Vitamin C ( worried about high dosage )

I am a little bit worried about taking high doses of Vitamin C after reading most of it is made cane of Sugar or corn syrup. I am not clear if the supplement itself contains sugar.

Vitamin C is a Sugar acid, so I don't know if it can be counterproductive if we are battling an active fungal overgrowth, at least in the first phase.

What do you think ??

Jorge