Methylene Blue Powder 20 Grams (USP Grade 99.8+%) - Prepare 2L 1% Solution [Value Pack 2025]

I have a 0.001g (milligram) accurate scale and, after buying this product, I made a 1% solution by adding ONE (not 4 like the description says) scoop of this powdered pure methylene blue to100ml of distilled water.I have no way of verifying purity, I'm simply trusting and hoping that the seller is honest.So far I've only been using it for 2 days at very low dose so it's too early to tell if it's working, but I have nothing bad to say about it.One big positive, if you're capable of mixing your own and you plan to use this long term, it's that this is far cheaper than buying 20 individual100ml bottles of 1% solution.

i use this for over 1 year now. best value.

I like to keep a good amount of MB around, as it's useful in a number of chemical reactions, and is also useful has a titrant for dissolved hydrogen when combined with colloidal platinum. So far, it seems good, but if it gives me any problems I'll update this.