Compare · Ingredients

Niacinamide vs Zinc Oxide

Niacinamide: Supports barrier function, uneven tone and oiliness. Zinc Oxide: Provides UV protection in tested sunscreens and wetness protection in barrier creams.

Research updated 2026-10-25

Six niacinamide products on white, including The Ordinary 10% + Zinc 1%, Paula's Choice Booster and EltaMD UV Clear

Four mineral sunscreens on white: Native SPF 30, Thinksport SPF 50, Colorescience Flex and EltaMD UV Clear

Which one?At a glance What it helps Diagrams Using both Strengths Results Safety How it works Products Questions

Which one is right for you?

Choose Niacinamide if…

Choose for barrier support, uneven tone and oiliness; often the gentler starting point.

Barrier support or sensitive skin
Uneven tone or oiliness
You want a gentle, stable starting point

Choose Zinc Oxide if…

Choose a broad-spectrum sunscreen you will use consistently, or a labelled barrier paste for wetness.

Sensitive skin or melasma
Broad UVA and UVB protection
Diaper or friction areas

Fine together

Can you use both?

Apply niacinamide first, then zinc sunscreen as the last step.

At a glance

● Niacinamide

● Zinc Oxide

Type

Vitamin B3 (nicotinamide)

Mineral UV filter and skin protectant

What it does

Supports the barrier and improves uneven tone

Provides UV protection in tested sunscreens and wetness protection in barrier creams.

Best for

Barrier support; uneven tone; oiliness

Sunburn; Diaper Rash; Melasma; Wrinkles and Fine Lines

Studied concentrations

2–5%

Use a tested sunscreen by its broad-spectrum SPF; barrier pastes are different products.

When to use

Morning or night

Each morning and before sun exposure.

Time to results

About 4–12 weeks, depending on the concern

Protection with correct application; prevention continues over time

Irritation

Usually low; stinging or redness can occur

May leave a white cast or feel heavy; other formula ingredients can irritate.

Sensitive skin

Often suitable in a gentle formula

Choose a simple formula and test a small area first. Individual tolerance matters more than an ingredient’s reputation for being gentle.

Available

Over the counter

Prescription or cosmetic status depends on the active, formula and country; check the label.

What it helps

Compare uses by strength of evidence. Evidence level describes confidence in a benefit, not its size.

Evidence level

Niacinamide

Zinc Oxide

Strong evidenceMost established uses

—

Sunburn: 1. Sunburn Header — Light Skin; Lighter skin.

Sunburn

A correctly used tested sunscreen helps prevent UV sunburn.

Moderate evidenceSome supportive research

a very close view of irritated dry skin with fine flaking and no identifiable body part on light skin.

Barrier Support

Supports barrier lipids and helps reduce water loss in dry skin.

A relaxed forehead with faint shallow horizontal fine lines.

Wrinkles and Fine Lines

A small controlled trial of 5% niacinamide found modest improvement in fine lines.

Uneven Skin Tone.

Uneven Skin Tone

Can improve uneven pigmentation with regular use and sun protection.

Oiliness.

Oiliness

2% niacinamide improved some measures of facial oiliness in controlled studies.

A relaxed forehead with faint shallow horizontal fine lines.

Wrinkles and Fine Lines

Regular sunscreen helps prevent further photoaging rather than erase existing folds.

Flat tan patches with soft irregular edges across the forehead and upper cheek of an adult with light skin, the surface completely smooth.

Melasma

Sun protection supports melasma care; tinted formulas may add visible-light protection.

Diaper Rash, close-up of representative skin findings.

Diaper Rash

Labelled zinc-oxide pastes protect skin from wetness and friction.

Limited evidenceEarly or small studies

Inflamed acne on light skin. The spots sit in a patch of pink, and the ring of redness around each one is easy to see. A few have a yellow-white head, and the skin between them is dry and flaking.

Acne

Small trials suggest benefit for inflammatory acne; consider it a supporting option.

Flat tan patches with soft irregular edges across the forehead and upper cheek of an adult with light skin, the surface completely smooth.

Melasma

A small trial of 4% niacinamide found improvement alongside sunscreen.

Redness and fine superficial vessels across a light-skinned cheek and nose.

Rosacea

A niacinamide moisturizer was studied for barrier support; its other ingredients also matter.

—

Insufficient evidence

Enlarged Pores on light skin.

Enlarged Pores

Less oil may make pores less noticeable; lasting pore-size reduction is unproven.

Extreme close-up of light skin in an active eczema flare, too close to tell which part of the body it is. Blotchy pink-red inflammation covers the whole frame with no clear edge, with small raised bumps, fine dry scale and a few fresh scratch marks.

Eczema

Barrier benefits do not establish niacinamide as an eczema treatment.

