Hyaluronic Acid 2% + B5 Hydrating Serum

Reformulating a bestseller is one of the riskiest moves in skincare. The original Hyaluronic Acid 2% + B5 had been one of The Ordinary's top sellers since the brand's 2016 launch — millions of bottles moved, countless routines built around it, a product so embedded in the skincare conversation that it practically defined the budget hydrating serum category. Touch it wrong, and you alienate a loyal base that's been evangelizing your product for nearly a decade. Touch it right, and you prove you're actually listening.

The Ordinary touched it right.

The 2024 reformulation of the Hyaluronic Acid 2% + B5 — now subtitled "Hydrating Serum" and quietly upgraded with ceramides — reads like a response letter to every piece of user feedback the original ever received. Too sticky? Fixed. No barrier support? Added. Only four molecular weights? Here's a fifth. The result is a product that doesn't just iterate on its predecessor — it makes the original feel like a draft.

The most immediately noticeable change is textural. The original's sticky, tacky finish — the one thing that prevented an otherwise excellent formula from feeling truly elegant — is gone. The reformulated serum absorbs cleanly, leaves a lightweight dewy finish, and layers under subsequent products without the gummy resistance that plagued the original. For a product designed to be used twice daily under other serums, moisturizers, and sunscreen, this is not a trivial improvement. It's the difference between a product you use because it works and a product you enjoy using.

Beneath the improved texture sits a meaningfully upgraded formula. The five-weight hyaluronic acid complex now includes hydrolyzed hyaluronic acid — a form with an even smaller molecular size than the low-weight HA in the original. Hydrolyzed HA penetrates more effectively into the deeper epidermis, delivering moisture to layers that even low-molecular-weight sodium hyaluronate struggles to reach. Combined with the original's high, medium, and low-weight HA plus the sustained-release crosspolymer, this creates the most comprehensive multi-depth hydration system The Ordinary has ever put in a bottle.

But the headline addition is the ceramide complex. Phospholipids and sphingolipids — the lipid building blocks of the skin's intercellular matrix — transform this from a pure humectant into a hydrate-and-protect formula. The original's limitation was always that it pulled water into the skin without doing anything to keep it there beyond panthenol's barrier support. The ceramide components address this directly, reinforcing the structural integrity of the moisture barrier so the hydration delivered by the HA complex actually stays put. Vitamin E (tocopherol) joins the formula as well, protecting those oxidation-sensitive lipids from degrading in the bottle.

Panthenol remains, and it deserves acknowledgment for being the one thing The Ordinary didn't change — because it didn't need changing. Pro-vitamin B5's role in reducing transepidermal water loss and soothing irritated skin makes it the perfect complement to both the HA complex and the new ceramide components. It's the connective tissue between the hydrating and barrier-supporting halves of the formula.

In practice, the serum performs exactly as the upgraded ingredient list would predict. Applied to damp skin — still the optimal method for any HA product — it delivers immediate plumping and a visibly dewy finish that settles into comfortable, non-greasy hydration within a minute. The surface stickiness that characterized the original is reduced to the point of being essentially absent. Over one to two weeks of twice-daily use, sustained hydration improvements become apparent: less midday tightness, better moisture retention in air-conditioned environments, and a smoother baseline skin texture that makes every subsequent product in the routine perform better.

The ceramide benefits take longer to manifest — four to six weeks of consistent use for noticeable barrier strengthening. This is expected; lipid barrier repair is a cumulative process, not an overnight transformation. But users who've previously relied on this serum paired with a ceramide moisturizer may find that the reformulation reduces their dependence on that second product, as the serum itself now pulls some of the barrier-repair weight.

There are limitations worth noting honestly. Some users report pilling when this serum is layered under silicone-heavy sunscreens or foundations — a texture incompatibility rather than a formulation flaw, but annoying nonetheless. The dropper still dispenses more product than a single application requires, encouraging waste. And the review count on retailers combines original and reformulated reviews, making it difficult to isolate feedback specific to the new version.

At $9.90 — just a dollar more than the original — the reformulation represents remarkable value. The ceramide addition alone would justify a price increase that DECIEM chose not to take, and the availability of a 60ml size for those committed to long-term use makes the per-unit economics even more favorable. This is a sub-$10 serum that delivers five molecular weights of hyaluronic acid, ceramide barrier support, panthenol, and vitamin E in a genuinely pleasant texture. The value equation doesn't require a calculator.

For existing fans of the original, the transition is easy and entirely positive — everything you liked is preserved, everything you complained about is fixed, and meaningful new benefits have been added. For newcomers, there's no reason to consider the original when this version exists. The Ordinary proved with the 2024 reformulation that listening to your users and acting on what you hear is not only good product development — it's how you turn a bestseller into something better.

