What's the difference between a serum and a moisturiser?

A serum is lightweight and concentrated, designed to target a specific concern. A moisturiser is richer and seals in hydration. Most routines benefit from both: serum first, moisturiser on top.

Can I use more than one serum?

Yes. Layer from thinnest to thickest and let each one sink in before the next. When you're starting out, introduce one new active ingredient at a time so you can see how your skin responds.

When should I use a retinol serum?

Use retinol in your evening routine. Start two or three nights a week and build up as your skin gets used to it, and always wear SPF during the day.

Can I use niacinamide and vitamin C together?

Yes. The idea that they cancel each other out comes from old studies using unstable formulas. Today's serums play nicely together. Here's how to layer them.

Should I use a face oil or a serum?

They do different jobs, so you don't have to choose. Serums deliver active ingredients, while face oils nourish and help lock in moisture. Use your serum first and your oil after.