news report
Could Boosting Vitamin D Cut COVID-19 Risk?
https://www.medpagetoday.com/infectiousdisease/covid19/88456
Patients with "likely deficient" vitamin D status had nearly doubled risk of testing positive for COVID-19 versus those with "likely sufficient" vitamin D, a single-center study found.
Among nearly 500 patients, the relative risk for infection was 1.77 (95% CI 1.12-2.81, P=0.02) in those judged to be vitamin D-deficient (below 20 ng/mL or 18 pg/mL, respectively) compared with patients believed to have sufficient vitamin D,
research
https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2770157
Findings In this cohort study of 489 patients who had a vitamin D level measured in the year before COVID-19 testing, the relative risk of testing positive for COVID-19 was 1.77 times greater for patients with likely deficient vitamin D status compared with patients with likely sufficient vitamin D status, a difference that was statistically significant.
Meaning These findings appear to support a role of vitamin D status in COVID-19 risk; randomized clinical trials are needed to determine whether broad population interventions and interventions among groups at increased risk of vitamin D deficiency and COVID-19 could reduce COVID-19 incidence.
ps
本人以往经验：
对正常成年人，晒太阳也许有用。对于女五十以上，男六十以上，或某些慢性疾病状态下，晒太阳已经于事无补，需要额外补充。
如果血D3 (25-hydroxyvitamin D)很低（<8），需要肌肉注射D2,或D3；
如果在10～20，可以口服，至少要每天1000IU。
长期服用5000IU/天，会导致VD超标。
要定期去测试，及时调整剂量。
