Protocol for Part 1:
* A single blood draw at SCNM to measure levels of vitamin D and other nutrients, comprehensive metabolic panel, and complete blood count with differential
* Completing a medical history/symptom form
* Completing a form about COVID-19 symptoms every 2 weeks for 6 weeks
* Authorization for release of medical records related to COVID 19 testing and/or treatment.
Protocol for Part 2:
* Take a vitamin D supplement daily for two weeks, at a dosage of 10,000 IU/day b.i.d. (age 18-69 years) or 15,000 IU/day t.i.d. (age 70+)
* After two weeks of taking vitamin D, return to SCNM for a blood draw to remeasure levels of vitamin D, comprehensive metabolic panel, and complete blood count with differential. If vitamin D levels are still below 30 ng/ml, continue the dosage for 3 more weeks. If vitamin D levels are 30-49 ng/ml, continue at a dosage of 5000 IU/day. If vitamin D levels are 50+ ng/ml, stop supplementation.
* Completing questionnaires about COVID 19 symptoms at 2, 4, and 6 weeks after treatment begins (5 minutes each time).
