The Ordinary Marine Hyaluronics — Efficacy 4.1/5.0, Safety 4.4/5.0 | DemythSkin
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[ DemythSkin Verdict ]
The Ordinary Marine Hyaluronics
The Ordinary

The Ordinary Marine Hyaluronics

SerumHydration
Efficacy
Strong
4.1 / 5.0
Safety
Safe
4.4 / 5.0
System Verdict
Hydration is the only real job here, and the formula does that well. The score is driven by a strong humectant base (glycerin, PCA salts, sodium lactate, propanediol, amino acids) plus marine extracts that support water binding, while salicylic acid sits far enough down the list that it is unlikely to meaningfully exfoliate in this leave-on serum; there is no evidence of a dedicated brightening or anti-aging active at clinically compelling strength.
Active Ingredients Detected
S Tier: Gold StandardsHigh Clinical Proof | Skin-Transformative
Salicylic Acid
A Tier: Good BasicsProven Results
GlycerinPseudoalteromonas Ferment ExtractGlycineAlanineSerineValineIsoleucineProlineThreonineHistidinePhenylalanineSodium PCA
B Tier: Supporting IngredientsPromising Ingredients
Aspartic AcidPcaDimethyl IsosorbideEthoxydiglycolSodium SalicylateHexylene Glycol
C Tier: Marketing IdolsHype | Limited or Weak Data
Algae ExtractAhnfeltia Concinna Extract
What Each Ingredient Does
Aqua
solvent
Glycerin
humectant
Algae Extract
marine humectant
Pseudoalteromonas Ferment Extract
marine ferment humectant
Ahnfeltia Concinna Extract
red algae extract
Arginine
amino acid humectant
Glycine
amino acid humectant
Alanine
amino acid humectant
Serine
amino acid humectant
Valine
amino acid humectant
Isoleucine
amino acid humectant
Proline
amino acid humectant
Threonine
amino acid humectant
Histidine
amino acid humectant
Phenylalanine
amino acid humectant
Aspartic Acid
amino acid humectant
Pca
natural moisturizing factor
Sodium PCA
natural moisturizing factor
Sodium Lactate
humectant and NMF
Salicylic Acid
beta hydroxy acid
Citric Acid
pH adjuster
Propanediol
solvent and humectant
Dimethyl Isosorbide
solvent and penetration aid
Ethoxydiglycol
solvent and carrier
Full Ingredient List (INCI)

Aqua, Glycerin, Algae Extract, Pseudoalteromonas Ferment Extract, Ahnfeltia Concinna Extract, Arginine, Glycine, Alanine, Serine, Valine, Isoleucine, Proline, Threonine, Histidine, Phenylalanine, Aspartic Acid, Pca, Sodium PCA, Sodium Lactate, Salicylic Acid, Citric Acid, Propanediol, Dimethyl Isosorbide, Ethoxydiglycol, Polysorbate 20, Potassium Sorbate, Sodium Salicylate, Sodium Benzoate, Hexylene Glycol, 1,2-Hexanediol, Phenoxyethanol, Caprylyl Glycol

Frequently Asked

Is The Ordinary Marine Hyaluronics worth it?

The Ordinary Marine Hyaluronics scores 4.1 out of 5.0 for efficacy (Strong) and 4.4 out of 5.0 for safety (Safe) on DemythSkin's independent ingredient analysis. Hydration is the only real job here, and the formula does that well. The score is driven by a strong humectant base (glycerin, PCA salts, sodium lactate, propanediol, amino acids) plus marine extracts that support water

What are the key active ingredients in The Ordinary Marine Hyaluronics?

The Ordinary Marine Hyaluronics contains these gold-standard actives with strong clinical evidence: Salicylic Acid.

Does The Ordinary Marine Hyaluronics contain fragrance or known irritants?

DemythSkin's analysis found no flagged irritants in The Ordinary Marine Hyaluronics. It scores 4.4 out of 5.0 for safety.

How is The Ordinary Marine Hyaluronics scored?

DemythSkin grades every product on two independent axes: efficacy (whether the ingredients have clinical evidence of working) and safety (irritation and sensitisation risk). Ingredients are classified S through D against a database of over 3,000 compounds. No brand pays for a score.

Analyze on DemythSkin →

Analysis last updated: 2026-08-12. DemythSkin is an independent ingredient analyzer. Scores are computed by a deterministic rubric from published clinical evidence — no brand pays for a score.