iUNIK Beta Glucan Serum review: a short-list alternative to hyaluronic acid
Updated October 22, 2026
iUNIK Beta Glucan Power Moisture Serum, 50ml is worth buying if you want a plain hydrating gel with a ten-ingredient list, no fragrance or essential oils, and no hyaluronic acid at all, for $12.99. It isn't a stronger version of a hyaluronic acid serum; it's a different humectant in a silkier gel, so choose it for the short list and the texture, and choose a hyaluronic serum if you prefer a thin, watery layer.
It makes the most sense for skin that still feels tight after toner but doesn't want a heavy serum, and for routines that already include an active such as retinol or vitamin C and just need a hydration step with nothing else going on. If you're looking for brightening, exfoliation or a targeted active, this bottle doesn't contain one.
This is a researched review of current US brand and retailer information, checked October 2026. We haven't worn or tested the serum; texture descriptions come from iUNIK and from our product page, and the buying advice comes from comparing formulas, directions, sizes and prices.
What you're buying: formula, size and price
The serum comes in one size, 50ml, at $12.99 at Sleepy Hello, checked October 2026. That works out to about 26 cents per ml, which is low for a single-step hydrating serum. iUNIK describes it as a silky, gel-type serum that absorbs quickly without stickiness and leaves skin fresh, dewy and comfortably hydrated.
The ingredient list is ten names long, but the two versions published in October 2026 don't agree on the order:
The ingredient list on our product page: Beta-Glucan (400,000ppm), Water, Glycerin, 1,2-Hexanediol, Butylene Glycol, Adenosine, Carbomer, Tromethamine, Sodium Polyacrylate, Sodium PCA.
iUNIK's own site (iunik.com): Water, Glycerin, 1,2-Hexanediol, Butylene Glycol, Adenosine, Tromethamine, Sodium PCA, Carbomer, Beta-Glucan (160,000ppb), Sodium Polyacrylate.
The ingredients are the same ten; the order and the beta-glucan figure are not. Formulas get revised and panels get reprinted, so the carton you receive is the final word; check it against both lists. Here is what each group is doing:
Beta-glucan. The ingredient the bottle is named for. Our product page lists it first at 400,000ppm, while iUNIK's site lists it ninth at 160,000ppb, which works out to about 0.016%. Neither source explains how its figure was measured, so we wouldn't read either number as a strength rating, and we wouldn't assume beta-glucan outweighs water in the bottle you get.
Glycerin, butylene glycol and sodium PCA. These are humectants, ingredients that draw water into the outer layer of skin and hold it there. Sodium PCA is one of the moisture-binding compounds skin produces on its own.
1,2-hexanediol. A glycol that's widely used to help keep water-based formulas stable.
Adenosine. A skin-conditioning ingredient; the product page says it helps skin look smoother.
Carbomer, tromethamine and sodium polyacrylate. The gel system. Carbomer thickens, tromethamine balances it so it sets into a gel, and sodium polyacrylate adds body. This trio is why iUNIK calls the texture a silky gel rather than a watery serum.
What isn't on either list matters as much for this product. There's no hyaluronic acid or sodium hyaluronate, no fragrance, no essential oils, no drying alcohol, no plant extracts and no silicones. Sleepy Hello's product page states the formula is free from added fragrance and essential oils, and both panels agree. iUNIK's site says its beta-glucan is mushroom-derived, without naming the species, and the brand doesn't publish a pH.
What does beta-glucan do in skincare?
Beta-glucan is a humectant: it attracts and holds water in the top layers of skin and leaves a thin, smooth film as it dries. Chemically it's a polysaccharide, a long chain of sugar units, which cosmetic suppliers extract from sources such as oats, yeast and mushrooms. iUNIK's is the mushroom kind.
That film is the part you'd notice in a serum. A beta-glucan gel tends to spread with some slip and settle into a smooth layer, which fits iUNIK's own description of a gel that absorbs without stickiness and leaves skin fresh and dewy.
Brands often describe beta-glucan as comforting, and our product page lists barrier care among this serum's benefits. On the label, though, its job here is hydration. It's one of four water-binding ingredients in a ten-ingredient formula, alongside glycerin, butylene glycol and sodium PCA.
It helps to be clear about what it isn't. Beta-glucan isn't an exfoliant, a brightener or a retinoid, and it won't change skin texture the way an acid does. What you're buying is the feel of moisturized skin and a smoother look while the layer is on, plus a calm base for whatever comes next.
Is iUNIK Beta Glucan serum better than hyaluronic acid?
It's an alternative, not a proven upgrade. Beta-glucan and hyaluronic acid are both sugar-chain humectants that hold water at the skin's surface, and both work best under a moisturizer that slows that water from evaporating.
The key-ingredient note on our product page says beta-glucan "retains moisture 20% better than hyaluronic acid," and iUNIK's own site says it's "clinically shown to outperform hyaluronic acid." Neither publishes how that was measured, at what concentrations or against which form of hyaluronic acid. We read both as raw-ingredient marketing comparisons, not as results for this bottle.
