There is no truth in the claims that have been made.
However, there are many studies that show that Vitamin C is a necessary component for a healthy and efficient immune system.
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Protection from Corona virus, if one keeps a picture of the spiritual amulet below, alleged as done by Sakya Trizin.
Recently, news has been circulating in Tibetan communities between 14-15 March stating that a monk from Gaden Jangtse has been infected with this pandemic COVID-19 or say CoronaVirus.