Can we use neem leaf in corona treatment direct use for patient?

There are many home remedies and herbal treatments that people believe may cure coronavirus infection. However to prove that a treatment really works, one needs extensive trials and research. Anybody who’s making specific medical claims needs to supply a quality body of evidence to show that it works consistently. There are several food-based options such as consuming garlic, turmeric, neem, ginger, etc believed to boost immunity but not specifically against the Coronavirus infection. There is no harm in consuming these but the most important steps you can take now to protect yourself from COVID -19 infection is to practice hand hygiene and carry out social distancing

Does lemon kill coronavirus?

Vitamin C helps build immunity and fight off infection. There are umpteen foods rich in Vit C like gooseberry, oranges, lemons, etc which you can have.

However, lemon cannot cure or prevent COVID 19 in particular.

Have Vitamins C and D been adopted as coronavirus treatment?

Vitamin C  does support the function of immune cells and enhances their ability to protect against infection. Vitamin C is a powerful antioxidant, protects against damage induced by oxidative stress, which can affect immunity. Supplementing with vitamin C has been shown to reduce the duration and severity of upper respiratory tract infections, including the common cold.

Studies have shown that vitamin D significantly decreased the risk of respiratory infections in people deficient in this vitamin and lowered infection risk in those with adequate vitamin D levels. This suggests an overall protective effect. Other studies note that vitamin D supplements may improve response to antiviral treatments in people with certain infections, including hepatitis C and HIV.

However, these are not guaranteed to prevent or cure COVID-19 infection specifically. Nutritional supplements should be not be considered to be substitutes for a good diet, because no supplements contain all the benefits provided by healthy foods.

Is this saibal ointment if applied externally to the hands Is there any chance to prevent transmitting corona virus?

The only way to prevent coronavirus infection is to wash hands with soap and water or a hand sanitizer with over 60% alcohol content.

Can eating one teaspoonful of chyawanprash help in fighting the new coronavirus infection?

Many food items and herbal remedies are thought to boost immunity. They are not specific preventive or curative therapies against Coronavirus.One such is Chyawanprash. Our Ministry of Ayush has recommended taking Chyavanprash 10gm (1tsp] in the morning. Diabetics should take sugar-free Chyavanprash. This is for boosting general immunity.
There is no harm in consuming this but the most important steps you can take now to protect yourself from COVOD -19 infection is to practice hand hygiene and carry out social distancing.