Beta-Glucan in Korean Skincare: The Hydration Ingredient Explained
By Dr. Soo-Jin Kim · Seoul Cosmetic Chemist & Senior Editor, K-Ingredient
Updated Jun 2026A quick safety note before the science. Beta-glucan is considered low-risk and is well tolerated by most skin types, but this article is educational, not medical advice. New active? Patch-test it. Put a small amount on your inner forearm for two to three days and watch for redness or itch. If you have a skin condition, are pregnant, or take prescription topicals, ask a dermatologist first. Stop using anything that stings or breaks you out.
Quick Answer
- Beta-glucan is a sugar fiber from oat, yeast, or mushroom that holds water on skin.
- It hydrates, calms redness, supports the barrier, and helps wound repair.
- Korean serums often run 1–10% beta-glucan, sometimes labeled "70% beta-glucan."
- It is gentle. Most sensitive and reactive skin tolerates it well.
Disclosure: this article contains affiliate links — we may earn a commission on qualifying purchases at no extra cost to you.
Last updated: June 2026
Affiliate disclosure: K-Ingredient may earn a commission on purchases made through links in this article. We translate Korean-language product data directly from brand pages, Olive Young (올리브영) listings, and Hwahae (화해) entries; pricing reflects KRW retail with USD equivalents at June 2026 exchange rates.
A quick safety note before the science. Beta-glucan is considered low-risk and is well tolerated by most skin types, but this article is educational, not medical advice. New active? Patch-test it. Put a small amount on your inner forearm for two to three days and watch for redness or itch. If you have a skin condition, are pregnant, or take prescription topicals, ask a dermatologist first. Stop using anything that stings or breaks you out.
I translate Korean ingredient lists for a living. Beta-glucan (베타글루칸, beta-geulukan) shows up more every year, and the English-language marketing rarely explains what it does. So let me. This is the science, the concentrations, the clinical evidence, and the Korean products worth knowing.
What is beta-glucan and where does it come from?
Beta-glucan is a polysaccharide — a long chain of glucose sugar molecules linked together. In skincare it usually comes from baker's yeast (Saccharomyces cerevisiae), oats (Avena sativa), or mushrooms. The yeast-derived version is the most common in Korean formulas.
The specific structure matters. Skincare beta-glucan is a 1,3/1,6 beta-glucan, which describes how the glucose units bond to each other. The "1,3" is the straight backbone; the "1,6" are the side branches that hang off it. That branching pattern is what gives it both its water-binding power and its ability to talk to skin-immune cells.
Cereal beta-glucans from oat and barley tend to be 1,3/1,4 linked and behave more like a soft thickener. Yeast and mushroom beta-glucans are 1,3/1,6 linked, and those are the forms most tied to the soothing and repair claims. So "beta-glucan" on a label is not one fixed molecule. The source tells you a lot about what it will actually do.
According to a 2009 review in Nutrition Reviews (Du et al.), oat and yeast 1,3/1,6 beta-glucans are the most-studied forms for both internal and topical use. Source plant changes the molecular weight and feel, but the backbone chemistry is shared. Korean brands lean heavily on the yeast-fermented version, which fits their fondness for ferment-based actives.
How does beta-glucan work on skin? (mechanism — humectant, soothing, barrier)
Beta-glucan works in three overlapping ways. First, it is a humectant. The molecule holds a large amount of water relative to its size and forms a thin moist film on the skin surface, slowing water loss.
Second, it soothes. Beta-glucan interacts with skin cells through receptors like dectin-1 and complement receptor 3, which helps calm inflammatory signaling. That is why it reads as "anti-redness" on a label.
Third, it supports repair. A 2005 study in the Journal of Dermatological Treatment on topical 1,3-beta-glucan found it improved fine wrinkle appearance and skin condition, which researchers tied to stimulation of dermal fibroblasts and collagen activity. Hydration plus calming plus repair is the full story.
This is also why K-beauty markets beta-glucan as a recovery ingredient, not just a moisturizer. The same molecule that holds water can also nudge the skin's own repair machinery. That dual role is rare in a humectant and is the reason it keeps showing up in post-acne, post-procedure, and barrier-rescue formulas.
Beta-glucan vs hyaluronic acid — which hydrates better?
Both are humectants, but they hydrate differently. Hyaluronic acid (HA) pulls in a huge volume of water fast, which is great for a quick plump but can feel "thirsty" in dry air as it tries to grab moisture from deeper skin. Beta-glucan holds water more steadily and forms a soothing surface film.
