Skin Guides

Can you use AHA and BHA together?

You can buy them together. Your barrier votes no on wearing them together.

Short answer: Usually not in the same routine. Two exfoliating acids in one sitting is more than most skin needs, and over-exfoliation shows up as redness, tightness, and rough texture, the very things you were exfoliating to fix. Pick one per routine, or alternate them on different nights.

What each one does

AHAs (glycolic, lactic, mandelic) are water-soluble and work at the surface: texture, glow, the look of fine lines. BHA (salicylic acid) is oil-soluble, so it can travel into pores: congestion, blackheads, oily-skin maintenance. Different tools, genuinely different jobs.

Choosing yours

Congestion and oil lean BHA. Dullness and texture lean AHA. Dry or sensitive skin leans lactic or mandelic (gentler AHAs), or a PHA, the gentlest option of all. If you honestly want both benefits, you still only need one per night.

Using both without trouble

Alternate nights: BHA on Monday, AHA on Thursday, nothing exfoliating in between.
Zone it: some people use BHA only on an oily T-zone and AHA elsewhere, one thin layer each, never stacked on the same patch.
Watch frequency more than strength: two or three exfoliating nights a week total, counting every acid, scrub, and peel pad you own.

The recovery rule

If your skin ever becomes shiny-tight, stings under plain moisturizer, or flushes at nothing, you have found your over-exfoliation line. A week of cleanser, ceramide moisturizer, and sunscreen only, then reintroduce one acid at a lower frequency.

Common questions

What about products that combine AHA and BHA in one formula?

Combination formulas are dosed to be used as a single product, which is different from layering two full-strength products yourself. Even so, they count as your one exfoliating step that night.

Can I exfoliate the same night I use retinol?

Best not to. A retinoid plus any exfoliating acid in one routine is usually too much for the barrier. Alternate nights instead.

How often should I exfoliate?

For most skin, two to three nights a week is the sweet spot. Daily exfoliation is rarely necessary and frequently regretted.

Selv checks this for you.

A free iPhone app that knows the right order for your routine and warns you when ingredients clash. No account needed, nothing to buy, and without an account nothing leaves your phone.

This guide is general cosmetic information, not medical advice, and it cannot account for your skin, allergies, or prescriptions. If you use prescription products, your prescriber's directions override anything here. Full terms and medical disclaimer.