Side-by-side comparison

The Inkey List Polyglutamic Acid Serum vs The Ordinary Marine Hyaluronics

Both are serums. They share a 70% active-ingredient overlap, so the real decision is about price, texture and the supporting ingredients. Here's the side-by-side.

70%Active overlap
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.

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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.

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The verdict

Which should you choose?

Both sit in the Budget tier, so cost isn't the deciding factor here — choose on texture, finish and the supporting ingredients. The The Inkey List leans toward Dryness. The The Ordinary leans toward Oiliness.

The overlap

What they share

At 70% active overlap, these are the ingredients doing comparable work in both formulas:

Hyaluronic Acid
The formulation

Ingredient stacks, side by side

The Inkey List — 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 — 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 ListThe Ordinary
CategorySerumSerum
Price tierBudgetBudget
Best forDehydration, Dullness, DrynessDehydration, Oiliness, Dullness
Usage notesMorning or eveningMorning or evening
Active overlap70% — Hyaluronic Acid
Questions

Common questions

Is the The Inkey List Polyglutamic Acid Serum or the The Ordinary Marine Hyaluronics better?
Neither is clearly better — they overlap 70% on active ingredients and sit in the same price tier. The difference comes down to texture, finish and the supporting ingredients, so the right choice depends on your skin type and preferences.
What's the difference between the The Inkey List Polyglutamic Acid Serum and the The Ordinary Marine Hyaluronics?
Both are serums that share Hyaluronic Acid. Where they differ: the The Inkey List targets Dryness; the The Ordinary targets Oiliness.
Are the The Inkey List Polyglutamic Acid Serum and The Ordinary Marine Hyaluronics dupes for each other?
They share 70% active-ingredient overlap based on published INCI lists, so one can stand in for the other on the actives that matter — chiefly Hyaluronic Acid. A dupe matches the hero actives, not the full sensory experience, so expect differences in texture, fragrance and exact concentrations.
Can I use the The Inkey List Polyglutamic Acid Serum and The Ordinary Marine Hyaluronics together?
They both fill the serum slot in a routine, so you'd normally pick one rather than layer both. If you want to use both, treat one as your daytime option and the other for evening, and patch-test when introducing anything new.
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70% overlap

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