8 Best Hyaluronic Acid Serums for Hydration (September 2026 Honest Reviews

If your skin feels tight, looks dull, or shows fine lines that weren’t there last year, hyaluronic acid serums are the single easiest upgrade you can make to your routine. After testing more than two dozen formulas and comparing tens of thousands of verified reviews, our team found that the right hyaluronic acid serum can plump dehydration lines in a week, strengthen a stressed moisture barrier, and play nicely with every other product in your lineup.

The best hyaluronic acid serums for hydration share three traits: a multi-depth molecular weight structure that hydrates more than just the surface, supporting ingredients like vitamin B5 or ceramides to seal water in, and a fragrance-free formula that doesn’t trigger sensitive skin. The wrong serum, or the right one applied incorrectly, can actually pull moisture out of your skin and leave it flakier than before. We’ve tested them all so you don’t have to.

This guide breaks down the 8 best hyaluronic acid serums for hydration available right now in 2026. We ranked them across 40+ hours of testing and tens of thousands of verified reviews to find the picks that actually deliver plumper, more hydrated skin — whether you’re dealing with a damaged barrier, mature skin, or acne-prone skin that still needs moisture.

Top 3 Hyaluronic Acid Serums at a Glance

Quick Comparison: Best Hyaluronic Acid Serums for Hydration in 2026

1. The Ordinary Hyaluronic Acid 2% + B5 – Editor’s Choice for Multi-Depth Hydration

I have been testing The Ordinary Hyaluronic Acid 2% + B5 for six weeks, and it has earned a permanent spot on my bathroom shelf. The serum combines five different molecular weights of hyaluronic acid with ceramides and pro-vitamin B5, which means it hydrates the surface of the skin while also reinforcing the moisture barrier below. On days when my skin felt parched from air conditioning or late nights, two pumps on damp skin followed by my usual moisturizer left it visibly plumper within an hour.

The texture is what I would call a “true serum”: thin, watery, and fast-absorbing. There is no tacky residue after about 60 seconds, which makes it a perfect base for sunscreen and foundation. I noticed fewer dry flakes around my nose during week two, and the fine lines on my forehead looked softer by week four. With over 40,000 reviews averaging 4.7 stars, I am clearly not the only one who sees results from this budget hyaluronic acid serum.

What sets this formula apart is the inclusion of ceramides alongside the hyaluronic acid. Most budget HA serums stop at hydration; this one also supports the skin’s lipid barrier, which means the water stays locked in instead of evaporating back out. Vitamin B5 (panthenol) adds a soothing layer that calms any redness I get after exfoliating. The formula is also fragrance-free, which matters if you have sensitive skin or rosacea.

In my testing routine, I layered this serum under a niacinamide moisturizer in the morning and under a richer ceramide cream at night. It played nicely with both, never pilling or feeling heavy. The 1 fl oz bottle lasted me roughly six weeks of twice-daily use, making it one of the best value hyaluronic acid serums for hydration on the market. If you can only buy one HA serum, this is the one to get.

Who The Ordinary HA 2% + B5 Is Best For

This serum is ideal if you want serious hydration without paying a premium price, especially if your skin barrier needs extra ceramide support. It works for dry skin, oily skin, combination skin, and sensitive skin alike, and it layers cleanly under makeup and sunscreen. I would skip it if you have very mature skin looking for a heavy anti-aging treatment, since this formula is more about hydration and barrier health than resurfacing.

Who Should Consider a Different Option

If your skin is genuinely aging and you want plumper, more dramatic fine-line reduction, a serum with peptides or growth factors may serve you better. Likewise, if you prefer a richer cream-serum hybrid rather than a watery texture, look at La Roche-Posay Hyalu B5 or CeraVe’s HA serum instead. And if you have acne-prone skin that reacts to anything sticky, Cosmedica’s even simpler formula might be a safer bet.

2. Asterwood Pure Hyaluronic Acid Serum – Best Value Pure Formula

Asterwood’s Pure Hyaluronic Acid Serum is the Oprah’s Editor’s Choice pick that took the skincare world by storm, and after testing it for a month I understand why. It is essentially hyaluronic acid and water, nothing more, which means it hydrates without any extra fragrance, oils, or actives that could conflict with the rest of your routine. For people with reactive or sensitive complexions, that minimalist approach is a gift.

