I take Vitamin C when I have a cold. It's a great in food and dietary supplements. How about you?
I usually do take it when I have a cold. I try to take some every day but forget sometimes
Good call! There is evidence it helps shorten the length of colds!
Has there been a lot of studies on it?
I'm not sure, I assume so! It's an essential nutrient involved in repairing tissue and enzymatic production.
Do you know the best foods to get vitamin C from? I know oranges for sure
, and strawberries. Prolonged storage or cooking may reduce vitamin C content in foods. 
Biology.
Biology Significance.
Vitamin C is an essential nutrient for certain animals including humans. The term "vitamin C" encompasses several vitamers that have vitamin C activity in animals. Ascorbate salts such as sodium ascorbate and calcium ascorbate are used in some dietary supplements. These release ascorbate upon digestion. Ascorbate and ascorbic acid are both naturally present in the body, since the forms interconvert according to pH. Oxidized forms of the molecule such as
"Turkestan salt is another thing I require. I need it when I take Cold-Food Powder."; and a lament over their 26-year separation says, "Of late, I have been missing you more than I can say. I have been taking Cold-Food Powder for a long time, but I am still weak."
The Jin Dynasty Daoist scholar Ge Hong's (c. 320) "Baopuzi" ("[Book of the] Master Who Embraces Simplicity") contains invaluable details about the