https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8995185/
關鍵是劑量要大（500毫克沒什麽用，要以克為單位），大劑量維生素C可以縮短新冠病程，降低死亡率，減輕嚴重性，減少長期後遺症等等。未見嚴重的副作用。因為沒有商業利益，這種研究常常被忽視。
結論原文：
Briefly summarised, high-dose vitamin C has been shown to reduce inflammation, improve oxygen support status, and reduce mortality in COVID-19 patients, all without causing any negative side effects. Additionally, it may be beneficial for specific subgroups of patients with severe and critical condition, as well as for older individuals. High-dose vitamin C may prove to be an effective treatment for COVID-19. Furthermore, there is an urgent need to investigate the direct relationship between serum/plasma nutritional C levels and the incidence and severity of COVID-19 infection.
