Careful with that stuff. If you take too much it can cause serotonin syndrome…
I've been occasionally seeing methylene blue mentioned on nostr, but usually with very little information about it. nostr:npub1kemda478drtx5at65wt8kyjrmy9l27hmp8gsgnfjr8vdgf8y46sqsw0hnv has done the best research I've seen on methylene blue:
Discussion
That seems to be a problem with taking MB along with other serotonergic agents, not from taking MB by itself within the established recommendations.