Meraki Blu USP Grade Methylene Blue
At a glance
Summary
Meraki Blu USP Grade Methylene Blue scores 100/100. A single-ingredient, USP pharmaceutical-grade methylene blue solution with nothing else added — no fillers, dyes, sweeteners, or preservatives. Third-party testing by Light Labs (2026) returned non-detect for every heavy metal screened — lead, cadmium, arsenic, and mercury — and formaldehyde came back below 10 ppm against a 100 ppm limit. USP grade is the meaningful distinction in this category: industrial and reagent grades of methylene blue can carry heavy-metal and contaminant dye residues, and this product verifies by lab that it does not.
Contaminants 5
Source: Light Labs, 2026
Lead Not detected Not detected
Non-detect — no measurable lead was found at the laboratory's screening limit, and the result was returned in-spec. No safe level of lead exposure exists per CDC, AAP, and WHO; this product passes the strictest screen.
Heavy-metals panel by Light Labs (2026): lead returned non-detect (ND), in-spec.
Cadmium Not detected Not detected
Non-detect — no measurable cadmium was found at the laboratory's screening limit, and the result was returned in-spec.
Heavy-metals panel by Light Labs (2026): cadmium returned non-detect (ND), in-spec.
Arsenic Not detected Not detected
Non-detect — no measurable arsenic was found at the laboratory's screening limit, and the result was returned in-spec.
Heavy-metals panel by Light Labs (2026): arsenic returned non-detect (ND), in-spec.
Mercury Not detected Not detected
Non-detect — no measurable mercury was found at the laboratory's screening limit, and the result was returned in-spec.
Heavy-metals panel by Light Labs (2026): mercury returned non-detect (ND), in-spec.
Formaldehyde <10 ppm Not detected
Non-detect — no measurable formaldehyde was found down to the laboratory's 10 ppm quantification limit, against an in-spec limit of 100 ppm. The result came back an order of magnitude below the allowed ceiling.
Formaldehyde assay by Light Labs (2026): result <10 ppm against a <100 ppm specification, returned in-spec.
Key ingredients 1
Methylene Blue (USP Grade)Very Good
USP pharmaceutical-grade methylene blue — the purity standard that separates it from industrial and reagent grades, which can carry heavy-metal and contaminant dye residues. Single active ingredient with no fillers, sweeteners, or preservatives added.
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