I received my vitamin D results yesterday and my serum level came back at 35 ng/mL...
I'm going to start supplementing with vitamin D 10000 IU/day and getting 20 min of sun on my chest/back on the weekends. I'll be monitoring my acne/sebum levels and get retested in 4-6 weeks to check if I hit my target serum level of 50 ng/mL.
After 4 weeks of supplementing with vitamin D 10000 IU/day and getting about 90 minutes of sun on my body on the weekends, my serum level is now 61 ng/mL. There hasn't been any change to my sebum levels or my acne severity, though maybe it'll take some more time to see results.
I do feel like I have more energy as of late, though it's tough to say if Vitamin D is responsible.