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Gluconolactone

What Gluconolactone is & what it does

A polyhydroxy acid that gently exfoliates while also hydrating and offering antioxidant benefits, with very low irritation. It suits sensitive skin and is popular as a milder alternative to AHAs.

What is Gluconolactone and what does it do in sunscreen?

Gluconolactone is a polyhydroxy acid (PHA) that gently exfoliates while also drawing in water and offering some antioxidant benefit. In a sunscreen it smooths and hydrates with very low irritation, which is why it is popular as a milder alternative to AHAs. It is well suited to sensitive skin that finds glycolic or lactic acid too stinging.

Is Gluconolactone safe?

Yes. Gluconolactone is a well-tolerated cosmetic ingredient with a strong record of low irritation, and the same molecule is also used as a food additive (E575). Because its larger molecule penetrates more slowly than smaller AHAs, it tends to be gentler and less likely to sting. As with any exfoliating acid, daily sunscreen use is still sensible.

Does Gluconolactone clog pores?

Generally no. It is a water-loving acid rather than a heavy oil or wax, and it is used in small amounts, so it is considered low risk for clogging pores. If anything, gentle exfoliation can help keep pores clear. Breakouts are far more likely to come from the richer emollients elsewhere in a formula.

Is Gluconolactone an AHA?

No, it is a polyhydroxy acid (PHA), a close cousin of AHAs. It works in a similar exfoliating way but its larger molecule sinks in more slowly, which makes it gentler and less irritating. That is why it is often chosen for sensitive or reactive skin.

Is Gluconolactone vegan?

Yes, it can be. Gluconolactone is typically made by fermenting glucose, a plant sugar, so the standard cosmetic grade contains no animal-derived material. If strict vegan sourcing matters to you, the brand can confirm its specific supply.

Sunscreens with Gluconolactone

We rate 159 sunscreens that contain it, showing the top 10 by overall score:

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