What does C mean in ingredients?

Excuse me, could you please clarify what the letter "C" stands for when it appears in a list of ingredients? I'm trying to understand the composition of a product and this abbreviation has me a bit confused. It's not uncommon for ingredient lists to use abbreviations, but I'm not familiar with "C" in this context. Could it represent a specific chemical, compound, or perhaps a category of ingredients? I'd appreciate any insight you could offer to help me better understand the labeling on this product.