Image: theordinary.com
The Ordinary
Marine Hyaluronics
A serum built around Lactic acid and BHA, for hydration and smoothing.
Brand price
USD 8.28 · checked 25 Sept 2026 · on the brand's site
From the brand
What the brand says about this product. Our ingredient analysis follows below.
The brand recommends it for
- Dry skin
- Dryness & dehydration
How to use
Apply a few drops to the face in the morning and evening.
Caution
If irritation occurs, rinse off, cease use, and consult a physician. Use only as directed on unbroken skin. Patch testing prior to use is advised. Keep out of reach of children.
What's inside
Ingredients List
1 trigger at least one check · 32 trigger none
Key Ingredients
Benefits
Hydrating9
Boosts hydration and relieves dry, tight skin.
Algae Extract, Ethoxydiglycol, Glycerin, Histidine, PCA, Propanediol, Pseudoalteromonas Ferment Extract, Sodium Lactate, Sodium PCA
Barrier Repair3
Strengthens and restores the skin's natural barrier.
Smoothing5
Refines rough or uneven texture.
Algae Extract, Caprylyl Glycol, Citric Acid, Salicylic Acid, Sodium Lactate
Concerns
May Worsen Seborrheic Dermatitis1
May feed the yeast involved in seborrheic dermatitis.
May Worsen Keratosis Pilaris1
May clog follicles or strip skin prone to keratosis pilaris.
Ingredients Explained
Click on any ingredient to learn more about it
Aqua
Solvent
Glycerin
Denaturant, Fragrance, Hair Conditioning, Humectant, Oral Care, Perfuming, Humectant, Skin Protecting, Solvent, Viscosity Controlling
Glycerin may be plant, synthetic or animal depending on the supplier.
Learn more about Glycerin →Algae Extract
Fragrance, Humectant, Oral Care, Emollient, Skin Conditioning
Algae Extract (Retired) is the extract of various species of Algae. The INCI Name, Algae Extract, originally published in 1979, was designated with a retired status in 2015. For an interim period of time, trade name assignments formerly published with the INCI Name Algae Extract will be retained in the retired monograph, and also published with the new name assignment based on the current genus and species name for the specific alga.
Learn more about Algae Extract →Pseudoalteromonas Exopolysaccharides
Skin Conditioning
Pseudoalteromonas Exopolysaccharides are the exopolysaccharides excreted by the fermentation of Pseudoalteromonas.
Learn more about Pseudoalteromonas Exopolysaccharides →Pseudoalteromonas Ferment Extract
Humectant
Pseudoalteromonas Ferment Extract is an extract of the product obtained by the fermetation of Pseudoalteromonas
Learn more about Pseudoalteromonas Ferment Extract →Ahnfeltia Concinna Extract
Skin Conditioning
Ahnfeltia Concinna Extract (Retired) is the extract of the alga, Ahnfeltia concinna. The INCI Name, Ahnfeltia Concinna Extract, originally published in 1996, was designated with a retired status in 2015. For an interim period of time, trade name assignments formerly published with the INCI Name Ahnfeltia Concinna Extract will be retained in the retired monograph, and also published with the new name assignment based on the current genus and species name, Ahnfeltiopsis Concinna Extract.
Learn more about Ahnfeltia Concinna Extract →Arginine
Antistatic, Fragrance, Hair Conditioning, Skin Conditioning
L-Arginine
Learn more about Arginine →Glycine
Antistatic, Buffering, Hair Conditioning, Skin Conditioning
Glycine
Learn more about Glycine →Alanine
Antistatic, Fragrance, Hair Conditioning, Skin Conditioning
Alanine
Learn more about Alanine →Serine
Antistatic, Fragrance, Hair Conditioning, Skin Conditioning
2-Amino-3-hydroxypropanoic acid
Learn more about Serine →
Dupes
- The Ordinary Amino Acids + B575% match
- Plum Black Rice & 10% Niacinamide-TXA Night Clarity Jelly Serum66% match
- The Ordinary Multi-Peptide + Copper Peptides 1% Serum66% match
- The Ordinary Multi-Peptide + HA Serum66% match
- Medik8 Exo-PDRN Prismatic+61% match
- Deconstruct Oil Control Serum with 3% Niacinamide & 2% Salicylic Acid With Liposomal Technology60% match