The texture is the lightest of any serum I tested. It feels almost like water on the skin and disappears within seconds. I used it in my morning routine and never noticed pilling under tinted moisturizer or foundation, which is a major plus compared to richer HA serums. Reviewers on Reddit’s r/SkincareAddiction specifically call out Asterwood as one of the best serums for layering with actives like tretinoin and vitamin C.

Where Asterwood shines is versatility. The brand sells the serum in 1, 2, 4, and 8 fl oz bottles, so if you love it you can save by buying the larger size. I went through a 2 fl oz bottle in about two months of twice-daily use, and my skin felt balanced, hydrated, and calm throughout. At this price point, that is hard to beat for a daily-use hyaluronic acid serum.

The only friction I ran into was forgetting to let it fully absorb before applying moisturizer. If you rush, you can end up with a slightly flaky residue. The fix is easy: pat in the serum, wait 30 to 60 seconds, then layer your moisturizer on top. Once I built in that small pause, the results were consistently soft, plump skin without any irritation.

Who Asterwood Pure HA Is Best For

This is the right pick if you want a no-frills, fragrance-free hyaluronic acid serum that does one thing extremely well and lets the rest of your skincare do its job. Sensitive skin, acne-prone skin, and anyone doing professional treatments like microneedling or chemical peels will appreciate how gentle this formula is. It also makes a great starter HA serum if you are just getting into skincare layering.

Who Should Look Elsewhere

If you want a more complete formula that includes ceramides, peptides, or barrier-repair ingredients, The Ordinary HA 2% + B5 is a better value. And if your main concern is mature skin with deep wrinkles, you will likely see more visible improvement from La Roche-Posay Hyalu B5 or a richer serum with multiple molecular weights.

3. Tree of Life Hyaluronic Acid Serum – Best for Sensitive Skin

Tree of Life’s Hyaluronic Acid Serum is the highest-volume pick in this lineup at 2 fl oz, and after using it on my partner’s reactive skin for three weeks, it earned a strong recommendation for anyone whose face flares up at the slightest provocation. The formula is hypoallergenic, dermatologist-tested, and free of the usual irritants like parabens, fragrance, and sulfates. With over 78,000 reviews, it is also one of the most crowd-tested hyaluronic acid serums you can buy.

What surprised me was how comfortable it felt on freshly exfoliated skin. Most HA serums sting slightly when applied right after a chemical exfoliant, but this one absorbed without any redness or tightness. My partner has combination skin that trends sensitive in the winter, and this serum was one of the few products that did not trigger a reaction when humidity dropped.

In addition to hyaluronic acid, the formula includes a small amount of vitamin E and botanical extracts to support hydration without weighing the skin down. It dries down in about 90 seconds to a soft, slightly dewy finish, which worked well under both mineral sunscreen and a heavier night cream. The pump-style dropper is also more travel-friendly than open-mouth bottles, which matters if you want to take it on a flight.

Compared to higher-end serums, Tree of Life’s packaging is minimalist and the label looks simple, but the actual performance rivals formulas two or three times the price. For people just starting a routine or anyone whose skin rejects anything fancy, this is a confidence-builder of a hyaluronic acid serum.

Who Tree of Life HA Serum Is Best For

If you have sensitive skin, eczema-prone skin, or you are pregnant and want to keep your routine minimal, this serum is an easy recommendation. It is also a great choice if you want a 2 fl oz bottle that will last a couple of months without running out. The brand’s cruelty-free and dermatologist-tested credentials are a real plus for anyone shopping with ethics in mind.

Who Should Consider a Different Pick

If your primary skin goal is anti-aging and you want visible wrinkle reduction in addition to hydration, La Roche-Posay Hyalu B5 or The Ordinary HA 2% + B5 will deliver more active ingredients per drop. Likewise, if you have oily skin and want the absolute lightest possible finish, Asterwood or Vichy Mineral 89 will feel even thinner on the skin.

4. La Roche-Posay Hyalu B5 Pure Hyaluronic Acid Serum – Best for Mature Skin

La Roche-Posay Hyalu B5 is the serum I reach for when my skin needs more than just hydration, and after eight weeks of nightly testing I can confirm it lives up to the dermatologist hype. The formula combines pure hyaluronic acid with vitamin B5 and madecassoside (a compound derived from Centella asiatica), making it a triple threat for plumping, soothing, and barrier repair. Clinical testing showed 91% of users felt smoother skin instantly and barrier repair within an hour, and that matched my experience.

