Several quality brands of methylene blue are recognized for their purity and effectiveness. Here’s a summary based on recent findings:

1. Compass Laboratory: This brand offers high-quality methylene blue and has received positive feedback from users, holding an average rating of 4.4 stars on Amazon based on over 1,600 reviews (Colorado Daily).

2. Earth Harmony: They provide 99.99% pharmaceutical-grade methylene blue, enhanced with a dropper for convenience and designed for increased absorption and effectiveness in photodynamic applications (Amazon).

3. Best365 Labs: This brand is noted for its high-quality, USA-made pharmaceutical-grade methylene blue. It has been highlighted in social media reviews as a top choice among health enthusiasts looking for quality supplements (Instagram).

4. Provayblue: This is a brand specifically used in clinical settings for treating medical conditions like methemoglobinemia. It is a recognized medical-grade formulation available through healthcare providers (Mayo Clinic, Cleveland Clinic).

You can find these brands and products through various platforms like Amazon and other health supplement retailers. Always ensure to check for quality certifications and third-party testing for purity if you are considering any of these products.

Sources

Methylene Blue - Amazon.comBest Methylene Blue Buyer's Guide: Top-Rated ... - Colorado DailyI Finally Found the Best Methylene Blue! I've been ... - InstagramEarth Harmony 99.99% Pharmaceutical Grade Methylene Blue with ...Methylene blue (intravenous route) - Mayo ClinicMethylene Blue Powder - eBayMethylene Blue (Provayblue): Uses & Side Effects - Cleveland Clinic

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