It's on a tube of benzoyl peroxide that I'm using at the moment. Doesn't it seem strange, considering the two ingredients are so very different but can still be substituted for one another?
Answer:
Actually they aren't being substituted one for the other at all. When they produce a product for facial use, they have to adjust the final pH to match that of human skin. One or the other will be used depending on if the batch is alkaline or acid, to counter balance the entire batch. So either one or the other would have been used, but not both. If the batch was alkaline, they would likely have used the citric acid, and if it were acidic they would use the sodium hydroxide. It's not like you didn't have garlic powder so you used a clove of garlic. It's so you don't chemically burn your skin with a product that's too acid or too base.
Believe they both qualify as astringents or "pore reducers."
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