, and an enlarged spleen.
There have also been rare but serious reactions reported, including:
- Severe hypertension (dangerously high blood pressure)
- Anaphylaxis (a life-threatening allergic reaction)
Anaphylaxis affects the entire body and requires immediate medical treatment.
It’s similar to a severe asthma attack and can be fatal.
Serotonin Syndrome & Drug Interactions
This is one of the more common issues I see discussed online today.
Methylene blue inhibits monoamine oxidase A (MAO-A). When combined with serotonergic drugs, it can trigger serotonin syndrome, which can be life-threatening.
This includes:
- SSRIs and SNRIs
- Tricyclic antidepressants
- MAO inhibitors
- Drugs like Prozac
Because of this, FDA labeling strongly warns against combining methylene blue with serotonergic medications.
This also applies to natural supplements that raise serotonin, such as:
- 5-HTP
- L-tryptophan
Safety Doses
Pharmacology references note that methylene blue is generally well tolerated at doses below 2 mg per kg of body weight, when used briefly and under supervision.
For example:
- 150 lbs ≈ 70 kg
- 2 mg/kg ≈ 140 mg per day
However, this dose is intended for short-term medical use – not long-term daily supplementation.
In my opinion, this is an extremely high dose.
I’ve had many people contact me after experiencing negative side effects at these levels.
These doses were used in sick patients, not healthy individuals, using methylene blue as a nootropic.
For healthy people, I do NOT believe high doses are safe long-term.
My Suggested Dose
If your goal is to use methylene blue for:
- Energy
- Mitochondrial support
- ATP production
- Nootropic benefits
Then start low.
- Start with 5 mg daily
- After 2 weeks, increase to 10 mg daily if needed
- Then 15 mg, then 20 mg, each for 2 weeks
Based on hundreds of clients and patients, 50 mg daily is the absolute maximum I’d ever suggest.
My Personal Dosage
Personally, I use:
- 5–10 mg daily
- Occasionally up to 15 mg
- 4–5 days per week
After 3–4 weeks, I stop for 1–2 weeks before repeating.
Cycling is critical. Do not take it continuously without breaks.
Best Form to Use
None of this matters if you use the wrong form.
Use only:
- Pharmaceutical-grade / USP methylene blue
Do NOT use:
- Aquarium methylene blue
- Fish tank products
- Industrial dye
These contain contaminants and impurities that are unsafe for humans.
Take methylene blue earlier in the day to avoid insomnia or overstimulation.
Blue or blue-green urine and stool are normal.
Final Thoughts
Methylene blue is not a magic anti-aging drug.
Don’t blindly follow online influencers who don’t understand human physiology.
Start low. Increase slowly. Cycle regularly.
If you have questions, let me know —and make sure you watch the original video.