At just 13 ingredients for 0, this is one of the most stripped-back HA serums on the market — yet it includes both multi-weight hyaluronic acid and Matrixyl 3000 peptides. Most budget HA serums skip the peptide complex. The triple molecular weight approach (high, medium, low) provides layered hydration that cheaper single-weight HA products cannot match. The 60ml and 100ml size options are also unusual and improve the value proposition significantly.
A near-perfect entry point into hyaluronic acid skincare — multi-weight HA and Matrixyl 3000 peptides in a 13-ingredient formula for ten dollars. It does not try to be everything, but what it does — hydrate, plump, and prep — it does with remarkable efficiency and zero irritation risk.
The case for it
Same rule for everyone. “Good choice” is the verdict on 9,564 of 45,024 concern verdicts across the catalog; rule R5 decided 9,072 of them. Unchanged since September 5, 2026, engine 5.1.1.
Brand or formulator? Disclose a concentration or correct a fact →
The studies behind the evidence row
The case for it
Same rule for everyone. “Good choice” is the verdict on 9,564 of 45,024 concern verdicts across the catalog; rule R5 decided 9,072 of them. Unchanged since September 5, 2026, engine 5.1.1.
Brand or formulator? Disclose a concentration or correct a fact →
The studies behind the evidence row
The case for it
What would change this: Guideline or regulatory standing for the active on this concern would move this from a promising bet to a recommendation.
Same rule for everyone. “Promising” is the verdict on 7,858 of 45,024 concern verdicts across the catalog; rule R9p decided 7,858 of them. Unchanged since September 5, 2026, engine 5.1.1.
Brand or formulator? Disclose a concentration or correct a fact →
The studies behind the evidence row
The case for it
What would change this: A researched evidence row for the lead active would replace this with a verdict.
Same rule for everyone. “Supporting role” is the verdict on 8,197 of 45,024 concern verdicts across the catalog; rule R8 decided 4,250 of them. Unchanged since September 5, 2026, engine 5.1.1.
Brand or formulator? Disclose a concentration or correct a fact →
Also listed for Aging — the actives here (Glycerin, Hyaluronic Acid, Matrixyl Peptides) are in our research queue for that concern; there is no verdict until their evidence rows are written. That is a gap in our table, not a mark against the product.
A verdict is DermApproved’s assessment of how well a product’s ingredients fit a concern — never a claim about what the product treats. Evidence dots and collected reviews sit beside it and are never blended in. Rules 0.5.1 · evidence table ev-2026.09-r228 · how we decide
The hyaluronic acid serum market is one of the most crowded in skincare. Every brand from every price tier has one, and the marketing claims blur together into a haze of hydration promises and dew-drop imagery. When The INKEY List launched in 2018, they entered this saturated market with a serum that cost ten dollars and contained thirteen ingredients. It should have been unremarkable. Instead, it became one of the most awarded budget serums on the market.
The formula's intelligence is in what it includes and what it leaves out. The hyaluronic acid system uses multiple molecular weights — high, medium, and low — each serving a distinct function. High-molecular-weight sodium hyaluronate sits on the skin's surface, forming a moisture-binding film that provides immediate plumpness and a dewy feel. Medium-weight fractions hydrate the mid-epidermis. Low-molecular-weight hyaluronic acid penetrates deeper, as confirmed by a 2015 study in Skin Research and Technology that tracked HA penetration using Raman spectroscopy. This layered approach means the serum works at multiple depths simultaneously rather than just sitting on top of the skin looking pretty. It is also the answer to the persistent belief that every HA serum is fundamentally the same product in a different bottle — molecular weight determines where the molecule can go, and a single-weight formula only ever works in one place.
The inclusion of Matrixyl 3000 at a ten-dollar price point is genuinely surprising. This trademarked peptide complex — palmitoyl tripeptide-1 and palmitoyl tetrapeptide-7 — has published data showing it stimulates collagen synthesis and reduces inflammatory markers associated with aging. In a study published in Cosmetics, the complex decreased skin roughness by fourteen percent and reduced deep wrinkle area by forty-four percent over fifty-six days. At the trace concentration likely present here, the effects will be modest, but the fact that it is included at all sets this formula apart from the dozens of budget HA serums that contain nothing but hyaluronic acid and water.
The texture is one of the serum's greatest practical strengths. It is genuinely watery — not thick, not gel-like, not sticky. It absorbs into damp skin within seconds and leaves behind nothing but a barely-there dewiness. Under moisturizer, under sunscreen, under makeup, it layers without a trace of pilling or interference. For a product that sits at the base layer of a multi-step routine, this frictionless compatibility matters enormously.
