Vitamin C for Combination Skin, Simplified

Combination skin is the awkward middle child of skincare: a shiny T-zone and dry, sometimes flaky cheeks on the same face. Vitamin C can brighten and even out both, as long as you pick the right form and keep the routine simple.

Why combination skin is tricky

A single product rarely suits the whole face. Something rich enough for the cheeks can feel greasy on the nose; something matte enough for the T-zone can leave the cheeks tight. The goal is a lightweight active that treats the shared concern, dullness and uneven tone, without tipping either zone out of balance.

Pick the right form and strength

Pure vitamin C (L-ascorbic acid) is the most studied and works well at 10 to 15 percent, but it can sting reactive skin and needs careful storage. Gentler derivatives such as sodium ascorbyl phosphate or magnesium ascorbyl phosphate are more stable and less irritating, which suits the dry cheeks of combination skin.

• New to actives or easily irritated: start with a derivative at a lower strength.
• Tolerant skin chasing faster brightening: L-ascorbic acid at 10 to 15 percent.
• Very oily T-zone: a water-based serum layers better than an oil-based one.

How to layer it

Use vitamin C in the morning on clean skin, before moisturiser. Then finish with sunscreen every single day, no exceptions. Vitamin C and daily SPF are a genuine team: the antioxidant helps defend against daytime damage, and sunscreen protects the brightening progress you are building.

Store the bottle somewhere cool and dark, and keep the cap closed. If your vitamin C has turned deep orange or brown, it has oxidised and lost most of its potency, time to replace it.