The texture is noticeably richer than the other serums in this lineup. It feels more like a thin gel-cream, which is exactly what you want if you have mature skin or a compromised moisture barrier. I tested it on the back of my hands (where fine lines and dryness show up first) and saw visibly plumper skin after about 10 days of nightly use. The formula is also allergy-tested, which matters if your skin reacts to even mild fragrance.

What makes Hyalu B5 stand out for mature skin is the combination of hyaluronic acid with madecassoside. Madecassoside has been studied for its calming and skin-repairing properties, so this serum is essentially doing two jobs at once: hydrating and helping the skin recover from environmental stress. For anyone over 40 dealing with crepey texture or thinning skin, that extra support is worth the price premium.

On the downside, this serum does cost more than budget picks like The Ordinary or Asterwood, and the 1 fl oz bottle is on the smaller side. But a little goes a long way: two to three drops are enough for the entire face, so one bottle lasted me about six weeks with twice-daily use. The lightweight pump dispenser also keeps the formula fresh and makes dosing easy.

Who La Roche-Posay Hyalu B5 Is Best For

This is the right hyaluronic acid serum if you have mature skin, fine lines, or a damaged barrier from over-exfoliating or harsh weather. Sensitive skin types will also appreciate the allergy-tested formula, and anyone using retinoids will find that Hyalu B5 calms the dryness retinoids can cause. If you have normal to dry skin and want a richer serum, this is my top pick in this category.

Who Should Look Elsewhere

If your skin is oily or you live in a humid climate, the richer gel-cream texture may feel too heavy. The Ordinary HA 2% + B5 or Vichy Mineral 89 will be more comfortable for daily use in those conditions. And if you are looking for the cheapest possible HA serum, Asterwood or Cosmedica deliver similar hydration at a fraction of the cost.

5. Vichy Mineral 89 Booster – Best for Barrier Repair and Sensitive Skin

Vichy Mineral 89 Booster is the serum I recommend to anyone who feels like their usual moisturizer is not enough anymore. After four weeks of testing it on dry, winter-stressed skin, I found the combination of hyaluronic acid with polyglutamic acid noticeably more hydrating than HA alone. Polyglutamic acid is a peptide-derived humectant that holds even more water than hyaluronic acid, so the two together create a hydration reservoir that lasts all day.

The texture is light and almost watery, similar to Asterwood but with a slightly more luxurious finish. It absorbs in about 30 to 45 seconds and leaves no sticky residue, which makes it perfect for layering under sunscreen and makeup. I also appreciated that the formula is accepted by the National Eczema Association, meaning it has passed third-party testing for sensitive and eczema-prone skin.

Beyond hydration, Vichy Mineral 89 is built around Vichy Volcanic Water, which contains over 15 minerals that help strengthen the skin barrier. In my testing, I noticed fewer dry patches on my cheeks after about a week of consistent use, and the overall texture of my skin looked smoother. Reviewers with sensitive skin, dry skin, and mature skin consistently report softer, plumper, more even-toned skin with regular use.

Where Vichy Mineral 89 falls slightly short is in treating deeper concerns. If you have very dry skin in a cold climate, you may still need a richer ceramide cream on top to seal everything in. And if your main goal is anti-aging or dark-circle reduction, you will see more impact from a serum with peptides or retinol. But as a daily hydrating booster and barrier-support serum, this is one of the best hyaluronic acid serums for hydration.

Who Vichy Mineral 89 Is Best For

If you have dry skin, dehydrated skin, or a compromised barrier from over-exfoliating, this serum will give you noticeable improvement within the first week. It is also a great choice for sensitive skin and anyone with eczema-prone skin, given the National Eczema Association acceptance. People who live in cold, dry climates will especially appreciate how well it works under a richer moisturizer.

Who Should Consider a Different Option

If your skin is oily or you live in a humid environment, the lightweight gel texture may be all the moisture you need, in which case The Ordinary or Asterwood would be cheaper equivalents. If you are looking for a true anti-aging serum with peptides and growth factors, Alastin or SkinCeuticals will give you more visible results for fine lines and wrinkles.

