COMPASS LABORATORY Methylene Blue 1% USP-Grade Methylthioninium Chloride Liquid | High Purity Dietary Supplement for Brain Function & Cognitive Health | No Formaldehyde 237ml Glass BottleCOMPASS LABORATORY Methylene Blue 1% USP Grade High Purity Cognitive Support Supplement (237ml Glass Bottle) Elevate your mental clarity and overall cellular wellness with Compass Laboratory Methylene Blue 1%, a USP grade, high purity formula designed for advanced cognitive and metabolic support. Crafted to the highest standards, this premium Methylthioninium Chloride solution is rigorously tested to ensure exceptional purity, stability, and safety