Quick answer: the closest dupe for the The Inkey List Polyglutamic Acid Serum is the Haruharu Wonder Black Rice Hyaluronic Serum — 70% active overlap, sharing Hyaluronic Acid. Similar price, so compare on the base, supporting actives and texture rather than cost. Note the original also carries Polyglutamic Acid.
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 share that profile; where they differ is in texture, supporting ingredients and finish.
The matchesClosest alternatives
★ Closest matchBudgetHyaluronic Acid
Why it works: Built on the same hero actives — Hyaluronic Acid — which is what drives results in a serum.
What's different: Similar price, so compare on the base, supporting actives and texture rather than cost. Note the original also carries Polyglutamic Acid.
Full ingredient analysis → BudgetHyaluronic Acid
Why it works: Built on the same hero actives — Hyaluronic Acid — which is what drives results in a serum.
What's different: Similar price, so compare on the base, supporting actives and texture rather than cost. Note the original also carries Polyglutamic Acid.
Full ingredient analysis →BudgetHyaluronic Acid
Why it works: Built on the same hero actives — Hyaluronic Acid — which is what drives results in a serum.
What's different: Similar price, so compare on the base, supporting actives and texture rather than cost. Note the original also carries Polyglutamic Acid.
Full ingredient analysis →BudgetHyaluronic Acid
Why it works: Built on the same hero actives — Hyaluronic Acid — which is what drives results in a serum.
What's different: Similar price, so compare on the base, supporting actives and texture rather than cost. Note the original also carries Polyglutamic Acid.
Full ingredient analysis →BudgetHyaluronic Acid
Why it works: Built on the same hero actives — Hyaluronic Acid — which is what drives results in a serum.
What's different: Similar price, so compare on the base, supporting actives and texture rather than cost. Note the original also carries Polyglutamic Acid.
Full ingredient analysis →BudgetHyaluronic Acid
Why it works: Built on the same hero actives — Hyaluronic Acid — which is what drives results in a serum.
What's different: Similar price, so compare on the base, supporting actives and texture rather than cost. Note the original also carries Polyglutamic Acid.
Full ingredient analysis →Common questions
What is the best dupe for the The Inkey List Polyglutamic Acid Serum?
The closest alternative in our catalogue is the Haruharu Wonder Black Rice Hyaluronic Serum, which shares Hyaluronic Acid and scores 70% on active-ingredient overlap. Similar price, so compare on the base, supporting actives and texture rather than cost. Note the original also carries Polyglutamic Acid.
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 match products in the same category (serum) that share hero actives (Polyglutamic Acid, Hyaluronic Acid), then rank by overlap and price. Matches are based on published INCI lists, not lab assays.
Compare them yourself
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.