A relaxed forehead with pronounced deep horizontal furrows.

Deep Wrinkles

Fine-line improvement does not establish correction of deep folds.

Inflamed acne on light skin. The spots sit in a patch of pink, and the ring of redness around each one is easy to see. A few have a yellow-white head, and the skin between them is dry and flaking.

Acne

The reviewed sources do not establish this ingredient as a treatment for this concern.

Redness and fine superficial vessels across a light-skinned cheek and nose.

Rosacea

The reviewed sources do not establish this ingredient as a treatment for this concern.

How it works

Niacinamide mechanism diagram. Supports the skin barrier: Helps skin make lipids that reduce water loss. Reduces pigment transfer: Less pigment reaches neighboring skin cells. — Open full-size diagram
Diagram explanation and sources
Supports the skin barrier: Helps skin make lipids that reduce water loss. Reduces pigment transfer: Less pigment reaches neighboring skin cells.
Schematic illustration; not a measurement of skin penetration. Effects vary with ingredient identity and formulation.
Source 1 · Source 2 · Source 3 · Source 4

Zinc Oxide mechanism diagram. Absorbs and scatters UV: Particles act in a film at the skin surface. The full sunscreen matters: Broad-spectrum protection depends on the formula. — Open full-size diagram
Diagram explanation and sources
Absorbs and scatters UV: Particles act in a film at the skin surface. The full sunscreen matters: Broad-spectrum protection depends on the formula.
Schematic illustration; not a measurement of skin penetration. Effects vary with ingredient identity and formulation.
Source 1 · Source 2 · Source 3 · Source 4

Using both in one routine

Built from where each one usually sits in a routine. Introduce one at a time.

Morning

Step 1

Cleanser

Step 2

NiacinamideMorning or night

Step 3

Moisturizer

Step 4

Zinc OxideMorning

Night

Step 1

Cleanser

Step 2

NiacinamideMorning or night

Step 3

Moisturizer

Strengths and forms

Concentrations

Clinical studies commonly use 2–5% niacinamide for particular concerns. Higher marketed strengths are not a proven upgrade for everyone.

2%

4–5%

10%

Studied for facial oiliness

Controlled studies tested a finished formula for measures of facial oiliness; results do not mean every oily skin needs niacinamide.

Studied for tone and skin aging

Different trials studied pigmentation, melasma or fine lines. The concern and finished formula matter.

Higher marketed concentration

Available in skincare, but not established as universally more effective than the lower studied strengths.

Choosing a strength: A comfortable 2–5% product is a reasonable place to look when choosing for the studied concerns; evaluate the complete formula.

Higher strengths: Higher percentages may sting or irritate some skin. Do not keep increasing the concentration when the product causes discomfort.

Formula matters: Niacinamide is also included in moisturizers without a stated percentage. That does not mean the moisturizer cannot support skin comfort.

Zinc oxide sunscreen and thick barrier ointment have different jobs. U.S. sunscreen concentrations can be up to 25%; some skin-protectant ointments use more than 25% through 40%.

25%

25–40%

U.S. sunscreen ceiling

The permitted upper concentration is not an SPF rating. Choose a finished sunscreen by its tested protection.

Higher skin-protectant ointments

The monograph specifies more than 25% through 40% in ointments. These barrier products are not automatically sunscreens.

Choosing a strength: For sun protection, choose a tested broad-spectrum sunscreen with appropriate SPF. For a barrier ointment, choose its labeled protective purpose.

Higher strengths: More zinc oxide alone does not prove higher SPF, better UVA coverage or a better diaper-rash result.

Formula matters: Particle characteristics, dispersion and the full formula affect protection and feel. An unlabeled zinc paste should not be substituted for sunscreen.

Forms

Serum · Moisturizer · Toner

Sunscreen · Tinted sunscreen · Barrier paste

When you’ll see results

Approximate windows, not promises.

● Niacinamide

● Zinc Oxide

First few weeks

First few weeksAssess comfort. Moisturizer benefits may appear before changes in tone or lines.

First few weeksProtection starts with correct application; it does not require a weeks-long course.

4–8 weeks

4–8 weeksOiliness or uneven pigmentation may begin to improve.

4–8 weeksConsistency matters; this is prevention, not a spot-clearing treatment.

8–12 weeks

8–12 weeksReassess tone and fine lines; expect modest changes.

8–12 weeksContinue correct application and reapplication.

3–6 months

3–6 monthsContinue if it helps and remains comfortable.

3–6 monthsMonitor tolerance and sun exposure; a changing spot needs assessment.

6–12 months

6–12 monthsLong-term benefit is less well defined than short-term results.

6–12 monthsPhotoaging prevention is a long-term benefit, not a promise of wrinkle reversal.