6. CeraVe Hyaluronic Acid Serum – Best for All Skin Types

CeraVe Hyaluronic Acid Serum is the workhorse pick of this roundup, the one I trust to perform well across every skin type in our testing panel. After six weeks of testing across dry, oily, combination, and sensitive skin types, every tester reported softer, more hydrated skin within the first week. The combination of hyaluronic acid with three essential ceramides (1, 3, and 6-II) and vitamin B5 is what makes this serum stand out from simpler formulas.

The texture is a smooth, lightweight gel that absorbs in about a minute without leaving a tacky finish. CeraVe’s patented MVE (MultiVesicular Emulsion) technology releases hydration slowly over 24 hours, which I noticed particularly when I used this serum under sunscreen on long workdays. By the end of the day, my skin still felt balanced rather than tight or oily.

What makes this serum especially versatile is the ceramide blend. Ceramides are lipids that make up about 50% of your skin barrier, and as we age we produce less of them. Replenishing them topically helps your skin hold onto water and resist environmental damage. For anyone whose barrier has been damaged by over-exfoliating, retinoids, or harsh weather, this serum is a quiet hero.

The formula is also fragrance free and developed with dermatologists, which is why it appears on so many dermatologist-recommended lists. One tester with sensitive skin and rosacea reported zero irritation over six weeks of daily use, which is rare for any active serum. The brand’s reputation for barrier-first formulas means this serum fits naturally into routines for acne-prone skin, eczema-prone skin, and mature skin alike.

Who CeraVe HA Serum Is Best For

This is the right pick if you want one hyaluronic acid serum that works for the entire family or for multiple skin types. It is also a great choice if you are using retinoids or exfoliating acids and need a serum that supports your barrier rather than stressing it. Anyone with dry skin, sensitive skin, or acne-prone skin will appreciate the gentle, fragrance-free formula.

Who Should Look Elsewhere

If you want the lightest possible texture for very oily skin, Asterwood or Vichy Mineral 89 will feel even thinner. And if you want a serum that targets fine lines and wrinkles more aggressively, La Roche-Posay Hyalu B5 includes madecassoside for an extra anti-aging boost that this formula does not have.

7. L’Oreal Paris Revitalift 1.5% Pure Hyaluronic Acid Serum – Best for Layering Under Makeup

L’Oreal Paris Revitalift 1.5% Pure Hyaluronic Acid Serum is the drugstore pick that punches well above its weight, and after five weeks of testing, it earned a place in my morning routine specifically for days when I wear makeup. The formula pairs 1.5% pure hyaluronic acid with vitamin C, which means it hydrates while also adding a subtle brightening effect that makes foundation sit more evenly on the skin.

The texture is a thin gel that disappears in about 45 seconds and leaves a soft, dewy finish without any tackiness. I tested this serum under three different foundations (a matte full-coverage, a satin medium-coverage, and a tinted moisturizer) and never noticed pilling or balling up, which is the most common complaint with cheaper HA serums. With over 49,000 reviews, it is one of the most crowd-tested hydrating serums in the drugstore category.

What sets this serum apart is the combination of low and high molecular weight hyaluronic acid. Low molecular weight HA penetrates deeper into the skin for longer-lasting hydration, while high molecular weight HA sits on the surface to give an immediate plumping effect. Together, they create both instant glow and all-day moisture, which is what you want in a morning serum.

The only real caveat is that this serum works best in small doses. I learned the hard way that applying more than two or three drops can lead to pilling under foundation, especially if you layer it with silicone-based primers. Once I dialed back the amount, it became one of my favorite hydrating primers. The fragrance-free formula is also a major plus for anyone with sensitive skin.

Who L’Oreal Revitalift HA Is Best For

If you want a drugstore hyaluronic acid serum that doubles as a makeup primer, this is the one. It is also a great pick for mature skin that wants the brightening boost from vitamin C alongside hydration. Anyone with combination skin will appreciate the lightweight gel texture that does not feel heavy in the T-zone.

Who Should Consider a Different Option

If you want a true ceramide-rich formula for barrier repair, The Ordinary HA 2% + B5 or CeraVe HA Serum are better picks. And if you prefer the lightest possible water-like finish for layering under other actives, Asterwood or Cosmedica will feel even thinner on the skin.

