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Vitamin D deficiency is a silent widespread issue for a lot of people. Had a battle with it a few years ago. Was tired no matter how much sleep I got, had negative motivation to do anything. Libido all but disappeared, and finally sought a doctor visit when I started have suicidal thoughts.
Turns out I just needed more sunshine and 50kiU once a week for a month.
Correct. 50,000 (imperial) iU. I was super deficient.