Vitamin C, also known as ascorbic acid and -ascorbic acid, is a vitamin found in food and used as a dietary supplement. As a supplement it is used to treat and prevent scurvy. Evidence does not support use in the general population for the prevention of the common cold. It may be taken by mouth or by injection.
Vitamin C tablets cannot be swallowed.
In order to take something by mouth you must swallow it. The system did not understand this.