8. Cosmedica Skincare Pure Hyaluronic Acid Serum – Best for Acne-Prone Skin

Cosmedica Skincare Pure Hyaluronic Acid Serum is the longest-running cult favorite in this roundup, with more than 49,000 reviews and a 4.4-star average that has barely budged in years. After testing it for six weeks on combination, acne-prone skin, I can confirm it earns its reputation. The formula is essentially hyaluronic acid in a water-based serum, with a short ingredient list that leaves little room for pore-clogging extras.

What I appreciated most was how well this serum played with my other acne products. I used it alongside salicylic acid in the morning and a benzoyl peroxide treatment at night, and it never broke me out or interfered with either active. The non-greasy, fast-absorbing texture means it does not sit on top of the skin or trap sebum, which is critical for anyone whose skin breaks out easily.

Cosmedica’s formula also includes vitamin C and vitamin E for a subtle brightening effect, but the star is still the hyaluronic acid, which the brand claims holds up to 1,000 times its weight in water. I cannot verify that exact number, but my skin did feel noticeably more hydrated after two weeks of consistent use, and the dull, post-inflammatory marks on my cheek looked softer by week four.

The main learning curve is application. Like most HA serums, this one works best on damp skin. If you apply it to a fully dry face, you risk pulling moisture out of the skin rather than locking it in. After a few tries I got into the habit of applying it within 60 seconds of cleansing while my skin was still slightly damp, and the results were consistently good.

Who Cosmedica Pure HA Is Best For

This is the right pick if you have acne-prone skin, oily skin, or sensitive skin and want a hyaluronic acid serum that will not clog pores or trigger breakouts. It is also a great choice if you prefer a short, transparent ingredient list and a brand that has been around long enough to earn consumer trust. Anyone looking for a budget-friendly daily serum will appreciate the 2 fl oz size at this price.

Who Should Consider a Different Option

If your primary goal is anti-aging or barrier repair, La Roche-Posay Hyalu B5 or The Ordinary HA 2% + B5 will deliver more targeted ingredients. And if you want a serum with a more luxurious texture or richer finish, Vichy Mineral 89 or CeraVe HA Serum will feel more substantial on the skin.

How Hyaluronic Acid Serums Work: The Science Behind the Hydration

Hyaluronic acid is a sugar molecule that occurs naturally in your skin, joints, and connective tissue. One gram of hyaluronic acid can hold up to six liters of water, which is why it is the gold-standard humectant in skincare. When you apply a hyaluronic acid serum to damp skin, the molecule attracts water from the environment and from deeper layers of your skin, holding it at the surface where it visibly plumps fine lines and restores bounce.

There are three main molecular weights of hyaluronic acid used in skincare, and they behave differently on the skin. High molecular weight HA sits on the surface and gives immediate plumping, but it can feel sticky if not formulated well. Low molecular weight HA penetrates deeper for longer-lasting hydration, though some dermatologists have raised concerns about potential pro-inflammatory effects at very low weights. Cross-linked HA is engineered to last longer on the skin and resist breaking down, making it ideal for mature skin that needs extended hydration.

The best hyaluronic acid serums combine multiple molecular weights for both immediate and long-term hydration. The Ordinary HA 2% + B5 uses five different weights, while Vichy Mineral 89 layers hyaluronic acid with polyglutamic acid for an even stronger moisture reservoir. If you have sensitive skin or a damaged barrier, look for formulas that also include ceramides, vitamin B5 (panthenol), or madecassoside for added barrier support.

For more ways to think about daily hydration beyond skincare, our team has tested the best hydration packs for hiking and insulated water bottles for daily hydration, both of which round out a hydration-focused lifestyle.

How to Choose the Right Hyaluronic Acid Serum for Your Skin

Choosing a hyaluronic acid serum is less about the brand name and more about how the formula fits your skin type, climate, and other products. Here are the four things our team considers before recommending any HA serum.

Concentration and Molecular Weight

Most dermatologists recommend hyaluronic acid serums in the 0.5% to 3% concentration range. Higher is not always better: a 2% formula can feel sticky or pill under makeup if it is not paired with the right supporting ingredients. Look for serums that combine multiple molecular weights (low, medium, and high) to hydrate both the surface and deeper layers of the skin. The Ordinary’s 2% formula with five molecular weights is a great example, as is L’Oreal’s 1.5% pure HA with low and high weights.

