Match the ingredient to the concern

Serums are concentrated treatments, and the label buzzwords map to specific jobs. Choosing by concern — dullness, oiliness, dehydration — beats choosing by popularity.

Vitamin C: brightening and antioxidant protection

Best for dull tone, dark spots and preventing environmental damage. Use it in the morning under sunscreen. Look for 10–20% L-ascorbic acid, or gentler derivatives if your skin is sensitive, and buy opaque, airtight packaging — vitamin C oxidizes quickly.

Niacinamide: pores, oil and redness

A well-tolerated multitasker that regulates sebum, reduces redness and strengthens the skin barrier. Concentrations of 4–5% do the job; higher percentages add irritation risk faster than they add benefit.

Hyaluronic acid: hydration, not oil

A humectant that binds water to the skin — it plumps dehydrated skin of any type, including oily. Apply it to slightly damp skin and seal with moisturizer, or it can pull moisture out instead of in.

Can you combine them?

Yes — niacinamide and hyaluronic acid pair with almost everything. A simple split: vitamin C in the morning, hydrating and barrier ingredients at night.