WOWMD called last month asking me to weigh in on the best hyaluronic acid serums on the market, alongside a colleague in Sydney. It’s a good question, and most of the coverage out there skips the one detail that actually determines whether a serum does anything at all.
Here’s the honest version.
What Topical HA Actually Is
Hyaluronic acid is not exotic. A topical HA serum is, at its core, water and hyaluronic acid. The molecule pulls moisture to the top layer of skin and holds it there, which is why skin looks plumper and fine lines look softer within an hour of applying it.
That’s the whole mechanism. It’s a humectant, not a filler. It doesn’t rebuild collagen, it doesn’t penetrate the dermis, and it doesn’t do what an injectable HA filler does. Anyone marketing a topical serum as a filler alternative is overselling it.
The Detail Everyone Skips: Molecular Weight
Hyaluronic acid comes in different molecular weights, and the weight determines where it sits in the skin.
High molecular weight HA stays on the surface. It forms a film that holds moisture in and slows water evaporation through the day. Low molecular weight HA is a smaller molecule, so it penetrates further, into the epidermis, where it can do more for texture and fine lines.
A serum with only high molecular weight HA gives you surface hydration and not much else. A serum with only low molecular weight HA penetrates but doesn’t hold onto surface moisture well on its own. The serums that actually perform well blend both, so you get the surface film and the deeper hydration at the same time. If a label doesn’t tell you which type is in the bottle, that’s worth noticing.
What to Pair It With
HA serum works better with support. Niacinamide protects the skin barrier. Ceramides help repair it. Peptides stimulate collagen production over time, which topical HA alone does not do. Glycerin is another humectant that works alongside HA rather than competing with it.
A serum built around HA plus one or two of these supporting ingredients does more than HA on its own, in my experience watching what patients respond to.
Who Actually Benefits
Dehydrated skin is the clearest case. So is anyone recovering from a procedure or using a retinoid, since both can leave skin temporarily more prone to water loss and a good HA serum offsets that. People in arid climates lose more surface moisture day to day, so the film effect of high molecular weight HA does real work there. And perimenopausal and postmenopausal women dealing with estrogen-driven dryness are a group I see benefit consistently, since declining estrogen affects the skin’s own moisture retention independent of anything topical.
Who Should Be Careful
Sensitive or broken skin, an active rosacea flare, a known preservative sensitivity like methylparaben, or a recent aggressive peel or laser session are all reasons to hold off or check with whoever did the procedure first. HA itself is about as low-risk as skincare gets, but the rest of the formula around it isn’t always.
About Dr. Frank Agullo
Frank Agullo, MD, FACS, is double board-certified by the American Board of Plastic Surgery and the American Board of Surgery and a Fellow of the American College of Surgeons. He completed his plastic surgery fellowship at Mayo Clinic and serves as a Clinical Associate Professor of Plastic Surgery at Texas Tech University Health Sciences Center Paul L. Foster School of Medicine. He has been named a Castle Connolly Top Doctor for thirteen consecutive years.
Ready to Talk?
A good skincare routine and a surgical consultation are different conversations, but they start the same way: an honest look at what your skin actually needs.
Call (915) 590-7900, text 1-866-814-0038, or book online at agulloplasticsurgery.com/appointments. #StayBeautiful.
@RealDrWorldWide on Instagram, TikTok, and Snapchat, @Agullo on X, or @AgulloPlasticSurgery on Facebook.
Cross-links
- Patient-facing version on agulloplasticsurgery.com: “Choosing a Hyaluronic Acid Serum: What Your Skin Actually Needs” (link once live)
- Practice version on swplasticsurgery.com: “Southwest Plastic Surgery’s Take on Hyaluronic Acid Serums” (link once live)
- Source: WOWMD, “9 Best Hyaluronic Acid Serums for Smooth, Hydrated Skin,” WOWMD Staff, July 23, 2026. https://www.wowmd.com/blogs/wellness/best-hyaluronic-acid-serums