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RE: New Study Suggests Methylene Blue May Treat Skin Ageing
Yes, make sure you use at least USP grade if you inguest it. Not USP reag. but USP. There are some supplier for methylene blue USP. I guess the best quality esp. inguestion you will find on ceretropic or nootropics-source.com. If you buy it bulk, from some supplier, it will less cheaper. But for inguestion, 10g at 60mg should last very long. For non inguestion I cant say exactly. But maybe USP reag. is good enought.