Concentrated Facial Serums

Vitamin C appears in skincare in different forms, concentrations and product bases. A formula can also include other ingredients that influence its texture, stability and how it fits into a daily routine.

Do not judge a formula by the front-label claim alone. Check the complete ingredient list, directions and packaging information; introduce new active products gradually if your skin is sensitive.

Products called serums can be lightweight aqueous formulations, emulsions or oil-based preparations. They may differ markedly in viscosity and how they feel alongside a moisturiser.

Face oils are often applied in small amounts as part of a moisturising routine; some people prefer to use them after a water-based product. Follow the manufacturer's guidance and consider your own skin comfort rather than assuming more layers are always better.