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Good choice for Dehydration
What Makes This Different
This was one of the first mass-market serums to combine multiple molecular weights of hyaluronic acid in a single formula at a sub-$10 price point. The inclusion of a cross-linked HA polymer alongside standard sodium hyaluronate creates a sustained-release hydration effect that most budget HA serums don't attempt. While the reformulated version has since surpassed it, this original formula remains a proof-of-concept for effective hydration without luxury pricing.
The Ordinary
The Ordinary Hyaluronic Acid 2% + B5 Review
Hydration on a Shoestring
serum serum clinical Paraben Free Fungal Acne Safe Cruelty Free Vegan
The serum that launched a thousand dupes — a simple, effective multi-weight hyaluronic acid formula that delivers genuine hydration at a price that made the entire skincare industry rethink its margins. The sticky texture is real, but so are the results.
Made in Canada Launched 2016 All-year use PAO: 12 months
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Verdicts All dehydration products →All dryness products →All dullness products →
How well it fits each concern
Verdict by concern tap a concern for the case
Good choicefor DehydrationIn your profileYou chose · Hyaluronic Acid is a reference standard by mechanism for dehydration; this serum carries it at 2%.
The case for it
- Sodium Hyaluronate has trial-supported standing for this concern.
- It is present at an effective concentration, declared or high in the ingredient list.
- The formula carries none of the triggers this concern is sensitive to.
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 →
Show the work
- Rule
- R5 — Trial-supported or guideline-supported active, adequately or plausibly dosed. · the full register
- Carrying active
- Sodium Hyaluronate
- Standing
- supported — its mechanism is established
- Form
- adequate (declared 2%) — studied range 0.1%, from the trials on the row; needs leave-on contact; judge it after ~1 weeks
- Tolerability
- gentle
- Row checked
- against its sources on July 17, 2026 (evidence table ev-2026.09-r228)
The studies behind the evidence row
- Draelos ZD, Cosmetic Dermatology: Products and Procedures — hyaluronic acid classified as a humectant water-binding agent holding many times its weight in water — reference work
Supporting rolefor DrynessIn your profileYou chose · Nothing here targets dryness directly; humectant hydration is the recognised companion to treating it, and this serum does that without known triggers.
The case for it
- Sodium Hyaluronate has no evidence row yet for this concern — it is in the research queue.
- The formula carries none of the triggers this concern is sensitive to.
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 →
Show the work
- Rule
- R8 — The category's job (barrier care, humectant hydration, gentle cleansing, photoprotection) is the documented supportive role for this concern. This is the honest verdict for a moisturizer on an acne page. · the full register
- Carrying active
- Sodium Hyaluronate
- Standing
- not assessed
- Form
- plausible (declared 2%)
- Tolerability
- gentle
Promisingfor DullnessIn your profileYou chose · Hyaluronic Acid has trial-level evidence for dullness but no guideline or regulatory standing yet — promising, short of a recommendation; the other actives here are not yet assessed for it.
The case for it
- Sodium Hyaluronate has trial-level evidence for this concern but no guideline or regulatory standing yet.
- It is present at an effective concentration, declared or high in the ingredient list.
- The formula carries none of the triggers this concern is sensitive to.
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 →
Show the work
- Rule
- R9p — 0.5.0: 'Unproven' beside three filled dots read as one question answered twice with opposite words (7,018 rows). The chip measures standing, the dots measure trial volume; where the row carries at least one RCT or a tier-2 source (moderate dots) and the active is present at a working level, the honest word is Promising. Unproven is reserved for plausible-standing rows with limited or weak evidence, or an under-dosed form. Same rank as Unproven — a bet either way; the dots order them. · the full register
- Carrying active
- Sodium Hyaluronate
- Standing
- plausible — trials support it
- Form
- adequate (declared 2%)
- Tolerability
- gentle
- Row checked
- against its sources on July 17, 2026 (evidence table ev-2026.09-r228)
The studies behind the evidence row
- Benefits of topical hyaluronic acid for skin quality and signs of skin aging: From literature review to clinical evidence — Dermatologic Therapy (2022), opened July 16, 2026
Also listed for Aging — the actives here (Hyaluronic Acid, Panthenol (Vitamin B5) 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.
Where our review and the verdict differ. The review below was written on the formulation and the published trials; the verdicts above apply the stricter standing test in our methodology — an active earns a recommendation only with guideline or regulatory standing for the concern. Where the two disagree, the verdict is DermApproved’s position.