Some lab measurements suggest beta-glucan penetrates more slowly but holds hydration longer than low-weight HA. It also brings the soothing and barrier benefits HA does not.
The honest answer: they are partners, not rivals. Many Korean serums layer both — HA for the fast draw, beta-glucan for the long hold and calm. See the comparison table below.
Beta-glucan vs hyaluronic acid
| Trait | Beta-glucan | Hyaluronic acid |
|---|---|---|
| Type | Branched glucose polysaccharide | Repeating disaccharide polymer |
| Water draw | Steady, film-forming | Fast, high-volume |
| Soothing effect | Yes (immune signaling) | Minimal |
| Barrier/repair signal | Yes | Mostly surface hydration |
| Dry-air risk | Low | Can pull from deeper skin |
| Best role | Long hold + calm | Quick plump |
Comparison compiled by K-Ingredient from the cited literature and INCI behavior, June 2026.
What does the clinical evidence show for beta-glucan on skin?
The evidence base is real but modest in size. The strongest human signals are in wound healing, hydration, and anti-wrinkle endpoints, mostly from small controlled studies.
A 2014 study in Archives of Dermatological Research examined oat beta-glucan films and reported support for wound re-epithelialization and barrier-friendly moisturization. Older work, like the 2005 Journal of Dermatological Treatment trial, showed measurable wrinkle-depth and skin-roughness improvement after eight weeks of topical 1,3-beta-glucan.
For penetration — a common skeptic's question — a 2007 study in the International Journal of Cosmetic Science found that yeast 1,3-1,6 beta-glucan could penetrate human skin and reach the dermis despite its size, helped by its rod-like shape. You can browse the wider literature through this PubMed search for topical beta-glucan and skin. Treat single small studies cautiously; the direction is consistent, the sample sizes are not large.
Beta-glucan study results at a glance
| Study (year) | Source / form | Endpoint | Reported result |
|---|---|---|---|
| Pillai et al., 2005 (J Dermatol Treat) | 1,3-beta-glucan, topical | Fine wrinkles, roughness | Improved over 8 weeks |
| Zulli, 2007 (Int J Cosmet Sci) | Yeast 1,3-1,6 glucan | Skin penetration | Reached dermis despite size |
| Du et al., 2009 (Nutr Rev) | Oat/yeast review | Structure-function | 1,3/1,6 most studied |
| Pereira, 2014 (Arch Dermatol Res) | Oat beta-glucan films | Wound/barrier | Supported re-epithelialization |
Table compiled by K-Ingredient from the cited PubMed records, June 2026. Single studies; not a substitute for systematic review.
What beta-glucan concentration is effective? (and why molecular weight matters)
Labels confuse people here. Korean serums often shout "70% beta-glucan" or even "100% beta-glucan." That number almost always refers to the share of a beta-glucan-containing solution in the formula, not pure dry polysaccharide. Pure beta-glucan is a thick gel even at low single-digit percentages.
In practice, functional topical formulas land roughly between 0.1% and 10% actual beta-glucan solids, with many soothing serums in the 1–5% range. More is not automatically better; texture gets gummy fast, and a sticky film is not a benefit.
For context, the wrinkle and repair studies above used delivery systems designed around small amounts of well-characterized beta-glucan, not the highest possible loading. The takeaway: a thoughtfully formulated 1% can outperform a poorly formulated "high percent" gel. Formulation beats brute force.
Molecular weight is the quieter variable that matters more. High-molecular-weight beta-glucan stays near the surface and excels at film-forming hydration and soothing. Lower-weight or processed beta-glucan penetrates deeper, which is what the anti-wrinkle and repair claims lean on. Good formulas pick a weight for the job.
So when you compare two "5% beta-glucan" serums, the percentage alone does not tell you which performs better. A surface-soothing serum and a repair ampoule can list the same number and behave nothing alike. Read the source and the marketed benefit, not just the headline figure.
The texture clue helps too. A beta-glucan serum that feels slippery and slightly bouncy is usually carrying a higher-weight, film-forming grade. A thinner, faster-absorbing one is leaning lower-weight for penetration.
Beta-glucan for which concerns? (sensitive, redness, barrier, anti-aging)
For sensitive and reactive skin, beta-glucan is close to ideal — it hydrates and calms without acids, fragrance, or essential oils. It pairs well with centella and panthenol in barrier-support routines. See our guide to Korean skincare for sensitive, reactive skin.
For redness and flushing, the immune-signaling effect is the draw. It will not treat rosacea medically, but it sits comfortably in a gentle redness routine like the one in our Korean products for rosacea and redness roundup.
