2 Pack Pharmaceutical Grade Methylene Blue 1% (60 mL), Third-Party Tested USP-Grade Methylene Blue for Humans, Formaldehyde and Alcohol Free Methylene Blue Pharmaceutical Grade in Amber Dropper Bottle

Mejoró mi concentración y energía. OJO: No hay que tomarlo junto con antioxidantes ni antiantidepresivos. Y tomar MENOS de la dosis recomendada. Es decir, para alguien que pesa 100 kilos que tome 25 a 40 gotas diarias es más que suficiente.

Delivery was fast, product was as described

Un des meilleurs vraiment de très bonne qualité!

The manufacturer (PureGood) didn't answer to my email where I request COA (Certificate of Analysis) for the lot number of methylene blue I've buy. so I don't trust their declarations on the label.

I have tried six different manufacturers of this methylene blue. Every single one of those would the exception of this are not USB grade. One manufacturer even puts on the bottle that there's food coloring in it. I tried all those different brands because they were cheaper than this one but if they don't work I don't care if they're free there's no point in getting those. This company and this manufacturer are 100% legit. It just sucks that the other brands that I have tried all have been fake methylene blue or fish tank cleaner One of the two.