How do I fit this serum properly into my daily skincare routine?

Serums are applied after cleansing and toning but before moisturiser. This is the standard order, in which the active ingredients penetrate the skin better without meeting a barrier of a denser texture. A few drops or a small amount of the product are spread over the face with light patting movements, avoiding the eye area unless the instructions say otherwise.

Vitamin C in cosmetics is most often recommended for use in the morning: it works as an antioxidant and helps the skin cope with environmental exposure during the day. For morning use, it is important to finish the routine with sunscreen. This is a general recommendation for any product with active ingredients, since some forms of vitamin C can increase the skin's sensitivity to ultraviolet light.

Evening use is also possible and suits those who prefer a richer evening routine. In that case it is better not to combine the serum at the same time with acids or retinol if you are unsure how your skin will react, as such combinations can cause irritation.

Since the specific form of vitamin C is not stated in the public description (the full ingredient list is on the packaging), it is sensible to apply the product to a small area of skin on first use and wait 24 hours, especially if your skin tends to be sensitive.