Dr. Althea Aqua Marine Deep Serum — Efficacy 4.2/5.0, Safety 4.8/5.0 | DemythSkin
++++
[ DemythSkin Verdict ]
Dr. Althea Aqua Marine Deep Serum
Dr. Althea

Dr. Althea Aqua Marine Deep Serum

SerumHydration
Efficacy
Strong
4.2 / 5.0
Safety
Excellent
4.8 / 5.0
System Verdict
A competent hydration serum, but the headline hype is doing more work than the formula. The efficacy score is driven mainly by a solid humectant base (glycerin, propanediol, sodium hyaluronate, crosspolymer hyaluronate, hydrolyzed hyaluronic acid) plus supportive soothing/barrier ingredients like panthenol, centella, and niacinamide; however, niacinamide is not especially high enough to promise strong brightening, and several botanical/ferment/seaweed ingredients are more supportive than truly transformative. There is no obvious pH-sensitive treatment active here, so this is best judged as a well-built hydration and soothing serum rather than a high-impact treatment formula.
Active Ingredients Detected
A Tier: Good BasicsProven Results
GlycerinNiacinamidePanthenolLactococcus Ferment LysateSodium HyaluronateAdenosineSodium Hyaluronate CrosspolymerHydrolyzed Hyaluronic Acid
B Tier: Supporting IngredientsPromising Ingredients
RaffinoseFructooligosaccharidesCentella Asiatica ExtractSodium ChlorideMaltodextrinGuaiazuleneDimethyl IsosorbideOleyl Alcohol
C Tier: Marketing IdolsHype | Limited or Weak Data
Cyperus Rotundus Root ExtractSodium DnaAgave Tequilana Leaf ExtractHydrolyzed Gardenia Florida ExtractHizikia Fusiforme ExtractSargassum Fulvellum ExtractLaminaria Japonica ExtractCaulerpa Lentillifera Extract
What Each Ingredient Does
Water
solvent base
1,2-Hexanediol
humectant preservative
Water
solvent base
Glycerin
humectant
Ethylhexylglycerin
preservative booster
Niacinamide
barrier-supporting brightener
Raffinose
humectant sugar
Panthenol
soothing humectant
Propanediol
solvent humectant
Xanthan Gum
thickener stabilizer
Lactococcus Ferment Lysate
ferment extract
Fructooligosaccharides
prebiotic humectant
Centella Asiatica Extract
soothing botanical extract
Cyperus Rotundus Root Extract
botanical extract
Sodium Chloride
viscosity modifier
Sodium Hyaluronate
humectant polymer
Adenosine
skin conditioning active
Tromethamine
pH adjuster
Carbomer
gelling agent
Disodium Edta
chelating agent
Sodium Dna
marketing-oriented conditioner
Agave Tequilana Leaf Extract
botanical extract
Maltodextrin
carrier binder
Hydrolyzed Gardenia Florida Extract
botanical extract
Full Ingredient List (INCI)

Water, 1,2-Hexanediol, Water, Glycerin, Ethylhexylglycerin, Niacinamide, Raffinose, Panthenol, Propanediol, Xanthan Gum, Lactococcus Ferment Lysate, Fructooligosaccharides, Centella Asiatica Extract, Cyperus Rotundus Root Extract, Sodium Chloride, Sodium Hyaluronate, Adenosine, Tromethamine, Carbomer, Disodium Edta, Sodium Dna, Agave Tequilana Leaf Extract, Maltodextrin, Hydrolyzed Gardenia Florida Extract, Hizikia Fusiforme Extract, Sargassum Fulvellum Extract, Laminaria Japonica Extract, Butylene Glycol, Caulerpa Lentillifera Extract, Guaiazulene, Sodium Hyaluronate Crosspolymer, Dimethyl Isosorbide, Oleyl Alcohol, Hydrolyzed Hyaluronic Acid

Frequently Asked

Is Dr. Althea Aqua Marine Deep Serum worth it?

Dr. Althea Aqua Marine Deep Serum scores 4.2 out of 5.0 for efficacy (Strong) and 4.8 out of 5.0 for safety (Excellent) on DemythSkin's independent ingredient analysis. A competent hydration serum, but the headline hype is doing more work than the formula. The efficacy score is driven mainly by a solid humectant base (glycerin, propanediol, sodium hyaluronate, crosspolymer hyaluronate,

What are the key active ingredients in Dr. Althea Aqua Marine Deep Serum?

Dr. Althea Aqua Marine Deep Serum contains no gold-standard actives — its formula is built on supporting and base ingredients rather than clinically transformative actives.

Does Dr. Althea Aqua Marine Deep Serum contain fragrance or known irritants?

DemythSkin's analysis found no flagged irritants in Dr. Althea Aqua Marine Deep Serum. It scores 4.8 out of 5.0 for safety.

How is Dr. Althea Aqua Marine Deep Serum 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.

Buy on Amazon Analyze on DemythSkin

Analysis last updated: 2026-09-16. DemythSkin is an independent ingredient analyzer. Scores are computed by a deterministic rubric from published clinical evidence — no brand pays for a score. DemythSkin earns commission from affiliate links (Amazon Associates and others). Scores are computed before any commercial relationship — the link follows the verdict, never the other way around.