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The Ordinary

Marine Hyaluronics.

The Ordinary Marine Hyaluronics
Serums

About this product

A lightweight hydrating serum combining hyaluronic acid with marine extracts, red algae, amino acids, and a fermented marine bacteria complex designed to plump and hydrate the skin.

Best for

Type

Key actives

Formula notes

Fragrance-freeNo drying alcohol

Full ingredients

Guru Score

86%

Approved

4 experts · Moderate agreement
4Gurus
4Approved
0Mixed
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What the gurus are saying

This serum's watery, almost-liquid texture makes it exceptionally easy to layer without feeling heavy, and gurus praise it as a reliable alternative to standard hyaluronic acid serums, especially for those who find typical HA sticky or prone to pilling. The marine extracts and algae deliver hydration without the risk of drawing moisture from deeper skin layers the way hyaluronic acid can in dry climates, making it gentler in arid environments. Apply it to damp skin before other moisturizers or serums for best absorption and that plumped, dewy finish.
Synthesized from 4 expert reviews · most recent take April 2026
Every take, in full

What the gurus are saying.

Every take we've logged from this product's reviews across YouTube. Click any row to watch the moment they said it.

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Approved
"The Marine Hyaluronics are super lightweight, watery, liquid, hydrating ingredients. You want to layer this under other moisturizers or serums, but it's really nice, lightweight, super affordable. Probably one of the more lightweight products that exist, and it just feels really nice and hydrating on your skin."
All 3 takes from No BS Beauty
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"I've repurchased this now, I believe this is my third bottle. I'm not a crazy fan of hyaluronic serums in general, I think it's just kind of a simple basic ingredient, but this stuff is just wonderful. It's super light so you can add it to your routine almost like an essence or a toner and it just gives you so much moisture. I would say this one is really great for dehydrated skin types. It's super liquidy, almost more liquidy than water, so it's hard to use it without feeling like you're wasting it. But I love it. It's really easy to fit in your routine and it has some really nice ingredients in it, simple and affordable."
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"The Marine Hyaluronics are super lightweight, watery, liquid, hydrating ingredients. You want to layer this under other moisturizers or serums, but it's really nice, lightweight, super affordable. Probably one of the more lightweight products that exist, and it just feels really nice and hydrating on your skin."
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"This is my third bottle of the Marine Hyaluronics, it's seven bucks, it's a super lightweight serum. There's a lot of hydrating serums, this one is super super super lightweight, lighter texture than water. I think this one's probably best during the summer or to layer it with other products, but it is very very liquidy. You can apply this after toning and then go with your serum or moisturizer. In here we've got red marine algae, we've got algae extract, we got 11 different amino acids, then we've got pseudo ultramon ferment extract, which is a biotechnologically derived ingredient produced by the fermentation of marine bacteria living in the cold Antarctic ocean. It has skin protecting properties as well as protects skin from dryness and redness specifically due to cold weather, probably because it comes from cold weather. This ferment can also help promote skin regeneration and smoothing of skin surface by stimulating protein synthesis in skin. So it's so affordable but for seven bucks you can't beat it, it's really nice."
Approved
"This is very similar and comparable to hyaluronic acid but the texture and the formulation of this serum is completely different. It's very thin and watery. It doesn't leave your skin tacky or sticky. It still hydrates and plumps your skin, but we have red algae in here and it just contains different ingredients. So if you don't like that heavy sticky tacky feel of hyaluronic acid, then you may want to look into the Marine Hyaluronics. If you still want something that is even lighter and even thinner on the skin, try the Marine Hyaluronics."
Top Pick: serum for dryness and tightness
All 5 takes from Sincerely Miss Ash
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"Somebody asked me how this compares to The Ordinary Marine Hyaluronics. Very similar, especially in texture, but I like this better. I like this way better than Marine Hyaluronics."
MY MORNING ANTI-AGING SKINCARE ROUTINE | A.M. SUMMER SKINCARE ROUTINE | OVER 30
