Question 1

Can I use retinol and vitamin C together?

Accepted Answer

Retinol and vitamin C are generally not recommended together as both are potent actives that can cause irritation when combined. Use vitamin C in the morning and retinol at night.

Question 2

Can I use niacinamide with vitamin C?

Accepted Answer

Yes, niacinamide and vitamin C can be used together. The older concern about them forming niacin is largely debunked at typical skincare concentrations. They can even complement each other for brightening.

Question 3

Can I use AHAs and BHAs together?

Accepted Answer

Using AHAs and BHAs together can be very effective but also very irritating. It's generally safer to alternate them or use them at different times of day. Always use SPF when using either.

Question 4

What skincare ingredients should not be mixed?

Accepted Answer

Key combinations to avoid or use carefully: Retinol + Vitamin C (irritation), Retinol + AHAs/BHAs (over-exfoliation), Benzoyl Peroxide + Retinol (deactivates retinol), multiple strong actives at once.

Routine Compatibility