Glycerin and propanediol in the second and fourth positions provide additional humectant support. In practice, this means the hydrating effect does not rely on hyaluronic acid alone — the glycerin draws moisture independently, and the propanediol enhances ingredient delivery while adding its own light hydrating contribution. The radish root ferment filtrate serves as a natural preservative boost, contributing to a preservation system so lean that phenoxyethanol is the only conventional preservative on the list. The remaining entries are structural: butylene glycol as a solvent, carbomer and an acryloyldimethyltaurate copolymer to give the water a whisper of body so it doesn't run off the fingertips, and polysorbate 20 to keep everything in solution. That last one carries the formula's one real asterisk — polysorbate 20 is why this isn't fungal-acne-safe, which is worth knowing if you're treating malassezia rather than dryness.
The critical usage note that many people miss: this serum must be applied to damp skin. Hyaluronic acid draws moisture from its environment. On damp skin, it pulls that surface water into the epidermis. On dry skin in a dry room, it can theoretically draw water from deeper skin layers instead, leaving the surface feeling tighter rather than more hydrated. A spritz of toner or a splash of water before application makes the difference between loving this product and finding it counterproductive. Two or three drops is the whole dose, patted rather than rubbed, and the pointed-nozzle tube will happily give you five if you squeeze without thinking — the packaging's only real fault.
The limitations are proportionate to the price. At ten dollars for thirty milliliters, the bottle is small and will last two to three months with twice-daily use. The sixty and hundred milliliter sizes address this with meaningfully better per-unit value, and anyone who has already decided they like the serum should skip straight to them. The formula is also intentionally simple — there are no antioxidants, no ceramides, no niacinamide. It hydrates and it plumps. For anything else, you layer other products on top.
For very dry skin, this serum alone will not be enough. It pulls moisture in and holds it, but without an occlusive layer on top — a cream, an oil, a sleeping mask — that moisture can gradually escape, especially in dry climates or heated indoor environments. It's not a flaw; it is the nature of humectant-based hydration. The serum was designed to be the first layer, not the only layer. That positioning is also what makes it such a useful buffer under a retinoid: hydrated skin tolerates actives better, and this adds no acids, no fragrance, and nothing that could conflict with whatever comes next. Pregnancy-safe, sensitivity-safe, and compatible with essentially everything, it is the rare product with almost no one to warn away.
What you should expect is honest and immediate: plumper, smoother skin within minutes, a better hydration baseline within a couple of weeks, and — if the peptides are doing anything at their dose — a gradual softening of fine lines over a month or two. Across roughly six thousand reviews the sentiment is consistent, and the recurring complaints are the same two the formula openly invites: it runs out fast, and it needs a moisturizer over it.
Some users comparing this to premium HA serums charging forty to sixty dollars will note that the effects are subtler. Those formulas often contain higher HA concentrations, additional actives, or more sophisticated encapsulation technology. But for the fundamental job of pulling moisture into the skin and supporting it with peptide activity, this ten-dollar serum delivers the essential experience. The Allure Best of Beauty Award was not a participation trophy — it was recognition that The INKEY List had stripped the HA serum concept down to its most effective, most accessible form.
The hero actives that drive this product's performance.
| Ingredient | Function | Evidence |
|---|---|---|
| Multi-Molecular Hyaluronic Acid (2%) (2%) | The star ingredient system using three molecular weights of HA. High-molecular-weight sodium hyaluronate forms a moisture-binding film on the surface. Medium-weight fractions hydrate the mid-epidermis. Low-molecular-weight hyaluronic acid penetrates deeper to plump from within. This layered approach provides both immediate surface hydration and sustained deeper moisture. | Established mechanism for Dehydration · established mechanism |
| Matrixyl 3000 (Palmitoyl Tripeptide-1 + Palmitoyl Tetrapeptide-7) | A signal peptide complex that adds anti-aging benefits beyond hydration. Palmitoyl tripeptide-1 stimulates collagen synthesis by mimicking a growth factor signal. Palmitoyl tetrapeptide-7 reduces the IL-6 inflammatory response that accelerates aging. Together, they address fine lines from the cellular level while the HA addresses them from the hydration level. | Not yet assessed |
| Glycerin | Listed third in the INCI as a supporting humectant. Works alongside the HA to draw water into the skin from the environment and deeper skin layers, providing a broader moisture-attracting network than HA alone could achieve. | Established mechanism for Dryness · established mechanism |
Ingredient standings describe the active at treatment-level doses and vehicles; this product's own condition grades weigh its actual formula.