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
Assessment
Pros & Cons
Pros
- ✓ Exceptional value at $8.90 for a multi-weight hyaluronic acid serum with panthenol
- ✓ Four forms of HA targeting different skin depths for comprehensive hydration
- ✓ Universally tolerable formula with zero common irritants or allergens
- ✓ Pairs seamlessly with virtually every other skincare active in any routine
- ✓ Immediate visible plumping effect that improves with consistent use over weeks
- ✓ Fragrance-free, oil-free, silicone-free, vegan, and cruelty-free
Cons
- ✗ Noticeably sticky, tacky texture that some users find cosmetically unpleasant
- ✗ Small 30ml bottle depletes quickly with twice-daily use on face and neck
- ✗ Reformulated ceramide version offers objectively better texture and added benefits
- ✗ Must be applied to damp skin for optimal results — dry application can feel tight
- ✗ Purely hydrating with no additional active benefits beyond moisture delivery
Review
Full Review
Before The Ordinary launched in 2016, the idea that a multi-weight hyaluronic acid serum could cost less than ten dollars was, to put it diplomatically, not something the skincare industry was interested in exploring. Hydrating serums sat comfortably in the $40-80 range, and the brands making them had no particular incentive to ask whether that pricing reflected the actual cost of putting sodium hyaluronate in a bottle. Then DECIEM dropped this product at $6.80, and the conversation changed permanently.
The Hyaluronic Acid 2% + B5 wasn't just cheap — it was transparently cheap. The name told you exactly what was inside: hyaluronic acid at 2%, pro-vitamin B5, done. No proprietary complexes with invented names, no suggestion that this particular hyaluronic acid was harvested during a specific lunar phase. Just a well-formulated hydrating serum that did what it said, at a price that made the markups on similar products suddenly very visible.
The formula works through what The Ordinary describes as a multi-depth hydration approach. Three molecular weights of sodium hyaluronate — high, medium, and low — each target a different level of the skin. High-molecular-weight HA sits on the surface, forming a moisture-retaining film that provides immediate plumping and a dewy finish. Medium-weight molecules penetrate into the upper epidermis, providing hydration where it supports the skin's structural integrity. Low-molecular-weight HA reaches deeper, delivering moisture to layers that surface-level hydrators can't touch. On top of this, a sodium hyaluronate crosspolymer — a cross-linked version of HA with enhanced water-binding capacity — provides sustained hydration that outlasts the standard forms.
Panthenol, the pro-vitamin B5 component, serves a purpose that's easy to overlook but genuinely important in this context. Hyaluronic acid is excellent at attracting and holding water, but it does nothing for the skin barrier that keeps that water from evaporating. Panthenol addresses this gap by supporting barrier function and reducing transepidermal water loss. In a formula designed around hydration, having an ingredient that protects the hydration you've just delivered is quietly essential.
The texture is where this product earns its only real criticism, and it's a fair one. The original formulation has a noticeable stickiness — a tacky, slightly gummy feel that lingers for a minute or two after application. It's not unbearable, and it diminishes significantly when you apply the serum to damp skin (which you should be doing anyway for optimal HA performance), but it's the kind of tactile experience that makes some users reluctant to reach for it twice a day. The Ordinary clearly heard this feedback, because the reformulated ceramide version addresses the texture directly. But the original formula's stickiness is a cosmetic inconvenience, not a performance issue — the hydration it delivers is uncompromised.
Results follow a predictable but satisfying arc. First application delivers an immediate plumping effect — skin looks dewy, feels softer, and fine dehydration lines temporarily fill in. This is the hyaluronic acid doing its most visible work, pulling water to the skin's surface. Over one to two weeks of consistent use, the hydration becomes more sustained. Skin retains moisture better throughout the day, the tight-dry feeling that dehydrated skin knows intimately starts to fade, and makeup sits more smoothly over a properly hydrated base. The longer-term benefits — improved skin texture, a more resilient moisture barrier, and a baseline level of hydration that makes other products in your routine work better — emerge over four to six weeks.
The ingredient list is refreshingly short, which is both a strength and a limitation. Sixteen ingredients means there's very little in this bottle that could irritate reactive skin — no fragrance, no essential oils, no acids, no retinoids. It's the serum equivalent of a blank canvas, designed to hydrate without interfering with anything else in your routine. But it also means this is purely a hydrating serum. It won't brighten, it won't exfoliate, it won't address hyperpigmentation. It does one thing, and the question is whether it does that one thing well enough to justify its spot in your routine.