"The Ordinary Marine Hyaluronics is very similar to hyaluronic acid in the way that it plumps and hydrates the skin, but this is very very lightweight, like water. It spreads nicely and absorbs into the skin really well. I've never experienced peeling with this, but sometimes with The Ordinary hyaluronic acid serum sometimes I do experience pilling. I like this one more for the summer because of how lightweight it is. I do like to put one syringe full of this because I love that hydrated plump look. I do like to put this onto damp skin as well for better absorption, especially when you're using hyaluronic acids or the Marine Hyaluronics. You do want to put these onto damp skin so that you do get that better absorption. It just works so much better when you want that plumper hydrated look."
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"This is very similar and comparable to hyaluronic acid but the texture and the formulation of this serum is completely different. It's very thin and watery. It doesn't leave your skin tacky or sticky. It still hydrates and plumps your skin, but we have red algae in here and it just contains different ingredients. So if you don't like that heavy sticky tacky feel of hyaluronic acid, then you may want to look into the Marine Hyaluronics. If you still want something that is even lighter and even thinner on the skin, try the Marine Hyaluronics."
PRODUCT'S I'VE USED UP | WOULD I REPURCHASE? BEAUTY EMPTIES 2023
"If you like hyaluronic acids but you don't like how they feel sticky and tacky on the skin, maybe you're experiencing pilling with hyaluronic acids, then I would say go with the Marine Hyaluronics. This is going to be plumping and hydrating. It's great for your morning and for your evening. I go through a bottle every single month, so I always have backups of that."
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"This is another underrated serum from The Ordinary and this is exceptional for those that have dryness and tightness to their skin. This is very very unique. I haven't found a serum that is similar to this yet. This one acts as your hyaluronic acid alternative so if you don't like hyaluronic acid then I would say go with Marine Hyaluronics because this serum is still going to plump and hydrate your skin no different than hyaluronic acid but this formula is thinner, it's not greasy, it's not heavy and it's like water so your skin absorbs this really nicely. There is no peeling and you can also use this everyday twice a day. This contains skin-friendly Marine bacteria but it also contains Hawaiian red algae and microfiltered blue green algae. This also contains amino acids and there are several types of amino acids in the formulation. This serum alone is exceptional to hydrate and to keep your skin nice and comfortable."
Approved
"The Ordinary makes a wonderful hydrating serum, the Marine Hyaluronics. I highly recommend it. It keeps the top layers of the skin hydrated and ultimately that smooths out fine lines and skin texture. It also helps support skin barrier turnover because the hydration that is held there in place allows the enzymes and the skin barrier to function better and ultimately that supports cell turnover. You also have glycerin which can penetrate a little bit more deeply to hydrate the skin. You have marine extracts which are very, very hygroscopic."
Approved
"The Marine Hyaluronics actually uses marine extract to give a more multi-dimensional, multi-level hydration experience. And it delivers that. You will get a better level of hydration from the Marine Hyaluronics than you will from the hyaluronic acid. It's also less likely to cause dryness because it works in a subtly different way. Hyaluronic acid is a humectant which draws in moisture. And if you're living in quite a dry and arid environment, it can actually end up sucking moisture from the deeper levels of the skin, actually being counterintuitive and dehydrating. You don't get that risk with the Marine Hyaluronics. It's just adding in that hydration. I use this on the neck, I use it on the elbows where I'm dry. Put a little of this on, top it off with a moisturizer. You can always use this under a hand cream. That's a great way of elevating the moisture you see in your hands. It's just amazing."
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Common questions

Frequently asked.

What is The Ordinary Marine Hyaluronics?

A lightweight hydrating serum combining hyaluronic acid with marine extracts, red algae, amino acids, and a fermented marine bacteria complex designed to plump and hydrate the skin.

Is The Ordinary Marine Hyaluronics worth it?

Yes. All 4 gurus who reviewed it give it their stamp of approval, for a Guru Score of 86%.

What is The Ordinary Marine Hyaluronics's Guru Score?

The Ordinary Marine Hyaluronics holds a Guru Score of 86%. That is our read on how warmly the experts talk about it, based on the verdicts of 4 independent expert reviewers we have collected. At least one expert has named it a Top Pick in its category.

Who is The Ordinary Marine Hyaluronics best for?

The Ordinary Marine Hyaluronics is generally suited to dry skin.

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