First of all, I have to say that it is a dual-phase serum and contains oils, so it leaves a greasy texture and is not convenient for before leaving the house. The vitamin C content is not mentioned anywhere. This makes me suspicious about its whitening property, which, to be honest, I haven't noticed. However, it has a stunning citrus scent and freshness, does not cause irritation, leaves the skin smooth, and theoretically, if it has a sufficient amount of its ingredients, it will have good antioxidant action. I bought it to use in the morning, but due to its oily composition, I use it in the afternoon when I return from work. It would not be convenient for the nighttime routine either, as it does not go well with retinoids.