Yes Emergen C does help with colds and helps ease the cold symptoms.
The Emergen C cannot cure a cold or make the cold virus go away any faster but taking Emergen C as soon as you start experiencing symptoms of the cold virus can help you feel better during the cold virus.
There's no cure for the cold as of now and likely there never will be any cures for the cold but the Emergen C medicine does help with the cold.
I notice I don't feel as bad with the cold virus if I take the Emergen C as soon as I start noticing I'm getting a cold.
So make sure to take the Emergen C as soon as you notice you're getting infected with a cold virus.
Then the symptoms won't be as severe and you'll feel much better and not as tired, fatigued etc while the cold virus goes away.