I received a lot of question regarding this issue
The simple answer would be, no- vitamin c injection has no complication if it is being done correctly and done by doctors
In our country only doctors are allowed to do intravenous injection. Not even head of nurses of malaya.
Vitamin c injection is basically the same as the vitamin c tablet as u could buy from ur local pharmacy or even at kedai mamak nowadays. It has the same function. But different concentration and onset. Definitely if u take the injection, the dose is higher and the effect is a lot better compared to the tablet.
Same situation in the hospital, we use injection for antibiotic , instead of tablet for better action and rapid onset.
What are the benefit of vitamin c ? Plenty ... Go google in the wikipedia. But most people take vitamin c injection for cosmetic purpose, to make their skin more radiance and prettier ... Which is proven and works miracle for some reason.
Nevertheless, as any other injection... If the injection is not done properly, there are many complication. U could have infection, skin irritation, inflammation ... Hence forward... If u want to do any kind of injection... Ask a doctor to do it for u....