实验的n有60万美国退伍军人

看他们不同的维生素d3水平 在新冠里的表现

nature算是顶刊了 scientific report是nature旗下的 应该也不会水到哪里去吧

Among VA patients, vitamin D3 and vitamin D2 supplementation reduced the associated risk of COVID-19 infection by 20% and 28%, and COVID-19 infection ending in death within 30-days by 33% and 25%. Black veterans receiving supplementation had a larger associated reduction than whites, although both were statistically significant, and the difference was not accounted for by differences in vitamin D serum levels. Patients with low vitamin D levels at baseline benefited more from supplementation than patients with higher serum levels. Finally, patients receiving higher cumulative dosages and higher average daily dosages had a greater associated reduction in COVID-19 infection rates than patients receiving lower dosages conditional on similar vitamin D serum levels. The most substantial dose–response relation was found in patients with the lowest vitamin D serum levels. As a widely available, inexpensive, and safe treatment, vitamin D3 could be a helpful tool for reducing the spread of COVID-19 infection and related mortality and reducing racial disparities in COVID-19 outcomes. Our findings are especially relevant to the US population, given that about half of Americans are estimated to have sub-optimal vitamin D serum levels.

🥚🐔贴吧

没人我再打个🦶

结论中提到黑人补充维生素D效果更好。理由是黑人皮肤黑在阳光下合成维生素D的效率差。所以黑人吃了维生素D的改善效果好，相比于白人。因为白人皮肤白，阳光下本身合成维生素D的能力好，所以维生素D的水平高一些，所以补充相同维生素D的效果比黑人差一点。

结论中直接提到维生素D3和D2可以将感染风险下降20%和28%

死亡风险VD3下降33%，VD2下降25%

文中说维生素D3易获得，廉价，安全。

可以减少种族差异的影响，感染率和死亡率。

从这项研究的动机来看，因为有好多质疑的声音说这项研究是为了卖维生素D3而写的。这里就有个这样的逻辑，首先维生素d3的牌子很多，不可能你说维生素d3好，钱就刚好进了这项研究赞助着的口袋。