Side-by-side comparison

The Inkey List Polyglutamic Acid Serum vs The Ordinary Marine Hyaluronics

Neither serum relies on a targeted treatment active; both are about comfort and skin support. They share Hyaluronic Acid, so texture, price and the rest of the formula decide it.

1Shared hero active
The Inkey List
Polyglutamic Acid Serum
SerumBudgetMorning or evening
DehydrationDullnessDryness

A hydration serum using polyglutamic acid, which holds even more water than hyaluronic acid, layered with HA. A lightweight, plumping hydrator that works well over or under HA; an affordable way to trial the ingredient.

Full analysis →Find dupes →
The Ordinary
Marine Hyaluronics
SerumBudgetMorning or evening
DehydrationOilinessDullness

An ultra-light hydrating serum using marine-derived humectants instead of classic hyaluronic acid, for a weightless, almost water-like feel. A good layering hydrator for oily skin that finds HA serums tacky.

Full analysis →Find dupes →
The verdict

Which should you choose?

Both lean on Hyaluronic Acid for hydration and support. The Inkey List Polyglutamic Acid Serum adds Polyglutamic Acid. The Ordinary Marine Hyaluronics adds Marine Humectants. The Inkey List Polyglutamic Acid Serum is the better fit for dryness; The Ordinary Marine Hyaluronics for oiliness. Both sit in the Budget price tier.

The overlap

What they share

This hero active appears in both formulas:

Hyaluronic Acid
The formulation

Ingredient stacks, side by side

The Inkey List Polyglutamic Acid Serum — top of the list

  • Aqua~50–80%
  • Glycerin~5–25%
  • Polyglutamic Ac…~3–10%
  • Sodium Hyaluron…~2–6%
  • Propanediol~1.5–4%
  • Panthenol~1–2%

The Ordinary Marine Hyaluronics — top of the list

  • Aqua~50–80%
  • Glycerin~5–25%
  • Propanediol~3–10%
  • Amino Esters-1~2–6%
  • Sodium Hyaluron…~1.5–4%

● marks ingredients that appear near the top of both lists. Percentages are positional estimates from INCI order, not disclosed doses.

At a glance

The specs

The Inkey List Polyglutamic Acid SerumThe Ordinary Marine Hyaluronics
CategorySerumSerum
Price tierBudgetBudget
Best forDehydration, Dullness, DrynessDehydration, Oiliness, Dullness
Usage notesMorning or eveningMorning or evening
Shared hero activesHyaluronic Acid
Questions

Common questions

Is The Inkey List Polyglutamic Acid Serum or The Ordinary Marine Hyaluronics better?
Neither is a treatment product, so it comes down to feel and fit. Both use Hyaluronic Acid; pick on price, texture and the concerns each suits.
What's the difference between The Inkey List Polyglutamic Acid Serum and The Ordinary Marine Hyaluronics?
The Inkey List Polyglutamic Acid Serum's hero actives are Polyglutamic Acid and Hyaluronic Acid. The Ordinary Marine Hyaluronics's are Marine Humectants and Hyaluronic Acid.
Are The Inkey List Polyglutamic Acid Serum and The Ordinary Marine Hyaluronics dupes for each other?
They're similar in role: both rely on Hyaluronic Acid for support rather than a targeted active. Texture and the rest of the formula will still feel different.
Can I use The Inkey List Polyglutamic Acid Serum and The Ordinary Marine Hyaluronics together?
Usually, yes. Apply the thinner texture first, then the thicker one, and patch-test when introducing anything new.
Keep comparing

Related comparisons

The Inkey List Polyglutamic Acid Serum vs Vichy Minéral 89 Hyaluronic Acid Booster
1 shared hero activeNeutrogena Rapid Wrinkle Repair Retinol Oil vs The Inkey List Polyglutamic Acid Serum
1 shared hero activeThe Inkey List Hyaluronic Acid Serum vs The Inkey List Polyglutamic Acid Serum
1 shared hero activeHaruharu Wonder Black Rice Hyaluronic Serum vs The Inkey List Polyglutamic Acid Serum
1 shared hero activeThe Inkey List Niacinamide Serum vs The Inkey List Polyglutamic Acid Serum
1 shared hero activeThe Inkey List Polyglutamic Acid Serum vs The Ordinary Hyaluronic Acid 2% + B5
1 shared hero active

Want a deeper, personalised read? Drop both products into the live comparison tool for an ingredient-by-ingredient breakdown tuned to your skin profile.

Compare these yourself →