The answer, for most people, is yes. Hyaluronic acid is one of the most universally tolerated and researched ingredients in skincare, and the multi-weight approach in this formula delivers measurably better hydration than a single-weight HA serum. At $8.90 for a bottle that lasts two to three months, the value proposition remains exceptional even as the price has crept up from its original launch point.
There is an honest conversation to be had about whether you should buy this or the reformulated version with ceramides. If you're new to the product, the reformulation is likely the better choice — it addresses the texture issue, adds barrier-supporting ceramides, and includes a fifth molecular weight of HA. But if you've been using the original happily and see no reason to change, there's nothing wrong with sticking with what works. The original Hyaluronic Acid 2% + B5 isn't outdated — it's just been joined by an improved sibling.
What this serum represents matters as much as what it contains. It proved that effective skincare doesn't require luxury pricing, that transparency in ingredient lists builds more trust than proprietary blend names, and that consumers are smart enough to evaluate a formula on its merits rather than its marketing. Nearly a decade later, the entire industry looks different because this product existed. The sticky texture is a small price to pay for a serum that changed the rules.
Formula
Key Ingredients
The hero actives that drive this product's performance.
| Ingredient | Function | Evidence |
|---|---|---|
| Sodium Hyaluronate (Multi-Weight) (2%) | Delivered in three molecular weights — low, medium, and high — each targeting a different depth of the skin. High-molecular-weight HA forms a moisture-retaining film on the surface, medium-weight penetrates to the upper epidermis, and low-weight reaches deeper layers, creating a layered hydration system that works with the crosspolymer to address dehydration comprehensively. | Established mechanism for Dehydration · established mechanism |
| Sodium Hyaluronate Crosspolymer | A next-generation hyaluronic acid variant with a cross-linked molecular structure that claims five times the water-binding capacity of standard sodium hyaluronate. In this formula, it provides sustained-release hydration that outlasts the immediate plumping effect of the standard HA forms, extending the serum's moisturizing benefits throughout the day. | Established mechanism for Dehydration · established mechanism |
| Panthenol (Pro-Vitamin B5) | Works synergistically with the hyaluronic acid complex in this formula by strengthening the skin's moisture barrier from within. While the HA draws and holds water, panthenol supports the structural integrity of the barrier that keeps that moisture locked in — addressing both the supply and retention sides of hydration. | Established mechanism for Dehydration · established mechanism |
| Ahnfeltia Concinna Extract | A marine algae extract that provides a natural polysaccharide matrix in this formula, complementing the hyaluronic acid's humectant properties with additional water-binding capacity and a film-forming effect that helps smooth the skin's surface texture. | Not yet assessed |
Ingredient standings describe the active at treatment-level doses and vehicles; this product's own condition grades weigh its actual formula.
Full INCI List
Aqua (Water), Sodium Hyaluronate, Pentylene Glycol, Propanediol, Sodium Hyaluronate Crosspolymer, Panthenol, Ahnfeltia Concinna Extract, Glycerin, Trisodium Ethylenediamine Disuccinate, Citric Acid, Isoceteth-20, Ethoxydiglycol, Ethylhexylglycerin, Hexylene Glycol, 1,2-Hexanediol, Phenoxyethanol, Caprylyl Glycol
✓ Pregnancy Safe ✓ Fragrance Free✓ Alcohol Free✓ Oil Free✓ Silicone Free✓ Paraben Free✓ Sulfate Free✓ Cruelty Free✓ Vegan✓ Fungal Acne Safe
Compatibility
Skin Match
Works For
Routine Step
serum
Time of Day
AM & PM
Layering Tips
Apply to damp skin immediately after cleansing and toning for optimal hyaluronic acid performance. Layer under moisturizer to seal in hydration. Can be mixed with other water-based serums. Apply before oils and creams.
Results Timeline
Immediate plumping and surface hydration visible after first application. Within 1-2 weeks, reduced appearance of fine dehydration lines and improved skin texture. Cumulative hydration benefits and overall skin quality improvement at 4-6 weeks of consistent use.
ceramide moisturizersniacinamidevitamin C serumsretinoidspeptidesSPF
Planning a combo? Check it against what you already use
Sample AM Routine
- Gentle cleanser
- THIS PRODUCT (on damp skin)
- Moisturizer
- Broad-spectrum SPF 30+
Sample PM Routine
- Gentle cleanser
- Treatment serum (if using)
- THIS PRODUCT (on damp skin)
- Moisturizer
Evidence
Science & Expert Perspective
The Science
Hyaluronic acid is one of the most extensively studied humectants in dermatology, with a water-binding capacity of up to 1,000 times its own weight. The multi-molecular-weight approach in this formula is grounded in research showing that HA's skin benefits vary significantly with molecular size.
