Methylene Blue FAQ

Answers about our methylene blue drops, safety, orders, payment and shipping.

Refund Policy

We offer a full refund on orders that haven't shipped yet, and on unopened orders.

Before shipment: to cancel an order before it leaves us, contact our customer service team as soon as possible for a full refund.

After shipment: you may return the unopened package. Once we receive it and confirm it is unopened and in its original condition, we will refund you. Return shipping costs are the buyer's responsibility.

What if I opened the package?

For the safety and well-being of our customers, we cannot accept returns if the product has been opened or used. This policy ensures the integrity and quality of our health and wellness products.

How do I track my order?

Once your order has shipped, you will receive a tracking number via email.  You can use this tracking number on the Shipping Carrier you selected.

Can I cancel or modify my order?

We try to process orders as quickly as possible, but if you need to modify or cancel your order, please contact our customer service team as soon as possible. We'll do our best to accommodate your request.

Is Methylene Blue Safe to Use?

Methylene blue has been used in medicine for over a century, and it is FDA-approved as an injection to treat methemoglobinemia. Small human studies of its effects on the brain have had mixed results, and long-term studies of low daily amounts in healthy people haven't been done.

It is not safe for everyone. Its FDA label carries a boxed warning against combining it with SSRIs, SNRIs, MAOIs and opioids, and it should not be used by people with G6PD deficiency. Avoid it if you are pregnant or breastfeeding, and ask a doctor or pharmacist before use if you take any medication. Read is methylene blue safe?

FDA Disclaimer

All products sold through this website have not been evaluated by the U.S. Food and Drug Administration (FDA). These products are not intended to diagnose, treat, cure, or prevent any disease. Customers are advised to consult with a qualified healthcare provider before using any of the products offered for sale on this website.

Is your Methylene Blue pharmaceutical grade?

Yes. Reviv Health uses USP-grade methylene blue. Our drops are a 1% solution (10 mg per mL) with no preservatives.

Our current third-party lab report (Murray-Brown Laboratories, report 2511810, November 2025) tests for:

  • Heavy metals: arsenic, cadmium, lead and mercury
  • Microbes: bacteria, yeast and mold, E. coli and salmonella
  • Residual solvents

View the lab report

How Should I Take Methylene Blue?

Follow the serving on your bottle's label and start at the low end. Mix the drops into a glass of water, since methylene blue stains the mouth and teeth. Many people take it in the morning. Our dosage guide explains how drops and mL convert to milligrams.

Are there any side effects?

Side effects listed on the FDA label for methylene blue include:

  • Blue or green urine (expected and harmless)
  • Nausea, diarrhea or stomach discomfort
  • Headache or dizziness

Serious reactions, including serotonin syndrome, can happen when methylene blue is combined with antidepressants or other serotonergic drugs. Check your medications with a pharmacist before use.

How long does it take to feel anything?

There is no good trial data on how quickly supplement servings work, and experiences vary. The one predictable sign is blue or green urine within a few hours. See what the research shows for more detail.

Payment Questions

We accept a variety of payment methods including credit cards (Visa, MasterCard, American Express), PayPal, and Apple Pay.

Yes. Checkout runs on Shopify, which is certified PCI DSS Level 1, the highest standard for handling card payments. We never see or store your full card number.

Shipping Questions

Most orders ship within 1–2 business days (Monday to Friday, excluding holidays). Within the US, standard delivery usually takes 3–7 business days after that, and faster options are shown at checkout. You'll get a tracking number by email when your order ships. Full details are in our shipping policy.

Shipping is free on orders of $99 (USD) or more to the US and Canada. Below that, US shipping is calculated at checkout, and Canadian orders are $9 for standard or $19 for express shipping.

Yes. Orders of $99 (USD) or more ship free to the US and Canada.

Yes, with standard shipping. Some expedited carriers can't deliver to P.O. boxes, so choose standard shipping if you use one.