Many people use vitamin C serum daily, but there is no single rule for every skin type, and strength and formulation vary between products.
Patch test first
Apply a small amount to a discreet area and wait to see if irritation develops before using it on your face.
Build up gradually
Start every second day and increase if your skin stays comfortable. Stop if you notice stinging, redness or tightness.
Always use sunscreen
Sun protection is the habit with the strongest evidence behind it. The NHS advises SPF 30 or higher with at least 4-star UVA protection.
Ask if unsure
If you have sensitive skin, a skin condition or are pregnant, ask a pharmacist, doctor or dermatologist before adding active products.
Source: NHS: Sunscreen and sun safety.
For more beauty and style ideas, browse the shop.