And what you eat is vitamin C, which is a synthetic vitamin. The two effects are also much worse. Like natural vitamins, it has no side effects and many functions, such as whitening and diluting pigments and enhancing immunity.
Moreover, that kind of drug is an adjuvant therapy drug, so it is best not to take it often.
However, vitamin C is a water-soluble vitamin. As long as it is not used in large quantities for a long time, it is ok to take it when you have a cold, and it can also be used with desensitizing drugs when you are allergic. The effect is better.
Having said so much, I wonder if I have explained it clearly to you:)