A study reported in the Journal of Drugs in Dermatology (2014) by Pavicic et al. demonstrated that low-molecular-weight hyaluronic acid (50-130 kDa) penetrates the epidermis more effectively and provides superior deep hydration, while high-molecular-weight HA (1,000-1,400 kDa) forms a protective, moisture-retaining film on the skin surface. The combination of multiple weights — as used in this formula — delivers both immediate surface hydration and sustained deeper moisturization that single-weight HA products cannot match.
The sodium hyaluronate crosspolymer adds another dimension. Cross-linked HA forms a three-dimensional network that resists enzymatic degradation by hyaluronidase, the enzyme that breaks down standard HA in the skin. This structural resistance translates to longer-lasting hydration — the crosspolymer continues binding water hours after the standard HA forms have been metabolized.
Panthenol's role in this formula is supported by a review published in the Journal of Cosmetic Science (Camargo et al., 2011) showing that topical panthenol significantly improves skin moisture content, reduces transepidermal water loss, and accelerates barrier recovery. In a hydration-focused formula, panthenol doesn't just add moisture — it helps the skin retain the moisture that the hyaluronic acid attracts, creating a complementary mechanism that addresses hydration from both the supply and retention sides.
- Efficacy of cream-based novel formulations of hyaluronic acid of different molecular weights in anti-wrinkle treatment. — Journal of Drugs in Dermatology (2011)
Dermatologist Perspective
Dermatologists widely recommend hyaluronic acid serums as a foundational hydration step for virtually all skin types, and this product is frequently cited as an accessible entry point. Practitioners often mention that the multi-weight HA approach reflects current understanding of how different molecular sizes interact with the skin — large molecules hydrate and protect the surface, while smaller molecules penetrate for deeper moisturization. The addition of panthenol is recognized as a thoughtful choice that supports barrier function alongside hydration. Dermatologists commonly suggest this serum as a layering product under tretinoin or other potentially drying treatments, leveraging its barrier-supporting properties to improve retinoid tolerability.
Guidance
Usage & Recommendations
How to Use
Apply 3-4 drops to the face and neck morning and evening, immediately after cleansing while skin is still damp. Gently pat into skin rather than rubbing. Follow immediately with a moisturizer to seal in hydration. Can be layered under any serum, cream, or sunscreen. For best results in dry climates, mist face with water before application and always seal with an occlusive or rich moisturizer. Avoid applying to completely dry skin.
Value Assessment
At $8.90 for 30ml, this serum delivers a multi-weight hyaluronic acid complex with panthenol for less than the cost of a single-serve specialty coffee in most cities. The per-use cost with twice-daily application comes to roughly ten to fifteen cents. While the single size option means there's no larger format for better per-ml value, the price point is already low enough that this barely matters. The Ordinary's vertically integrated manufacturing through DECIEM keeps costs down, and this product exemplifies their model — nearly every dollar reflects the formula rather than marketing overhead. For a hydrating serum, this remains one of the best values in skincare.
Who Should Buy
Anyone looking for a simple, effective hydrating serum at an accessible price point — especially those with dehydrated, dry, or normal skin who want a layering product that plays well with every other active in their routine. Also ideal for sensitive skin types seeking hydration without irritation risk.
Who Should Skip
Those who prioritize elegant textures and dislike any sticky or tacky feel in their skincare. Anyone already using the reformulated version with ceramides has no reason to switch back. If you need anti-aging, brightening, or acne-fighting benefits from your serum, this hydration-only formula won't address those concerns.
Ready to try The Ordinary Hyaluronic Acid 2% + B5?
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Product Details
Texture
Clear, viscous gel-serum with a noticeably sticky, tacky feel that takes a minute to absorb — the most common complaint about the original formulation
Scent
Completely unscented — no detectable fragrance or chemical smell
Packaging
Frosted glass dropper bottle with a white pipette cap — more premium-feeling than most The Ordinary products, though the dropper can be imprecise
dewylightweight
What to Expect on First Use
On first application, expect an immediate dewy, plumped feel with some surface tackiness. The stickiness subsides within 2-3 minutes as the serum absorbs, especially when applied to damp skin and followed by a moisturizer. No adjustment period, purging, or tingling — this is one of the most instantly gratifying serums in terms of immediate texture improvement.