Water (Aqua/Eau), Propanediol, Glycerin, Butylene Glycol, Sodium Hyaluronate, Ammonium Acryloyldimethyltaurate/VP Copolymer, Leuconostoc/Radish Root Ferment Filtrate, Hyaluronic Acid, Carbomer, Polysorbate 20, Palmitoyl Tetrapeptide-7, Palmitoyl Tripeptide-1, Phenoxyethanol
serum
AM & PM
Apply 2-3 drops to damp skin — this is critical for HA efficacy. Pat gently into the face and neck. Layer under moisturizer to seal in the hydration. Can be used both morning and evening. In the AM, follow with moisturizer and sunscreen. Layers well under all product types without pilling.
Immediate: skin feels plumped, smooth, and hydrated within minutes. 1-2 weeks: improved baseline hydration and reduced flakiness. 4-8 weeks: cumulative improvements in skin plumpness and fine line appearance from sustained hydration and Matrixyl peptide activity.
The multi-weight hyaluronic acid approach in this serum is supported by robust penetration research. A 2015 study in Skin Research and Technology used Raman spectroscopy to track HA of different molecular weights and confirmed that HA below 100 kDa penetrates into the skin, with lower molecular weight fractions reaching deeper layers. A 2011 study in the Journal of Cosmetic Dermatology found that low-molecular-weight HA was associated with significant reduction in wrinkle depth compared to high-molecular-weight HA alone — validating the benefit of the multi-weight approach used here.
A 2024 clinical evaluation published in the Journal of Clinical and Aesthetic Dermatology tested a multi-weight HA formulation applied twice daily for four weeks in 31 female subjects and found significant improvements across all rejuvenation parameters. A comprehensive 2023 review confirmed that combining multiple HA molecular weights delivers both surface film-forming hydration and deeper penetrating benefits — precisely the strategy this formula employs.
The Matrixyl 3000 peptide complex (palmitoyl tripeptide-1 + palmitoyl tetrapeptide-7) has its own evidence base. Published data shows the complex decreased skin roughness by 14%, reduced deep wrinkle area by 44%, and improved skin tone by 15% after 56 days of application. While the concentration in this serum is not disclosed and likely modest, even trace peptide activity adds value to what would otherwise be a pure hydration play.
Dermatologists consistently recommend hyaluronic acid as a foundational hydrating ingredient suitable for all skin types. The multi-molecular-weight approach in this serum aligns with current dermatological understanding that different HA sizes serve different functions — surface hydration from large molecules and deeper plumping from smaller ones. Dermatologists note that the critical factor for HA efficacy is application technique: applying to damp skin and sealing with a moisturizer. The addition of Matrixyl 3000 peptides is recognized as a bonus for anti-aging, though dermatologists emphasize that peptide concentrations in OTC products are typically modest. For patients on a budget, dermatologists frequently recommend this type of affordable, well-formulated HA serum as a hydration staple.
After cleansing, leave skin slightly damp — splash with water or apply toner first. Squeeze 2-3 drops onto fingertips and press gently into the face and neck. Do not rub. Follow immediately with a moisturizer to seal in the hydration. Use twice daily, morning and evening. In the AM, layer under moisturizer and sunscreen. In the PM, apply before treatments and night cream. Can be mixed with other serums if desired.
At $10 for 30 ml ($0.33/ml), this is among the most affordable multi-weight HA serums available — and the inclusion of Matrixyl 3000 peptides makes the value proposition even stronger. The 60ml size at 8 ($0.30/ml) and 100ml at 5 ($0.25/ml) improve the economics further. By comparison, The Ordinary Hyaluronic Acid 2% + B5 costs roughly $0.27/ml but lacks the peptide complex. Premium HA serums run as high as $3/ml. The Allure Best of Beauty Award confirms this product competes effectively against options at five to ten times the price.
This is ideal for anyone seeking affordable, effective hydration — particularly those new to serums, building a skincare routine on a budget, or looking for a reliable layering base. It is especially well-suited for dry, dehydrated, and sensitive skin types, and its pregnancy-safe formula makes it a staple for expecting parents.
Give it a miss if you have very dry skin and want a single product to solve dehydration — you will need a moisturizer on top. Those with fungal acne should avoid the polysorbate 20. If you are looking for a serum with multiple active benefits beyond hydration, a more complex formula may serve you better.
Ready to try The INKEY List Hyaluronic Acid Serum?
