Also known as: Oat beta-glucan, yeast beta-glucan
What Is Beta-Glucan?
Beta-glucans are polysaccharides, long chains of glucose molecules, found in the cell walls of oats, barley, yeast and some mushrooms. The source changes the structure slightly, but in skincare they share two main qualities: they hold water well, and they have a reputation for calming skin that feels stressed.
As a humectant, beta-glucan forms a light film that helps the skin stay hydrated, similar in feel to hyaluronic acid. Many Korean serums and essences use it as the main hydrating ingredient, sometimes at high concentrations, for people who want both moisture and comfort in a single step. Oat-derived beta-glucan is also one of the components that make colloidal oatmeal so soothing.
Because it is gentle and lightweight, beta-glucan suits nearly every skin type, especially skin that is dehydrated and easily irritated, and it is a good fit for anyone managing a damaged barrier.
Beta-Glucan Benefits for Skin
- Hydrates the skin with a light, comfortable film.
- Helps calm the look of irritation and redness.
- Supports skin during recovery from harsh products or weather.
- Lightweight enough for oily and combination skin.
- Layers smoothly under moisturizer and sunscreen.
How to Use Beta-Glucan
Apply a beta-glucan serum or essence after cleansing and toning, on slightly damp skin, then follow with moisturizer. It can be used morning and night and is a calm, easy addition to any beginner routine.
It is a good pick for the nights between active treatments, giving skin hydration and comfort without anything that might sting. In the morning, a thin layer under moisturizer can help skin stay comfortable in air-conditioned or heated rooms. Beta-glucan also appears in sheet masks and toners, so you can choose whichever format fits your routine best.
Side Effects & Precautions
Beta-glucan is very gentle and rarely irritates. Anyone with a known sensitivity to the source, such as oats or yeast, may want to check the label and patch test first.
Beta-glucan serums can feel slightly tacky while they dry, especially at higher concentrations, and may pill if too much is layered under a silicone-rich sunscreen. Using a smaller amount, waiting a minute before the next step, or applying it at night can help. Like other hydrating ingredients, it is supportive rather than corrective: it will make skin feel more comfortable and look more supple, but it will not fade dark spots or clear breakouts on its own. Pair it with a moisturizer so the water it holds is not lost to dry indoor air, and keep active treatments in their own steps.
Frequently Asked Questions
Is beta-glucan better than hyaluronic acid?
Neither is strictly better. Beta-glucan adds a more noticeable soothing effect, while hyaluronic acid is focused on hydration. Many routines use both.
Where does skincare beta-glucan come from?
It is commonly derived from oats, yeast or mushrooms. The label often specifies the source in the ingredient name.
Is beta-glucan safe for sensitive skin?
Yes. It is considered one of the gentler hydrating ingredients and is often chosen specifically for sensitive skin.