Question 1

Can I use retinol and AHA together?

Accepted Answer

Generally no, both increase cell turnover and using them at the same time often causes irritation. Use retinol at night and AHA on alternate evenings, or split AM/PM.

Question 2

Can I use vitamin C and niacinamide together?

Accepted Answer

Yes. Modern formulations are stable together and recent research shows no meaningful interaction. The old myth came from impure 1960s vitamin C.

Question 3

Can I use retinol and vitamin C together?

Accepted Answer

It works for many people but can irritate sensitive skin. Safer split, vitamin C in the morning, retinol at night.

Question 4

Can I use AHA and BHA together?

Accepted Answer

Possible but often too much exfoliation. Start with one type, or alternate days.

Question 5

Can I use benzoyl peroxide with retinol?

Accepted Answer

Apply at different times of day. Benzoyl peroxide can oxidise some retinoids if applied together.