Formula

The Science

The reformulated formula's five-weight hyaluronic acid system is grounded in research demonstrating that molecular weight determines both skin penetration depth and biological activity. A study by Pavicic et al. in the Journal of Drugs in Dermatology (2011) established that low-molecular-weight HA (50-130 kDa) penetrates the epidermis more effectively than high-molecular-weight forms, while high-MW HA (>1,000 kDa) provides superior surface film formation and immediate moisture retention. The addition of hydrolyzed HA — enzymatically cleaved into fragments even smaller than standard low-MW HA — extends the penetration depth further, reaching the deeper epidermis where water content critically supports cellular processes.

The ceramide addition reflects dermatological understanding of the stratum corneum's lipid matrix. The skin barrier is composed of approximately 50% ceramides, 25% cholesterol, and 15% free fatty acids in a lamellar structure. Phospholipids and sphingolipids serve as precursors and structural components of this matrix. A study published in the Journal of Investigative Dermatology by Imokawa et al. demonstrated that topical application of sphingolipids measurably improved barrier function in skin with reduced ceramide content — the exact population that benefits most from a hydrating serum with barrier support.

The inclusion of tocopherol (vitamin E) serves a dual function in this reformulated context. As an antioxidant, it protects the phospholipids and sphingolipids from oxidative degradation — lipids are inherently susceptible to peroxidation, and their stability in a water-based serum requires antioxidant protection. Additionally, tocopherol has demonstrated anti-inflammatory properties in skin, supporting the formula's overall soothing profile.

Panthenol's retention in the formula is supported by Camargo et al.'s review in the Journal of Cosmetic Science (2011), which confirmed that topical panthenol significantly reduces transepidermal water loss and accelerates barrier recovery — benefits that now complement rather than stand alone alongside the ceramide components.

References

1. 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 have responded positively to this reformulation, noting that the addition of ceramide components addresses a long-standing gap in the original formula. Board-certified dermatologists emphasize that a hydrating serum should ideally support both water content and barrier integrity — the original delivered on the first but not the second. The five-weight HA approach is recognized as reflecting current best practices in humectant delivery, and the formula's suitability for post-procedure use has been specifically endorsed by dermatologists who recommend it after microneedling and light chemical peels. The improved texture is also clinically relevant — patient compliance with skincare products correlates strongly with cosmetic elegance, and a less sticky formula is simply more likely to be used consistently.

Guidance

After the original Hyaluronic Acid 2% + B5 spent eight years as one of the bestselling serums in skincare history, The Ordinary reformulated it in 2024 — a risky move given the original's cult status. The reformulation was driven by two clear pieces of feedback: the texture was too sticky, and a hydrating serum should also support the skin barrier. By adding ceramides and a fifth molecular weight of HA while improving the texture, DECIEM managed to upgrade without alienating the original's devoted user base.

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: 2024

Myth vs. Reality

Myth

The ceramides in this formula replace the need for a ceramide moisturizer.

Reality

The phospholipids and sphingolipids here provide supplemental barrier support, but at the concentrations present in a serum, they complement rather than replace a dedicated ceramide moisturizer. Think of them as a primer for your barrier — helpful, but not a substitute for the main course.

Myth

The reformulated version is just the same product in new packaging.

Reality

The INCI lists are meaningfully different. The reformulation adds hydrolyzed hyaluronic acid (a fifth molecular weight), phospholipids, sphingolipids, tocopherol, and p-anisic acid while reformulating the base to eliminate the sticky texture. This is a genuine upgrade, not a rebrand.

FAQ

Common Praise

"Significantly less sticky texture compared to the original formulation"

"Excellent hydration and plumping effect at a sub-$10 price point"

"Ceramide addition provides noticeable barrier support benefits"

"Layers well under other products without pilling for most users"

"Suitable for use after microneedling and other professional treatments"

Common Complaints

"Some users report pilling when layered under certain sunscreens or makeup"

"A few users experience dryness rather than hydration in very arid climates"

"Review count includes original formulation reviews making it hard to isolate reformulation feedback"

"Dropper dispenses more product than needed per application"

Notable Endorsements

Recommended by Dr. Anne (dermatologist reviewer) as an improvement over the originalFeatured in best-of hydrating serum roundups across major beauty publications

Appears In

best serum for dehydration best serum for dryness best budget hydrating serum best serum for compromised skin barrier best serum for sensitive skin

Related Conditions

dehydration dryness aging compromised skin barrier dullness sensitivity

Related Ingredients

hyaluronic acid ceramides panthenol vitamin b5 phospholipids sphingolipids