Proveblue : A source of very pure Methylene blue.
I don't know if, for those living in the US, the product is available; however for those living in the EU this is a very good product.
http://www.provepharm.com/Proveblue-R,7
I don't know if, for those living in the US, the product is available; however for those living in the EU this is a very good product.
http://www.provepharm.com/Proveblue-R,7