Product placement
Trader Joe's Vitamin C Serum: acts - it is applied to the face as part of a skincare routine, and the video discusses its benefits and price point. Removing it would change the video's topic and demonstration. SkinCeuticals C E Ferulic: appears - it is mentioned as a comparison product, but its interface is not operated, nor does it generate a visible result in this video. Removing it would change the context of the comparison but not the core demonstration.