Does vitamin C really keep you from catching a cold?

The orange-juice shield is mostly a myth - the colds still come.

Across large trials, taking vitamin C every day did not lower how often ordinary people caught colds. It did shave the average cold a little shorter, about 8 percent in adults, but only for those already taking it daily. Swallowing a big dose once you feel sick does nothing reliable.

You feel a tickle in your throat and down three 1,000mg tablets from the pharmacy - the cold runs its full course anyway, because the pill works only as a daily habit, not a last-minute rescue.

Daily vitamin C will not stop a cold from coming; at best it ends a touch sooner, and dosing only after symptoms start does not help.

Knowing the limit saves you money on panic-buying supplements and steers you to rest and fluids, which actually help you recover.

Vitamin C is a slow daily helper, not a one-shot fix - the cold still knocks.

Learn the idea and practice English at the same time.