A Beginner's Guide to Skincare Acids: Niacinamide, AHAs, and BHAs Explained

Niacinamide, AHA, BHA — skincare labels throw around acronyms like everyone already knows what they do. They don't need to be complicated. Here's what each one actually does, which real concern it solves, and how to use them together without irritating your skin.

Niacinamide: the everyday multitasker

Niacinamide is a form of vitamin B3, and it's one of the few active ingredients that's genuinely low-risk for almost every skin type. According to the British Association of Dermatologists, nicotinamide (niacinamide) is an anti-inflammatory ingredient that helps calm redness and swelling, and it's widely used to support the skin's barrier function and regulate oil production over time. It's a reasonable ingredient to use daily, morning or night. Beauty Formulas Illuminate Serum 10% Niacinamide is an easy, affordable way to add it to a routine without committing to anything complicated.

AHAs: glycolic and lactic acid for texture and dullness

Alpha hydroxy acids (AHAs) are water-soluble exfoliants that work on the skin's surface, dissolving the "glue" that holds dull, dead skin cells in place. Per Garnier UK, AHAs work on the skin's surface and suit dryness, dullness, or uneven tone, while BHAs are oil-soluble and better suited to congestion and breakouts. The Ordinary Glycolic Acid 7% Toning Solution is a well-known starting point, and The Ordinary Lactic Acid 10% + HA is a gentler AHA option if glycolic feels like too much at first.

BHA (and combining both): when congestion is the problem

Beta hydroxy acid (BHA, chemically salicylic acid) is oil-soluble, so it can get into the pore itself rather than just working on the surface — which is why it's the better pick for blackheads, congestion, and oily/acne-prone skin. If your concerns overlap — some dullness, some congestion — a combined formula like The Ordinary AHA 30% + BHA 2% Peeling Solution covers both in one step, though it's a stronger, occasional-use treatment rather than a daily product.

Always follow with hydration

Exfoliating acids work by encouraging skin to shed and renew faster, which can leave it more prone to dryness if you skip hydration afterward. A simple, fragrance-free hydrator like The Ordinary Hyaluronic Acid 2% + B5 after any acid step helps keep the skin barrier comfortable rather than stripped.

Building the routine without overdoing it

You don't need niacinamide, an AHA, and a BHA all in the same routine at the same time. A realistic starting point: niacinamide daily, one exfoliating acid two to three times a week (not every day), and hyaluronic acid whenever your skin needs the moisture back. Patch test anything new, and introduce one active at a time so you actually know what's working.

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