Naturium Quadruple Hyaluronic Acid Serum: what's in it and how to use it
Hyaluronic acid serums are the most common first "active" people buy, and Naturium's Quadruple Hyaluronic Acid Serum 5% is one of the US versions that circulates widely, including through resellers abroad. This guide reads its published ingredient list line by line, explains what "four molecular weights" actually means, and shows how to use a serum like this in a humid tropical city as well as in dry, air-conditioned air.
- The serum is a water-and-glycerin base with two forms of hyaluronic acid on the label: hydrolyzed hyaluronic acid and sodium hyaluronate. The brand describes four molecular weights within those.
- Hyaluronic acid is a humectant: it binds water. It does not exfoliate and it is not an acid in the sense of lactic or glycolic acid.
- The brand gives a formula pH of 5.85 to 6.5, which is mild, close to the skin's own slightly acidic surface.
- Apply to slightly damp skin, then seal with a moisturizer. In very dry air, the moisturizer matters more than the serum.
How this guide was written: we did not test this product and we publish no reviews. Everything below comes from the ingredient list and pH published on the brand's own product page (accessed October 2026), and from dermatology sources listed at the end. Formulas change; always check the box you actually have.
What the label says
US cosmetics list ingredients in descending order of predominance, down to the ingredients present at 1% or less, which may then appear in any order (see our guide to reading an INCI list). This is the order published by the brand:
- Aqua
- Glycerin
- Propanediol
- Hydrolyzed Hyaluronic Acid
- Sodium Hyaluronate
- Apricot Kernel Oil Polyglyceryl-6 Esters
- Polyglyceryl-6 Oleate
- Caprylyl Glycol
- Polyglyceryl-10 Oleate
- Acrylates/C10-30 Alkyl Acrylate Crosspolymer
- Magnolol
- Kaempferol
- Tetrahexyldecyl Ascorbate
- Glycolipids
- Glycine Soja (Soybean) Sterols
- Tocopheryl Acetate
- Phenoxyethanol
- Sorbitan Palmate
- Potassium Sorbate
- Sodium Hydroxide
- Glyceryl Polyacrylate
- Xanthan Gum
- Hexylene Glycol
Highlighted: the hyaluronic acid forms. The brand notes that an earlier version contained a very small amount of honey, since removed.
Reading it in groups
- The hydrating base: water, glycerin, propanediol. Glycerin is one of the best-studied humectants in skincare and does much of the work in almost any "hydrating" serum. Propanediol is a solvent and humectant that also helps preservatives work.
- The hyaluronic acid: hydrolyzed hyaluronic acid and sodium hyaluronate. Sodium hyaluronate is the salt form of hyaluronic acid used in most products. "Hydrolyzed" means the long chains have been broken into shorter fragments, which is how formulators reach the "low" and "very low" molecular weights.
- Texture and emulsifiers. The polyglyceryl esters and oleates are mild emulsifiers that let small amounts of oil-soluble ingredients sit in a water base. The acrylates crosspolymer, glyceryl polyacrylate and xanthan gum give the gel its slip; sodium hydroxide adjusts the pH.
- Minor antioxidants. Magnolol and kaempferol (plant-derived compounds), tetrahexyldecyl ascorbate (an oil-soluble vitamin C derivative) and tocopheryl acetate (a vitamin E ester) appear after the texture agents, which suggests small amounts. Treat them as supporting ingredients, not as a vitamin C treatment.
- Preservation. Phenoxyethanol, potassium sorbate, caprylyl glycol and hexylene glycol keep a water-based product from growing microbes once opened. A water-based serum without a preservative system is a risk, not a selling point.
Notably absent: added fragrance and essential oils. That makes the formula a reasonable candidate for sensitive skin, though no product suits everyone, and a patch test is still worth the week.
What "four molecular weights" means
Hyaluronic acid is a long sugar chain (a polysaccharide) that the body makes itself; skin contains a large share of the body's supply. Its size is measured in kilodaltons (kDa). Large chains, of the order of a thousand kDa or more, stay on the surface and form a film that holds water and feels smooth. Smaller, fragmented chains can sit deeper in the upper layers of the stratum corneum.
