Researched by Helena DeMaria-Williams
Formula IngredientSebum RegulatorZinc PCA
INCI: Zinc PCA
Zinc PCA is the zinc salt of pyrrolidone carboxylic acid (L-PCA), a compound found naturally in the skin as part of its natural moisturising factor (NMF). It combines the sebum-regulating and antimicrobial properties of zinc with the humectant and bioavailability-enhancing properties of L-PCA. It works by inhibiting the 5-alpha reductase enzyme that drives sebum overproduction, while also suppressing acne-causing bacteria such as Cutibacterium acnes.
Category
Sebum Regulator
Irritation Risk
Low
Skin Types
oily, combination, acne-prone, blemish-prone, mature skin
What does this do in a formula?
sebum regulation, antimicrobial, anti-acne, humectant, skin conditioning, anti-inflammatory, soothing, matifying, pore-clearing
Is Zinc PCA safe? Key considerations
Can Zinc PCA cause irritation?
Low RiskZinc PCA is generally well tolerated at cosmetic concentrations. Adverse reactions are uncommon, though sensitive skin types should patch test. Very high concentrations may increase irritation risk. No EU CosIng Annex II (prohibited) restrictions apply; listed under Annex III/24 (restricted ingredient — humectant/conditioning function). Not known to cause significant sensitisation.
Does Zinc PCA increase sun sensitivity?
No RiskZinc PCA does not increase photosensitivity. No additional sun protection is required solely due to this ingredient.
Is Zinc PCA safe during pregnancy?
CautionLimited clinical data exists on topical Zinc PCA use during pregnancy and breastfeeding. Systemic absorption through topical application is considered minimal, and no specific risks have been identified. However, due to the lack of robust safety data, it is advisable to consult a healthcare provider before use during pregnancy or nursing (Motherfigure; no CIR safety report found as of 2026).
How does Zinc PCA work?
Zinc PCA is the zinc salt of pyrrolidone carboxylic acid (L-PCA), a compound found naturally in the skin as part of its natural moisturising factor (NMF). It combines the sebum-regulating and antimicrobial properties of zinc with the humectant and bioavailability-enhancing properties of L-PCA. It works by inhibiting the 5-alpha reductase enzyme that drives sebum overproduction, while also suppressing acne-causing bacteria such as Cutibacterium acnes.
Individuals with known zinc allergy should review the considerations above before use.
Which products contain Zinc PCA?
Shop products that contain Zinc PCA
Supersize Salicylic Acid Cleanser
360° Skin Clearing Serum
Salicylic Acid Cleanser
Beta Hydroxy Acid (BHA) Serum
20% Niacinamide Serum