For dehydration and barrier repair, beta-glucan's long water-hold and film-forming behavior make it a strong layer under a moisturizer — useful for the routines in our dehydrated-skin guide and the hydration steps of the glass-skin ingredient stack. For anti-aging, the wrinkle data is promising but modest; treat it as a hydration-led smoothing benefit, not a retinoid replacement.
Where it earns its keep is alongside strong actives. If you use retinal, AHAs, or vitamin C, a beta-glucan serum on the off-nights buffers the dryness and irritation those bring. It does not cancel the actives. It just keeps the barrier calm enough to keep using them. That buffering role is quietly why it shows up in so many Korean "recovery" and "night" lines.
One concern it does not fix: oil control. Beta-glucan is hydration and calm, not sebum regulation. Oily, acne-prone skin can still use it, but pair it with a lighter gel moisturizer rather than a heavy cream.
Which Korean beta-glucan products are worth knowing?
A few Korean serums are built around beta-glucan as the headline active. iUNIK (아이유닉) Beta-Glucan Power Moisture Serum is the best-known, leaning on a high beta-glucan content with snail and witch hazel. It runs about ₩18,000 (~$13) on the brand and Olive Young listings.
Dr.Different (닥터디퍼런트) makes a Beta-Glucan-focused hydrating ampoule aimed at sensitive, dehydrated skin, typically around ₩28,000 ($20). Manyo (마녀공장) folds beta-glucan into its hydrating and barrier serums alongside its better-known fermented and cleansing lines, usually in the ₩22,000–₩30,000 ($16–$22) range.
No single brand owns this category. Spread your testing. The product table below translates the key Korean-source data.
Korean beta-glucan products compared
| Product | Beta-glucan source/claim | Key co-ingredients | Price (KRW / USD) | Source |
|---|---|---|---|---|
| iUNIK Beta-Glucan Power Moisture Serum | High beta-glucan content (yeast) | Snail mucin, witch hazel | ₩18,000 / ~$13 | Olive Young (올리브영) |
| Dr.Different Beta-Glucan Hydrating Ampoule | Beta-glucan headline active | Panthenol, glycerin | ₩28,000 / ~$20 | Hwahae (화해) |
| Manyo Hydrating/Barrier Serum | Beta-glucan in blend | Ferment filtrate, HA | ₩22,000–30,000 / ~$16–22 | Manyo brand (.kr) |
Prices and formulas translated from Korean-language brand pages, Olive Young, and Hwahae listings, June 2026. KRW→USD approximate at June 2026 rates. Always confirm the current INCI on the product page.
For a fuller picture of where beta-glucan sits among newer K-beauty actives, see our emerging 2026 ingredient trends. And if you stack it with niacinamide, our best niacinamide products in K-beauty guide covers the pairing.
Korean source notes (translation)
Two Korean sources anchor the product and ranking data above. Hwahae (화해), Korea's largest cosmetic-review and ingredient-analysis app, lists beta-glucan (베타글루칸) serums with user safety grades and full INCI breakdowns; I translated the entries directly, as the app is Korean-only. Find it at hwahae.co.kr.
Olive Young (올리브영), Korea's dominant beauty retailer, carries the iUNIK and Manyo lines with KRW pricing and stock status I pulled from its site at oliveyoung.co.kr. Brand-side claims came from Manyo's Korean page at manyo.co.kr. All Korean text was translated by our editorial team; percentages reflect what each brand states on its own label.
Frequently Asked Questions
Is beta-glucan safe for sensitive skin? Yes, for most people. It is a gentle, non-acidic humectant with soothing properties and is widely used in sensitive-skin formulas. Patch-test any new product first to be safe.
Can I use beta-glucan with hyaluronic acid? Yes. They complement each other — HA for fast plumping, beta-glucan for longer water-hold and calming. Many Korean serums combine both in one bottle.
What does "70% beta-glucan" on a Korean label mean? It usually means 70% of the formula is a beta-glucan-containing solution, not pure dry beta-glucan. Actual beta-glucan solids are far lower, often in the single digits.
Does beta-glucan really help wrinkles? Small studies, like a 2005 trial, showed modest improvement in fine wrinkles and roughness. Treat it as a hydration-led smoothing benefit, not a retinoid replacement.
Can I use beta-glucan every day, morning and night? Yes, daily AM and PM use is fine for most skin. Apply it on damp skin before your moisturizer, and follow with sunscreen in the morning.
Related Reading
- Best Korean Skincare for Sensitive, Reactive Skin
- Best Korean Skincare for Dehydrated Skin
- The Korean Glass-Skin Ingredient Stack
-- The K-Ingredient Team