How Long It Lasts
2-3 months with twice-a-day use on face
Best Season
All Year
VeganCruelty-Free
Background
The Story Behind This Product
Launched alongside The Ordinary's debut collection in 2016, this was one of the products that made DECIEM a household name in skincare. It proved that a multi-weight hyaluronic acid serum didn't need to cost $50-80 — sparking a price war in the hydrating serum category that reshaped the entire industry. The formula has since been updated with a ceramide-enhanced version, but the original remains available for those who prefer the proven formulation.
About The Ordinary Established Brand (5–20 years)
The Ordinary launched in 2016 under parent company DECIEM and quickly became one of the most recognized names in affordable, ingredient-focused skincare. While the brand lacks proprietary clinical trials on its specific formulations, it builds products around well-studied actives at transparent concentrations, earning widespread dermatologist acknowledgment.
Brand founded: 2016 · Product launched: 2016
Myth vs. Reality
Common Myths
Myth
Hyaluronic acid pulls moisture out of your skin in dry climates.
Reality
In very low humidity environments, high-molecular-weight HA on the surface could theoretically draw moisture from deeper skin layers. However, this formula's multi-weight approach — combined with the crosspolymer's water-retention capacity — mitigates this risk. Applying to damp skin and sealing with moisturizer effectively prevents any trans-epidermal water loss.
Myth
Higher concentrations of hyaluronic acid are always better.
Reality
Concentrations above 2% can actually create a gummy, pilling texture that interferes with product layering. The 2% in this formula represents the sweet spot where hydration benefits are maximized without compromising cosmetic elegance or product absorption.
FAQ
Frequently Asked Questions
Should I buy the original or reformulated Hyaluronic Acid 2% + B5?
The reformulated version with ceramides offers additional barrier support, a fifth molecular weight of HA, and a less sticky texture. If you're purchasing for the first time, the reformulated version is the better choice. The original remains a solid option for those who already know and love it or prefer the simpler ingredient list.
Can I use The Ordinary Hyaluronic Acid with vitamin C?
Yes — this serum pairs excellently with vitamin C serums. Apply the vitamin C first to clean skin, then layer this HA serum on top while skin is still slightly damp from the vitamin C. The hyaluronic acid won't interfere with vitamin C absorption and adds hydration that helps buffer potential vitamin C irritation.
Why does The Ordinary Hyaluronic Acid feel sticky?
The stickiness comes from the high concentration of hyaluronic acid and the crosspolymer, both of which are naturally viscous humectants. Applying to damp skin (not dry), using less product, and immediately following with a moisturizer significantly reduces the tacky feeling. The reformulated version addresses this with an improved texture.
Do I need to apply this serum to wet skin?
Yes — hyaluronic acid is a humectant that draws water to itself. When applied to damp skin, it pulls that surface moisture in rather than potentially drawing moisture from deeper skin layers. Mist your face with water or apply immediately after cleansing while skin is still wet for best results.
Can I use The Ordinary Hyaluronic Acid with retinol?
Absolutely. This HA serum is one of the best companions for retinol. Apply your retinoid first, wait a few minutes, then layer this serum to provide hydration that helps buffer retinol dryness and irritation. The panthenol in the formula further supports the barrier during retinoid use.
Is The Ordinary Hyaluronic Acid safe during pregnancy?
Yes. Hyaluronic acid and panthenol are both considered safe during pregnancy. This formula contains no retinoids, salicylic acid, or other pregnancy-restricted ingredients. Its gentle, hydrating nature makes it one of the safest serum options for expectant mothers.
How long does a 30ml bottle of The Ordinary HA last?
With twice-daily use on the face (3-4 drops per application), a 30ml bottle typically lasts 2-3 months. If you also apply to the neck or use larger amounts, expect closer to 6-8 weeks. The dropper dispenses more than you need per squeeze, so use sparingly.
Reviews
What Reviewers Tend to Say
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.
Delivers noticeable plumping and hydration at an unbeatable price point
Lightweight formula layers well under any moisturizer or sunscreen
Suitable for virtually every skin type including sensitive and acne-prone
Visible reduction in fine dehydration lines within the first week
Simple ingredient list minimizes risk of reactions or breakouts
Original formula has a noticeably sticky, tacky texture that some find unpleasant
Small 30ml bottle runs out quickly with twice-daily use on face and neck
Must be applied to damp skin for optimal results which adds a step
The reformulated ceramide version makes this original feel outdated
Frequently cited in dermatologist-recommended budget skincare listsNamed a reader favorite in NewBeauty surveys of over 600 participants