Safety and sensitive skin

Common reactions

Stinging, redness, dryness or a rash can occur. Fragrance, preservatives and other ingredients may also contribute to a reaction.

May leave a white cast or feel heavy; other formula ingredients can irritate.

When to stop

Stop for persistent burning, swelling or an itchy rash. Seek urgent help for trouble breathing or rapidly worsening facial swelling.

Stop for persistent burning, swelling, blistering or a new rash. Seek urgent care for breathing difficulty or a severe allergic reaction.

Sensitive or inflamed skin

Choose a gentle formula and test a small area. Barrier-support claims do not mean every product suits rosacea or eczema.

Choose a simple formula and test a small area first. Individual tolerance matters more than an ingredient’s reputation for being gentle.

Pregnancy & breastfeeding

This topical ingredient is not a retinoid. Review the complete product with your clinician; do not assume every combination formula is suitable.

Not covered in this guide yet

Important limits

Niacinamide supports skincare; it does not replace diagnosis or established treatment of persistent acne, melasma or an inflamed rash.

Do not use a cosmetic product as a substitute for diagnosis of an unexplained, changing or persistent skin problem.

Pregnancy

Not covered in this guide yet

Mineral sunscreens are generally considered acceptable in pregnancy.

How it works

In the skin

On the skin. A water-soluble vitamin used in serums and moisturizers.

Entering skin. Human studies show delivery into the outer skin; uptake depends on the formula.

Conversion. Cells use niacinamide to help make NAD+, which supports energy and repair.

Skin response. Supports production of barrier lipids, including ceramides, and helps reduce water loss.

Additional effects. Reduces pigment transfer between skin cells in laboratory models.

On the skin. The finished product delivers zinc oxide in a particular vehicle.

Entering skin. Formula-unit mass is not particle size. These mineral particles act in the surface sunscreen film; the 500 Da guideline does not predict particle penetration.

Conversion. No activation step is established as necessary for its intended topical role.

Skin response. Particles absorb and scatter UV at or near the surface; barrier pastes also shield skin from moisture and friction.

Additional effects. Proposed pathways do not establish a measured depth of delivery or clinical benefit beyond the studies cited.

Getting in

Below the 500 Da guideline. Human studies show that the formula strongly affects uptake.

Formula-unit mass is not particle size. These mineral particles act in the surface sunscreen film; the 500 Da guideline does not predict particle penetration.

Molecule size

Niacinamide · 122 Da

Zinc Oxide · 81 Da

Smaller than 500 Da passes the outer skin more easily. Size isn’t an effectiveness score.

500 Da guideline

Product examples

Niacinamide

The Ordinary Niacinamide 10% + Zinc 1% — Budget serum.
Paula’s Choice 10% Niacinamide Booster — Mixes into moisturizer.
CeraVe PM Facial Moisturizing Lotion — Niacinamide plus ceramides.

Zinc Oxide

ROUND LAB Birch Juice Sun Cushion — A zinc oxide sunscreen in a cushion compact, made for reapplying over makeup. Unlike much of the K-beauty sun market, this one is sold here by the brand itself.
Vanicream Facial Moisturizer SPF 30 — Fragrance-free mineral sunscreen — 19.5% zinc oxide, five ceramides. Cheap, boring, built for reactive skin.
EltaMD UV Clear Tinted — The same formula as EltaMD UV Clear, with iron oxides added for a sheer tint. The tint cancels the white cast — up to a point.

Common questions

Niacinamide:Does niacinamide help fine lines?

There is clinical evidence, including a small 12-week controlled trial of a 5% moisturizer. Expect modest improvement; it does not erase deep wrinkles.

Niacinamide:Is 10% better than 5%?

Not necessarily. Many clinical studies used 2–5%, and a higher concentration is not proven to work better for every concern.

Niacinamide:Can niacinamide treat acne by itself?

Small trials suggest benefit, but the evidence is limited. Persistent, painful or scarring acne needs an established acne treatment plan.

Niacinamide:Does niacinamide permanently shrink pores?

That has not been established. Less oil or a smoother appearance can make pores look less obvious without permanently changing their structure.

Niacinamide:Why does my niacinamide product sting?

The concentration, other ingredients or your skin barrier may be responsible. Reduce use or stop if irritation persists; you do not need to push through it.

Zinc Oxide:What should I choose zinc oxide for?

Choose a broad-spectrum sunscreen you will use consistently, or a labelled barrier paste for wetness.

Zinc Oxide:How strong is the evidence?

Sun protection is established for tested sunscreen products, not loose zinc powder. Formula-unit mass is not particle size. A sunscreen ageing trial cannot isolate zinc oxide or prove reversal of existing wrinkles.

Sources

Sources and further reading

Dermapedia on YouTube