Emergen-C is a supplement which means its does not have to pass any safety testing. Also there is a misconception being propagated that ascorbic acid is Vitamin C when in reality it is not and actually ascorbic acid is claimed to have multiple negative health side affects. With no research and no testing however, we are left to just trusting the company selling the product.. Learn more here : Popular but Dangerous: The truth about Emergen-C Packets and here: What’s wrong with Ascorbic Acid?
