Ingredient dictionary

Gluconolactone

Also listed as: Glucono delta-lactone

Gluconolactone is a mild, sugar-derived ingredient, the lactone form of gluconic acid, that mainly helps hydrate skin and hair and gently loosen dead skin cells. It is on the label of 15 products in our library. Checked against our library November 6, 2026.

The catch: none for most people; check the full product list if your skin reacts easily.

What Gluconolactone does

Draws water into the skin
Gently loosens dead skin cells
Binds metal ions in formulas

Gluconolactone is made from glucose, the simple sugar, usually through fermentation. Its structure is a ring-shaped form of gluconic acid, and in water it slowly opens back up into that acid. Because of this, it behaves like a mild acid that acts more slowly than many others.

Formulators use it for a few reasons. It attracts water, so it helps products hold moisture in the skin. It also binds metal ions that could affect stability, and it helps keep pH steady. It dissolves easily and usually feels light, without a heavy or sticky finish.

Good for

Suits everyday lotions and shampoos, and people with sensitive or dry skin who want a gentle hydrating boost.

Be careful if

Nothing in particular for most skin types.

Frequently asked questions

Is gluconolactone good for sensitive skin?

It is generally considered one of the gentler acid-type ingredients, since it releases its acid slowly. Many people with sensitive skin tolerate it well. As with any new product, patch testing on a small area first is a sensible habit.

Is gluconolactone in baby lotion safe?

It is one of the milder ingredients found in many baby lotions and washes, and it is used to help hydrate skin. Parents should still read the full label and follow the product directions. If redness or irritation appears, stop using the product and ask a pediatrician for advice.