Supporting Ingredients

The best hyaluronic acid serums pair HA with complementary actives. Vitamin B5 (panthenol) soothes and supports moisture retention. Ceramides help seal the skin barrier and prevent water loss. Niacinamide adds brightening and anti-inflammatory benefits. Madecassoside (from Centella asiatica) calms redness and supports barrier repair. For mature skin, peptides and proxylane can add anti-aging benefits on top of hydration.

Skin Type Matching

For dry skin, choose richer formulas with ceramides and vitamin B5 like CeraVe HA Serum or La Roche-Posay Hyalu B5. For oily skin and acne-prone skin, stick to lightweight, fragrance-free, non-comedogenic formulas like Cosmedica or Asterwood. For sensitive skin, prioritize fragrance-free, allergy-tested formulas like Tree of Life or Vichy Mineral 89. For mature skin, look for HA combined with peptides, madecassoside, or polyglutamic acid.

Climate and Lifestyle

Hyaluronic acid serums behave differently depending on humidity. In humid climates, HA pulls water from the air and a single layer is usually enough. In dry climates, HA can actually pull water out of your skin if applied without a moisturizer on top, so layering with a richer cream is essential. If you live in a cold, dry region, Vichy Mineral 89 or CeraVe HA Serum with ceramides will help lock in moisture.

How to Apply Hyaluronic Acid Serum Correctly

Application method matters as much as the formula you choose. The most common mistake, which Reddit’s r/SkincareAddiction has flagged in viral posts, is applying hyaluronic acid serum to dry skin. When HA encounters a dry surface with no water available, it pulls moisture out of the deeper layers of your skin, leaving you more dehydrated than before.

The correct routine is simple. Start by cleansing with a gentle, non-stripping cleanser. Within 60 seconds of cleansing, while your skin is still slightly damp, apply two to three drops of hyaluronic acid serum to your face and neck. Pat the serum in rather than rubbing, then immediately follow with a moisturizer to seal the water in. Finish with sunscreen in the morning.

If you use other actives like retinol, vitamin C, or exfoliating acids, the layering order matters. Apply hyaluronic acid serum after water-based serums and before oils or heavy creams. Many people on Reddit report mixing one to two drops of HA serum directly into their moisturizer for an extra hydration boost, which works well if you are short on time.

Common Mistakes to Avoid With Hyaluronic Acid Serums

The four most common mistakes our team sees are easy to avoid once you know what to look for. First, never apply HA serum to completely dry skin; always use it on damp skin or with a damp hands technique. Second, do not skip the moisturizer on top; HA is a humectant, not an occlusive, so it pulls water in but does not seal it in.

Third, avoid layering too many HA serums at once. Stacking multiple hyaluronic acid products rarely increases hydration and often leads to pilling under sunscreen or makeup. One well-formulated serum is enough. Fourth, watch for irritation: while rare, some people experience redness or breakouts from very low molecular weight HA. If that happens, switch to a higher molecular weight formula or a simpler pure HA serum.

For readers building out a complete skincare routine, our related guides on the best hair growth serums for women cover scalp and hair hydration from a similar ingredient-forward perspective.

Frequently Asked Questions

Final Verdict: Which Hyaluronic Acid Serum Should You Buy?

After 40+ hours of testing and reviewing tens of thousands of verified customer reviews, our top pick for the best hyaluronic acid serum for hydration in 2026 is The Ordinary Hyaluronic Acid 2% + B5. It combines five molecular weights of hyaluronic acid with ceramides and vitamin B5 to deliver multi-depth hydration, barrier support, and impressive plumping at a price most routines can afford. With a 4.7-star average across more than 40,000 reviews, it is also one of the most crowd-tested formulas available.

For a tighter budget, Asterwood Pure Hyaluronic Acid Serum offers a clean, fragrance-free formula that layers well with any routine. For sensitive skin, Tree of Life Hyaluronic Acid Serum delivers hypoallergenic hydration that has been tested on tens of thousands of reactive complexions. For mature skin, La Roche-Posay Hyalu B5 combines HA with madecassoside for a richer, anti-aging boost. And for a drugstore pick that doubles as a hydrating primer, L’Oreal Paris Revitalift 1.5% Pure HA is hard to beat.

Whichever serum you choose, remember the golden rule: apply on damp skin, seal with a moisturizer, and use it consistently for at least four weeks before judging the results. The best hyaluronic acid serums for hydration are simple, evidence-backed, and easy to fit into any routine. Your skin will thank you.