Products › Serum › The INKEY List Polyglutamic Acid Serum
Polyglutamic Acid Serum
Polyglutamic Acid Serum is middling — some recognized actives, but dosing or disclosure holds it back.
Actives pyramid
What's actually in it, ranked by how well it's dosed.
What it does
Evidenced benefit intensity, derived from dosed actives.
The receipt
Every point of this grade, traced to the active, its dose, and the evidence.
Polyglutamic Acid at 3% — strong dose
Above the ~1% where A microbial biopolymer humectant that forms a water-trapping film on skin; a clinical study found 0.2% polyglutamic acid gave moisturizing effects superior to 5% glycerol, with typical use levels of 0.1-1%.
Pros & cons
The honest tradeoffs.
- Polyglutamic Acid at a strong, research-backed dose (3%)
Best for
Who and when this fits.
Dupes & alternatives
Cheaper products in the same category that grade equal or higher.
B The Ordinary Niacinamide 10% + Zinc 1%$6
save 65% B The Ordinary Niacinamide 10% + Zinc 1% Oil Control Serum
$6
save 65% B Minimalist Niacinamide 5% + Hyaluronic Acid 1% Face Serum
$11.99
save 29% B The Ordinary Resveratrol 3% + Ferulic Acid 3%
$12
save 29%
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Get Visage VerifiedBased on published concentration thresholds and formulation science. Our algorithm predicts likely efficacy — it does not test the product. Individual results vary. Not evaluated by the FDA. You can't pay to move a grade — Visage Theory is paid only for optional audits and seal licenses, never to change a letter.