Though the vitamin C in lemon juice can help strengthen one's immunity, there is no evidence that it can kill Coronavirus.
In its report on 'Corona claims checked by experts,' the University of Queensland on March 18, 2020, stated that hot drinks with lemon and honey, vitamin supplements, foods with garlic and ginger, apple cider vinegar, and gargling with salt water does not have any impact on the human immune response, and would not eliminate the Coronavirus.
A Healthline report on the same talks about the benefits of consuming Vitamin C. It says that Vitamin C affects your immune health in several ways. "Its antioxidant activity can decrease inflammation, which may help improve your immune function". The vitamin also boosts the activity of phagocytes, immune cells that can "swallow" harmful bacteria and other particles. It says that while physicians and researchers are studying the effects of high-dose intravenous (IV) vitamin C on Coronavirus, no supplement, including vitamin C, can prevent or treat COVID-19.
Even WHO has asserted the same in a column of 'Fact or Fiction. The WHO says that there is no evidence to prove that lemon, hot water, etc., could kill the virus or cure a person with COVID-19.
Therefore, though lemon juice can indeed play a role n building one's immunity, it is very wrong to say that it can cure Coronavirus.
The COVID-19 pandemic has given rise to a lot of potentially dangerous misinformation. For reliable advice on COVID-19, including symptoms, prevention, and available treatment, please refer to the World Health Organisation or your national healthcare authority.
The COVID-19 pandemic has given rise to a lot of potentially dangerous misinformation. For reliable advice on COVID-19 including symptoms, prevention and available treatment, please refer to the World Health Organisation or your national healthcare authority.