Quick answer: the closest match for The Inkey List Polyglutamic Acid Serum is the Haruharu Wonder Black Rice Hyaluronic Serum: it shares Hyaluronic Acid, but not Polyglutamic Acid. Same price tier (Budget), so this is an alternative rather than a saving.
The contextWhy look for a Polyglutamic Acid Serum dupe?
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.
A good dupe isn't about a matching label — it's about matching the hero actives, the ingredients carrying the real work. For this serum that means Polyglutamic Acid, Hyaluronic Acid. The alternatives below are ranked by how many of those they match, then by price.
The matchesClosest alternatives
★ Closest match1 of 2
hero actives matched
BudgetHyaluronic Acid
Why it works: Shares Hyaluronic Acid, but not Polyglutamic Acid.
What's different: Same price tier (Budget), so this is an alternative rather than a saving. It also adds Niacinamide.
Full ingredient analysis → 1 of 2
hero actives matched
BudgetHyaluronic Acid
Why it works: Shares Hyaluronic Acid, but not Polyglutamic Acid.
What's different: Same price tier (Budget), so this is an alternative rather than a saving. It also adds Retinol.
Full ingredient analysis →1 of 2
hero actives matched
BudgetHyaluronic Acid
Why it works: Shares Hyaluronic Acid, but not Polyglutamic Acid.
What's different: Same price tier (Budget), so this is an alternative rather than a saving.
Full ingredient analysis →1 of 2
hero actives matched
BudgetHyaluronic Acid
Why it works: Shares Hyaluronic Acid, but not Polyglutamic Acid.
What's different: Same price tier (Budget), so this is an alternative rather than a saving. It also adds Niacinamide.
Full ingredient analysis →1 of 2
hero actives matched
BudgetHyaluronic Acid
Why it works: Shares Hyaluronic Acid, but not Polyglutamic Acid.
What's different: Same price tier (Budget), so this is an alternative rather than a saving.
Full ingredient analysis →1 of 2
hero actives matched
BudgetHyaluronic Acid
Why it works: Shares Hyaluronic Acid, but not Polyglutamic Acid.
What's different: Same price tier (Budget), so this is an alternative rather than a saving.
Full ingredient analysis →Common questions
What is the best dupe for The Inkey List Polyglutamic Acid Serum?
The closest match for The Inkey List Polyglutamic Acid Serum is the Haruharu Wonder Black Rice Hyaluronic Serum: it shares Hyaluronic Acid, but not Polyglutamic Acid. Same price tier (Budget), so this is an alternative rather than a saving.
Are Polyglutamic Acid Serum dupes really as good as the original?
A dupe matches the hero actives — the ingredients doing the measurable work — but rarely the full sensory experience. Texture, fragrance, supporting ingredients and exact concentrations differ, so treat a dupe as a value-led alternative rather than an identical copy.
How does Skin Stacker choose Polyglutamic Acid Serum dupes?
We look at products in the same category (serum) that share at least one of its hero actives (Polyglutamic Acid and Hyaluronic Acid), rank them by how many of its key treatment actives they match, then by price. Matches are based on published ingredient lists, not lab testing.
Compare them yourself
Head-to-headCompare this with…
Same-category picks that share at least one hero active — see ingredients, price and who each suits, side by side.
Showing the 6 closest of 8 comparisons.
Browse every comparison →Skin Stacker is independent and receives no payment from any brand. "Dupe" matches are based on publicly disclosed INCI lists and shared hero actives — not on side-by-side lab testing. A shared active profile does not guarantee an identical experience: texture, fragrance, supporting ingredients and concentrations all differ. Formulations change — always re-check the current label before buying.