Bluesun Methylene Blue Drops 1% Pharmaceutical Grade

What the brand says

Sold as “Bluesun Methylene Blue Drops 1% Pharmaceutical Grade - Made in USA, Formaldehyde-Free, Third-Party Tested, USP Purity 99.99%, GMO-Free, Alcohol-Free - 2 Fl Oz (60mL) in Amber Glass, 10mg/mL”