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Pharmaceutical-grade versus industrial-grade sourcing

Methylene blue is available in multiple grades: pharmaceutical-grade (USP, suitable for human use), laboratory-grade (reagent or analytical grade, suitable for research but not intended for human administration), and industrial-grade (textile or microscopy dye

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  • Methylene blue is available in multiple grades: pharmaceutical-grade (USP, suitable for human use), laboratory-grade (reagent or analytical grade, suitable for research but not intended for human administration), and industrial-grade (textile or microscopy dye, not suitable for human use under any circumstances). The differences are significant: non-pharmaceutical grades can contain heavy metal contaminants — including arsenic, lead, and cadmium — as well as impurities from the manufacturing process. For oral or intravenous use, only pharmaceutical-grade material should be considered. Products marketed as "USP methylene blue" should carry a certificate of analysis from an accredited third-party laboratory confirming purity, identity, and absence of toxic impurities. Industrial dye is categorically not appropriate for human ingestion, regardless of claims about equivalence at low doses.