Ingredient guide
Polyglutamic Acid (PGA)
INCI name · polyglutamic acid
In short
Polyglutamic Acid (PGA) (also known as pga) is a skincare humectant generally associated with hydration. It is often chosen for dry, combination and sensitive skin. MIRU describes it by what is visible on skin, never as a treatment or cure.
Works forFrom reviewed ingredient data
Skin type
Dry · Combination · Sensitive
Best used
Anytime
What it is
A fermentation-derived polymer used as a film-forming humectant. Ingredient-specific human hydration evidence is not established; laboratory water-holding comparisons do not show superiority to hyaluronic acid on faces.
Evidence receipt
No linked study yet
No verified study is linked to this exact ingredient and route. The guidance below describes conventional use; it is not evidence of efficacy.
Where it sits
A watery layer. After cleansing, before anything heavier, ideally on slightly damp skin.
- Cleanse
- Tone
- Polyglutamic Acid
- Moisturise
- SPF
Also found as
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Check an ingredient listCommon questions
What does Polyglutamic Acid (PGA) do for skin?
Polyglutamic Acid (PGA) is generally associated with hydration. A fermentation-derived polymer used as a film-forming humectant. Ingredient-specific human hydration evidence is not established; laboratory water-holding comparisons do not show superiority to hyaluronic acid on faces. MIRU frames ingredients by what is visible, not by medical claims.
When should I use Polyglutamic Acid (PGA)?
Polyglutamic Acid (PGA) is typically used morning or evening. Introduce any new active on its own first and add one product at a time so you can see how your skin responds.
Is Polyglutamic Acid (PGA) suitable for my skin type?
Polyglutamic Acid (PGA) is often chosen for dry, combination and sensitive skin. It is generally considered well tolerated. If your skin is reactive, patch-test first and watch for any irritation.
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Personal guidance, not medical advice.