Eh, promoting microdosing, especially in regards to combating mental health issues, is foolish in my opinion. The case studies showing that psychedelics have the potential to positively impact personality, alleviate depression, and reduce anxiety long term suggest that it's likely the psychedelic experience itself, not merely the introduction of a psychoactive compound, that spurs positive changes in the brain.
I'm all for utilizing psychoactive substances for metaprogramming and healing, but I would recommend doing so in a controlled setting with an experienced sitter, or more preferably a trained therapist or shaman, at or above the threshold dose.
If you haven't already, I suggest reading Joe Atwill and Jan Irvin's article "Manufacturing the Deadhead: A Product of Social Engineering..."
And if you're struggling with mental health issues, I suggest getting in contact with a naturopathic physician. http://well.org/medicine/mind-guest-dr-kelly-brogan/
And for those in need of more immediate assistance, I recommend looking into kratom... or cannabis.
yeah i've heard of folks microdosing with cannabis, which seems like a much lighter entry-point, if one is set on self-medication