I'm sorry, but I'm not talking about Vitamin C. The chemical name for Vitamin C is Ascorbic Acid. Citric Acid is used in various foods like sodas to add sourness and has no nutritional value that I am aware of. It is also sometimes used in home brewed beer or wine, and therefore can often be found in powdered form in stores catering to that hobby. This is how I obtained a bottle of powdered Citric Acid. I'm sure it is also available online for such use.