Unless you have any reason to suspect the delivery mechanism affects anything significant, this is exactly the same...

In this case, the vitamin C amounts need to be really high. Your body can't handle those amounts from oral intake.

Listen, you don't have to take my word for it. Just look up the little research that is done on it, and make sure you make a distinction between oral intake and injections.

I'm not condoning it as a cure, but you can absorb large amounts of vitamin C orally if you combine it with a lecithin. It's called liposomal Vitamin C.