Buy at Amazon ♥Lightweight, watery serum with a barely-there gel quality. Absorbs almost instantly into damp skin without stickiness, tackiness, or residue. One of the lightest textures in the HA serum category.
Fragrance-free. No detectable scent whatsoever.
White plastic squeeze tube with pointed nozzle applicator in The INKEY List's minimalist black-and-white design. Available in 30ml, 60ml, and 100ml sizes. The squeeze tube allows controlled dispensing, though the pointed nozzle can occasionally over-dispense.
On first application to damp skin, the serum melts in within seconds. Skin feels immediately plumper and smoother — the high-molecular-weight HA creates a perceptible hydrating film. No stinging, tingling, or irritation. The effect is subtle but real: skin looks more hydrated and dewy within minutes.
2-3 months with twice-a-day use of 2-3 drops. The 60ml and 100ml sizes offer 4-8 months respectively.
All Year
This was one of the original products that launched with The INKEY List brand in 2018. The founders built the brand on the premise that effective skincare ingredients should not cost a premium, and the HA serum became the poster child for that philosophy. Winning the Allure Best of Beauty Award in 2022 validated the formula against competitors costing five to ten times as much. It remains one of the brand's bestsellers and a frequent entry point for new customers.
The INKEY List launched in 2018 with this Hyaluronic Acid Serum as part of its founding lineup. The brand is B Corp and Leaping Bunny certified, with Sephora Clean designation. It has won an Allure Best of Beauty Award for this product and built strong credibility through ingredient transparency and accessible pricing.
All hyaluronic acid serums are basically the same
The molecular weight of HA dramatically affects where it works in the skin. A 2015 study in Skin Research and Technology confirmed that HA below 100 kDa penetrates into the skin while larger molecules remain on the surface. This serum uses three molecular weights to address different skin layers simultaneously — a meaningfully different approach from single-weight formulas.
Hyaluronic acid pulls moisture out of your skin in dry climates
In very low humidity environments, HA can theoretically draw water from deeper skin layers if no external moisture is available. The solution is simple: apply to damp skin and seal with a moisturizer. The glycerin and propanediol in this formula also help maintain hydration regardless of ambient humidity.
Apply 2-3 drops to damp skin — this is essential. HA draws moisture from the nearest source, so applying to wet skin gives it water to pull into the epidermis. Follow immediately with a moisturizer to seal in the hydration. Skipping the damp skin step can actually make your skin feel tighter.
Matrixyl 3000 is a peptide complex of palmitoyl tripeptide-1 and palmitoyl tetrapeptide-7. It stimulates collagen production and reduces inflammatory aging markers. Including it in an HA serum means you get hydration and anti-aging in one step — unusual for a 0 product.
For basic hydration and plumping, the 2% multi-weight HA in this serum delivers comparable results to products costing 0-50. The Matrixyl 3000 is a bonus. Where premium serums may have an edge is in additional actives, more sophisticated delivery systems, or higher HA concentrations. But for the fundamentals, this is extremely competitive.
Yes — hyaluronic acid pairs beautifully with retinol. Apply the HA serum first to damp skin, let it absorb, then apply your retinol product. The hydration from HA helps buffer the drying effects of retinol, reducing the irritation and flaking that often accompanies retinoid use.
The 30ml (0) is ideal for trying the product. If you know you love it, the 60ml (8) or 100ml (5) sizes offer significantly better per-ml value. The 100ml is roughly $0.25/ml compared to $0.33/ml for the standard size — and it will last 6-8 months of twice-daily use.
Yes — The INKEY List includes this in their pregnancy-safe product guide. The formula contains no retinoids, salicylic acid, or other pregnancy-flagged ingredients. Hyaluronic acid and peptides are both considered safe for use during pregnancy and breastfeeding.
Recurring themes our editors read across retailer reviews of this product — summaries in our words, not quotations, and not a substitute for your own patch test.
Lightweight watery texture absorbs instantly without any stickiness
Incredible value at $10 for a multi-weight HA serum with peptides
Immediately plumps and hydrates — visible difference from first use
Layers perfectly under every product type without pilling
Clean 13-ingredient formula with no fragrance, silicone, or filler
Suitable for all skin types including the most sensitive
Not hydrating enough for very dry skin as a standalone — needs moisturizer on top
Small 30ml size runs out quickly with twice-daily use
Must be applied to damp skin or can feel tight and counterproductive
Results are subtle compared to more concentrated premium HA serums
Squeeze tube packaging can over-dispense product easily
Not fungal-acne-safe due to polysorbate 20
