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Re:Neuroscientists' Open Letter To DIY Brain Hackers by gherkin0 on Tuesday July 12, 2016 @01:45PM (#12080986)
That's a lot. Vitamin D tests are easy to get, so I just took a few over a few months to find a dose that would keep me at ~50ng/ml. Previous to that, I had taken 5000+ IU/day for some time and the test showed my levels were very high.

It looks like this site has a nice chart: https://www.vitamindcouncil.org/further-topics/i-tested-my-v...

Re:Neuroscientists' Open Letter To DIY Brain Hackers by AnkhMorporkian on Tuesday July 12, 2016 @02:07PM (#12081153)
I did end up taking a Vitamin D test after I had started supplementing, and on that dosage I'm still a little below normal levels.