The real differences are texture and how much else is in the formula. Two hyaluronic serums we stock show the contrast:
Torriden Dive-In Low Molecular Hyaluronic Acid Serum, 50ml is $16.99 for 50ml, about 34 cents per ml. Its product page describes a watery texture that absorbs quickly. Its list carries five forms of hyaluronic acid (hydrolyzed hyaluronic acid is labeled at 500ppm) plus panthenol, allantoin, madecassoside and ceramide NP. It also contains beta-glucan, much further down the list.
COSRX The Hyaluronic Acid 3 Serum, 20ml is $16.99 for 20ml, about 85 cents per ml. It declares 3% sodium hyaluronate, adds amino acids and ceramide NP, and the list includes dimethicone (a silicone) and a small amount of alcohol near the end.
Our take: pick iUNIK if some hyaluronic serums have felt tacky on you, if you want the shortest list you can find, or if price per ml matters most. Pick the Torriden if you'd rather have a watery layer that also carries panthenol and ceramide in one step. Pick the COSRX if you want a declared hyaluronic acid percentage in a small bottle and don't mind a silicone.
You don't need a beta-glucan serum and a hyaluronic serum in the same routine. One humectant serum under a moisturizer covers the job; stacking two mostly adds another layer to wait for.
How do you use iUNIK Beta Glucan Power Moisture Serum?
Smooth a small amount over your face after toner, pat it in, and follow with moisturizer, morning and evening. iUNIK's own direction is a single line: after toner, apply an appropriate amount and pat gently to help it absorb. Our product page fills in the rest of the order:
Cleanse, then apply your toner.
While skin is still slightly damp, smooth a small amount of serum over the face and gently pat until absorbed. The product page notes that slightly damp skin can make the gel easier to spread.
Let the gel settle for a moment before the next layer.
Follow with moisturizer.
In the morning, finish with sunscreen, and let each layer settle before makeup.
Neither source gives a drop or pump count. iUNIK says "an appropriate amount" and the product page says a small amount, and a gel spreads further than you might expect, so start with less and add a second thin layer on drier areas if they still feel tight.
In a routine it's the hydration step between toner and cream. The product page suggests normal, combination and oilier skin can use it, describing the finish as plump and fresh rather than oily; on oily skin it can pair with a light gel moisturizer. Dry skin will still want a proper cream on top, since a humectant gel holds water best when something seals it in.
If you want a matching cleanser, the iUNIK Centella Bubble Cleansing Foam, 150ml is $12.99 but was out of stock when we checked in October 2026. It's a pump foam with sulfate-free surfactants and centella leaf water first on its list. Unlike the serum, its ingredient list declares fragrance, which is worth knowing if you're choosing products for reactive skin.
Is iUNIK Beta Glucan serum good for sensitive skin?
It's one of the easier serums for sensitive skin to read: the list is ten ingredients long and contains none of the extras covered in the formula section above. That doesn't guarantee your skin will tolerate it, but it leaves very few places for a problem ingredient to hide. iUNIK's site also says the formula is free from 26 common allergens, though it doesn't list which ones.
If you already know a specific ingredient bothers you, check it against the ten names above; with a list this short, that takes a few seconds. If you're new to the product, apply it to a small area such as the jawline for a few days before using it all over, and stop if it stings or itches.
For skin that reacts often, the routine around the serum matters as much as the serum itself. A gentle cleanser, a moisturizer you already know suits you and daily sunscreen do more than any single hydrating step. Introduce one new product at a time so you can tell what caused a change. Our Korean skincare for sensitive skin guide covers how to build that routine.
Can you use iUNIK Beta Glucan serum with retinol or vitamin C?
Yes. Nothing on its list is a retinoid, an acid or vitamin C, so it adds hydration without doubling up on actives, which makes it an easy partner for both.
With vitamin C (morning). Apply the vitamin C serum to clean skin as its directions say, let it settle, then the iUNIK serum, moisturizer and sunscreen.
With retinol (evening). Follow your retinol's own directions first. If it asks for dry skin, apply the retinol, wait, then add the iUNIK serum and moisturizer. If the directions allow a hydrating layer underneath, the iUNIK gel can go on first instead.
With exfoliating acids. The same rule applies: the active goes on as directed, and the beta-glucan serum is the hydration layer that follows. Keep strong acids and retinol on separate nights unless a product's directions say otherwise.
Does iUNIK Beta Glucan serum contain hyaluronic acid?
No. Neither published version of the ten-ingredient list includes hyaluronic acid or sodium hyaluronate. Its water-binding ingredients are beta-glucan, glycerin, butylene glycol and sodium PCA.
Is iUNIK Beta Glucan serum fragrance-free?
Yes, going by the ingredient list. Neither panel includes fragrance or essential oils, and our product page states the formula is free from both.
Is iUNIK Beta Glucan serum good for oily skin?
It can be. iUNIK describes a silky gel that absorbs quickly without stickiness and leaves skin fresh and dewy, and the formula contains no oils or butters. Follow it with a light gel moisturizer if a cream feels like too much.
How long does a 50ml bottle last?
iUNIK doesn't say. Used morning and evening in a thin layer, a 50ml gel goes a long way, but how long depends on how much you apply and whether you use it twice a day.
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