Certificates of Analysis

Best 365 Labs sources USP grade Methylene Blue. Final products meet USP standards.

United States Pharmacopeia (USP) Limit for Nutritional Supplements 
Lead 10 ppm
Arsenic 3 ppm
Cadmium 3 ppm
Mercury 3 ppm
If your label recommends one single daily dose of 500mg, the PPM in your product can not be higher than:
Lead = 0.900 ppm
Arsenic = 20.000 ppm
Cadmium = 8.200 ppm
Mercury = 0.600 pp