What Is PHA? The Gentle Exfoliant Sensitive Skin Loves

PHA (polyhydroxy acid) is a gentle chemical exfoliant that smooths and brightens skin without the irritation associated with stronger acids. The most common PHAs — gluconolactone and lactobionic acid — have larger molecules than AHAs like glycolic acid, so they work gradually on the skin's surface rather than penetrating deeply. The result: fresher, more even-toned skin with virtually none of the stinging, redness, or dryness that keeps sensitive skin types away from exfoliating acids.

How PHAs actually work

Like their AHA cousins, PHAs loosen the bonds holding dull, dead cells to the skin's surface so they can shed naturally. The difference is pace. Because PHA molecules are larger, they can't rush past the outermost layer — exfoliation happens slowly and evenly, which is precisely why dermatologists often suggest them for reactive, rosacea-prone, or freshly-repaired skin.

PHAs also bring two bonuses most exfoliants don't. They're humectants, meaning they draw water into the skin while they work — exfoliation and hydration in the same step. And they have antioxidant properties that help defend against the environmental stressors behind fine lines and uneven tone.

PHA vs. AHA vs. BHA

AHAs (glycolic, lactic) are water-soluble and fast-acting — great for visible texture and tone, but the most likely to irritate. BHAs (salicylic acid) are oil-soluble and travel into pores, making them the choice for congestion and breakouts. PHAs sit at the gentle end of the spectrum: surface-level, gradual, hydrating, and the least likely to trigger sensitivity — with less of the sun-sensitivity concern of stronger AHAs (though daily SPF is still non-negotiable with any exfoliating acid).

Who should reach for PHA?

PHAs are the answer when you want glow but your skin pushes back. They're especially suited to sensitive and reactive skin, dry or dehydrated skin that finds most acids stripping, anyone rebuilding a compromised skin barrier, and exfoliation beginners who want results without a learning curve of redness.

How to add PHA to your routine

Start two to three evenings per week after cleansing, and let your skin tell you when it's ready for more. PHAs layer politely with most ingredients — including peptides, niacinamide, and hyaluronic acid — and are one of the few exfoliants gentle enough to sit in a routine alongside retinol alternatives like bakuchiol. Finish every morning with SPF.

PHA picks we carry

Our edit of PHA skincare is intentionally small — gentle, effective formulas we'd put on our own skin. The Eminence Pineapple Refining Tonique pairs PHA with tropical enzymes for a daily-glow toner that refines without stripping, while the Eminence Yuzu Solid Body Oil brings PHA below the chin, smoothing rough, dry areas while it nourishes.

PHA, answered quickly

Is PHA safe for everyday use? Many people work up to daily use, but start with two to three times per week and increase gradually.

Can I use PHA with retinol? Generally yes — PHA is one of the most retinol-compatible exfoliants — but introduce them on alternate nights first.

Does PHA help with aging skin? Yes. Gradual exfoliation plus hydration plus antioxidant support softens the look of fine lines and dullness over time.

Is PHA better than AHA? Not better — gentler. If your skin tolerates glycolic or lactic acid well, an AHA may work faster. If it doesn't, PHA gets you to the same glow without the detour through irritation.

Unsure where exfoliating acids fit in your routine? Visit us at Southcentre Mall for a complimentary consultation, or explore the full PHA collection online.