Re the methylene blue discussion, taking it daily for several months gave me back my ability to remember strings of numbers, like a phone number.
There is a reliable seller on ebay I've bought from, who makes it for sale in 1 oz, 2 oz, and 4 oz bottles, "animalpharmnootropics". The direct website is animalpharm.us, for a little cheaper.
The bottle label reads 250 mcg MB per drop, dosage 1-4 drops twice daily. The 2 ingredients are MB and distilled water.