The idea behind "multi-weight" serums comes from studies such as Pavicic and colleagues (2011, Journal of Drugs in Dermatology), who gave 76 women 0.1% hyaluronic acid creams of different sizes (50, 130, 300, 800 and 2,000 kDa) to apply twice daily around one eye for 60 days, with a plain cream around the other eye. All of the sizes improved skin hydration and elasticity compared with the placebo side; only the lower weights (130 and 50 kDa) significantly reduced wrinkle depth. It was a small study with a commercial background, and 0.1% is far below the "5%" on this box, which is a different kind of number (see below). But it is the main evidence that mixing sizes is a reasonable design choice, not just marketing.
The 5% in the product name is how the brand describes its hyaluronic acid content. Hyaluronic acid itself thickens water heavily even at fractions of a percent, so figures like this usually refer to a hyaluronic acid solution or complex rather than to pure powder. The number tells you more about the brand's naming than about strength; it is not comparable to the percentage on an acid or a retinoid.
Does hyaluronic acid "pull water out of your skin" in dry air?
This claim circulates widely. The honest answer is that a humectant pulls water towards wherever water is available. On damp skin in a humid room, that is mostly the surrounding water. In very dry air with nothing sealed on top, some of the water it holds will evaporate, and skin can feel tight. The fix is simple and is what the American Academy of Dermatology recommends for dry skin in general: apply hydrating products to damp skin, and follow with a moisturizer that contains occlusive or emollient ingredients (a cream or an ointment rather than a thin lotion) to slow evaporation.
How to use it
- Cleanse gently and leave the face slightly damp. Pat, don't rub dry.
- Apply a few drops of serum to the face and neck. More is not better; two or three drops cover a face.
- Seal with moisturizer within a minute or two. A gel-cream in humid weather, a richer cream in dry or air-conditioned air.
- In the morning, finish with sunscreen. Hyaluronic acid does not increase sun sensitivity, but daytime skincare without sunscreen leaves the main job undone. See how much sunscreen to use.
Layering in a hot, humid climate
In a city where humidity sits high most of the year, many people find a humectant serum plus sunscreen is enough moisture during the day, and a heavy cream feels sticky. That is a reasonable trade-off. The exceptions are offices and bedrooms with strong air-conditioning, where indoor air can be much drier than outdoors: a light moisturizer on top of the serum in the evening usually helps. Our guide to skincare in a hot, humid climate goes through a full routine, and moving to a new climate explains how to adjust when you relocate.
With other actives
Hyaluronic acid is one of the least reactive ingredients in a routine, so it combines with almost everything. It is often used to make stronger steps more comfortable: after an evening retinoid, or on the nights you are not using an exfoliating acid such as the lactic acid serum we decode elsewhere. If you use several serums, apply the thinnest first. Our guide to combining active ingredients has a simple pairing table, and niacinamide is another low-risk partner.
| Skin or situation | Useful? | What to pair it with |
|---|---|---|
| Oily, humid climate | Yes, light hydration without oil | Gel moisturizer or none; sunscreen in the morning |
| Dry or air-conditioned air | Yes, on damp skin only | A cream with ceramides, shea or petrolatum on top |
| Sensitive skin | Usually well tolerated; fragrance-free here | Patch test first; keep the rest of the routine short |
| Using retinoids or acids | Yes, as a buffer | Apply after the active, or on rest nights |
Buying it abroad
If you buy a US serum through a reseller or a marketplace, check the batch code and expiry on the box, that the ingredient list matches the brand's published one, and, in Malaysia, that the product appears in the NPRA's cosmetic notification search. Our guides to buying US beauty products from abroad and storing skincare in heat cover the details.
Sources
- Ingredient list and formula pH as published on the brand's product page for Quadruple Hyaluronic Acid Serum 5% (accessed October 2026).
- Pavicic T. et al., "Efficacy of cream-based novel formulations of hyaluronic acid of different molecular weights in anti-wrinkle treatment", J Drugs Dermatol 2011;10(9):990–1000.
- American Academy of Dermatology, Dermatologists' top tips for relieving dry skin.
- US FDA, Cosmetics Labeling Guide (ingredient order, 21 CFR 701.3).
Routines by skin typeSkincare in a hot, humid climate
Light textures, sweat-proof sunscreen habits, heat rash and the dry office air nobody expects in the tropics.
Routines by skin typeA routine for dry skin
Humectants, emollients and occlusives in plain words, and the dermatologists' habits that do most of the work.
IngredientsCombining active ingredients
Retinoids, acids, vitamin C, niacinamide and benzoyl peroxide: a pairing table and a simple weekly plan.