Ingredient Guide

Zinc

Also known as: Zinc PCA, Zinc Sulfate, Zinc Gluconate, Zinc Oxide, Zinc Chloride

OilyCombinationAcne-prone

What It Is

A mineral element used in skincare in multiple forms — zinc PCA, zinc sulfate, zinc gluconate — primarily for oil regulation, anti-inflammatory support, and mild antimicrobial action in blemish-prone and oily skin formulations.

What It Does

Zinc regulates sebaceous gland activity to reduce excess oil production, has mild anti-inflammatory and antibacterial properties that support blemish-prone skin, and in oxide form (zinc oxide) provides broad-spectrum mineral UV protection. In serums, it is typically used alongside niacinamide for combined oil-balancing and pore-support action.

Best For

Excess oilBlemish-prone skinLarge poresOily skinSkin clarifying routines

Benefits

  • Sebum regulation — reduces excess oil production in oily skin types
  • Anti-inflammatory — calms the inflammation around blemishes
  • Mild antimicrobial — inhibits acne-associated bacterial growth
  • Works synergistically with niacinamide for combined pore and oil support

When to Be Careful

  • Not a standalone acne treatment at low concentrations in serums
  • Zinc oxide in sunscreens can leave a white cast at higher percentages
ItGirlies Ingredient Intelligence
Why This Gets Hype

Zinc PCA paired with niacinamide became a standard combination for oily skin after The Ordinary popularized it in their Niacinamide 10% + Zinc 1% formula — a product that demonstrated the practical value of the combination for millions of users.

What People Often Misunderstand

Zinc in a serum is not the same as zinc oxide in SPF. The forms, functions, and concentrations differ significantly. Zinc in serums primarily addresses sebum regulation and anti-inflammatory support; zinc oxide in sunscreen provides UV filtration.

Best Routine Slot

Morning and/or evening in oily-skin and clarifying serums. No restriction on timing.

Good Match For

Oily, combination, and acne-prone skin needing oil regulation and mild clarifying support.

Proceed Carefully If…

No known concerns at standard serum concentrations.

Signs You May Be Overdoing It

Not applicable at normal skincare concentrations.

Commonly Found In

Clarifying SerumsOily Skin MoisturizersMineral SunscreensBlemish Spot Treatments

Products Containing Zinc

Balancing & Clarifying Serum
The Ordinary

FAQs About Zinc

What does zinc do in skincare serums?
In serums, zinc (typically zinc PCA or zinc gluconate) primarily regulates sebum production, provides mild anti-inflammatory action around blemishes, and works synergistically with niacinamide for oil and pore support.
Is zinc good for oily skin?
Yes — zinc is one of the most effective mineral ingredients for sebum regulation in oily skin. It reduces the rate of oil production by interacting with the sebaceous gland activity.
← Back to Product Decoder