Wondering if the Naturium Vitamin C Serum has any acne-causing ingredients?
If your skin tolerates it well, this product shouldn't cause acne. It is a loaded formula though - in addition to a high concentration of vitamin C (ascorbic acid), it contains a number of plant extracts that can lead to an irritation, especially if your skin is sensitive. An irritant reaction can present itself with breakouts, and a sensitized skin is also more prone to acne. You might find this blog post about acne causing ingredients useful: https://whatsinmyjar.com/entries/134/ingredients-that-cause-acne