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Thank you for your comments Danny I bought and read the book Methylene blue by Mark Sloan, and in the book he also recommends a source he trusts for purity. I wonder if it’s the same company? I will check it out Danny Thanks a lot.

Yes, looking forward to smartest guy comments as well

Check this out

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3087269/

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