Looking to buy methylene blue online? Our 1% USP grade methylene blue solution is 99.9% pure and independently tested at a US-accredited laboratory with over 30 quality checks per batch. Mixed and bottled in Vancouver, BC. Ships from Vancouver for Canadian orders and from our Texas warehouse for US orders. Do not use if you are: Taking SSRIs, SNRIs or MAO inhibitors. Risk of serotonin syndrome, a potentially life-threatening condition Taking any other serotonin-affecting substances including triptans, dextromethorphan or St. John's Wort Taking any prescription stimulants. Diagnosed with G6PD deficiency Pregnant or breastfeeding Taking any prescription medication that affect serotonin. Consult your doctor before use. For research purposes only. Not intended to diagnose, treat, cure or prevent any disease.Methylene blue is not approved by Health Canada or the FDA for personal consumption. This applies to all methylene blue products sold in Canada, not just Heisen Blue. Our methylene blue is sold strictly for research purposes only. Read the full safety guide including all contraindications and drug interactions Key Features: USP-Grade Purity: pharmaceutical-grade methylene blue meeting United States Pharmacopeia standards. Not industrial or technical grade. Third-Party Tested: independently tested at BeaconPoint Labs, a US-accredited laboratory. Over 30 quality checks per batch covering identity, potency, heavy metals, microbial and residual solvents. Tested on the Final Bottled Solution: not just the raw powder. What gets tested is what you receive. Batch-Specific COA: every bottle carries a batch number tied to a publicly available Certificate of Analysis you can verify yourself. Heavy Metals Screened: mercury, lead, arsenic and cadmium all tested and confirmed well below USP daily exposure limits. No Fillers or Additives: contains USP-grade methylene blue and distilled water only. Nothing else. Precision Dropper Included: dropper for accurate and controlled dispensing. Dark Amber Glass Bottle: UV-protective amber glass preserves product integrity and extends shelf life. 120ml Bottle: up to 6 months of daily research use at a consistent dose. Made in Canada: mixed and bottled in Vancouver, BC. 30-Day Money Back Guarantee: not satisfied within 30 days? Full refund. No questions asked. What Is In the Bottle Heisen Blue 1% Methylene Blue Solution contains USP-grade methylene blue dissolved in distilled water. Nothing else. No fillers, no stabilizers, no undisclosed additives. The 1% concentration means each mL of solution contains approximately 10 mg of methylene blue, and each drop delivers approximately 0.5 mg. The 120ml bottle provides a generous research supply. At a consistent daily dose it covers approximately 6 months of use. Why Grade Matters Not all methylene blue sold online is pharmaceutical grade. Industrial and technical grade methylene blue is produced for dyeing and chemical processing applications and is not manufactured to pharmaceutical purity standards. It may contain heavy metals or residual solvents at levels not appropriate for research use. Heisen Blue uses USP-grade methylene blue powder sourced from established pharmaceutical manufacturers. USP-grade means the compound has been manufactured to the purity and identity standards set by the United States Pharmacopeia. the same standard used in clinical research and pharmaceutical compounding. Learn more about the difference between USP-grade and industrial-grade methylene blue Independent Third-Party Testing Every batch of Heisen Blue is tested at BeaconPoint Labs in Kannapolis, North Carolina, an independent US-accredited laboratory. The batch-specific Certificate of Analysis covers: Identity confirmation: USP Methylene Blue reference method, result: Confirmed Potency and assay: confirms the labeled concentration is within USP tolerance limits Heavy metals: mercury, lead, arsenic and cadmium tested via FDA-EAM 4.7 ICP-MS method, all results well below USP limits Aerobic plate count: total microbial load, result: less than 10 CFU/mL Microbial pathogens: E. coli, Salmonella and Staphylococcus aureus, all absent Yeast and mold: both less than 10 CFU/mL Residual solvents: over 20 individual solvents tested via USP GC/MS, all Not Detected View the full Certificate of Analysis About Our Sourcing Our USP-grade methylene blue powder is sourced from a US distributor whose suppliers are established pharmaceutical manufacturers in India. All solutions are mixed and bottled in Canada. No facilities in North America actually manufacture USP-grade methylene blue powder from scratch. Companies claiming "made in USA" or "made in Canada" are typically mixing overseas pharmaceutical powder into solutions domestically, which is exactly what we do, openly and transparently. What distinguishes responsible suppliers is the grade of powder used and the rigor of independent testing applied to the finished product. Ordering in Canada and the United States Heisen Blue ships to all Canadian provinces and territories from our Vancouver, BC facility and to all 50 US states from our third-party fulfillment warehouse in Texas. Canadian orders: ship from Vancouver, BC via Canada Post or Intelcom. Typical delivery is 3 to 9 business days depending on your province. Free standard shipping on orders over $40. No customs delays or cross-border import fees. US orders: ship from our Texas warehouse via USPS. Typical delivery is 3 to 7 business days. Free standard shipping on orders over $40. Your order ships domestically from within the United States, not from overseas. 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