PureGood Glass 2 Pack Pharmaceutical-Grade Methylene Blue 1% Solution (60 mL), USP-Grade, Third-Party Tested, Formaldehyde & Alcohol-Free, Methylene Blue for Humans in Amber Dropper Bottles

It is good quality.

I add a drop or 2 to water. There is no taste or odor. It can also be used for pets. I researched the benefits for pet use ( especially for my senior dog) and it also will benefit them. I take a few drops nightly and will titre up as suggested.

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

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.

This pure good 1% methylene blue USB grade is awesome. The dark blue color when mixing just a little bit with water lets you know that it's the real stuff. It has the right taste and is very effective when used for mental clarity energy and as an antioxidant. I have tried many brands some more expensive some less. But this pure good methylene blue in my opinion is the best I have come across so far. I recommend it to anyone who is curious about methylene blue and wants to try the real stuff. I will be reordering every month.