Gluconolactone (PHA)
The gentle PHA — helps smooth and refine skin with less sting than AHAs.
What it is
Gluconolactone is a polyhydroxy acid (PHA) — a larger, slower-acting cousin of AHAs. Because the molecule is bigger, it works more gradually and tends to sting less, which makes it a favorite for sensitive skin that finds glycolic or salicylic acid too harsh. It also has humectant and antioxidant qualities.
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Gentler does not mean "no rules" — it can still increase sun sensitivity, so daily SPF applies. Start a few times a week and build up. If you already use a strong AHA/BHA, you usually do not need to stack a PHA on top the same night.
Is PHA better than AHA or BHA?
Not better — gentler. PHAs like gluconolactone work more slowly and sting less, which suits sensitive skin. If your skin tolerates AHA/BHA and you want faster results, those still have their place.
Can sensitive skin use gluconolactone?
It is often the exfoliant of choice for sensitive skin because of the lower irritation. Still patch-test, start slow, and stop if it stings consistently.
Ingredients help the look and feel of skin; they do not treat medical conditions. No brand paid to be here. Skincare information, not medical advice — for a persistent concern, see a board-certified dermatologist.