How to Choose Sunscreen: The Complete Buying Guide

Choosing sunscreen: mineral vs chemical, SPF number, reapplication, ingredients to avoid. Here's how to pick the right SPF for your skin and lifestyle.

Last updated 2026-04-13 · 5 min read · First published 2026-04-13

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The short answer

Choose sunscreen based on: 1) SPF 30-50+ (higher for outdoor, 30+ minimum). 2) Mineral (zinc/titanium) for sensitive/pregnancy; chemical for elegant feel. 3) Broad-spectrum (UVA + UVB). 4) Formula for your skin: gel for oily, cream for dry, tinted for melasma. 5) Reapplication, every 2 hours outdoors. Derm favorites: EltaMD UV Clear, EltaMD UV Physical Tinted, CeraVe Hydrating Mineral.

The 5 factors that matter

The short answer

Sunscreen selection factors: 1) SPF number (30-50+ ideal). 2) Mineral vs chemical filter. 3) Broad-spectrum (UVA + UVB). 4) Formula match to skin type. 5) Tinted or not (iron oxides for visible light). Match these to your lifestyle + skin type + concerns.

1. SPF number

The short answer

SPF numbers: SPF 15 blocks ~93% UVB. SPF 30 blocks ~97%. SPF 50 blocks ~98%. SPF 100 blocks ~99%. Diminishing returns beyond SPF 50, but higher SPF compensates for real-world under-application. Most dermatologists recommend minimum SPF 30 daily, SPF 50+ for outdoor/active days.

SPF ladder:

SPF 15: 93% UVB (insufficient for most)
SPF 30: 97% (minimum daily)
SPF 50: 98% (ideal daily)
SPF 50+: 98-99% (best for active lifestyle)

2. Mineral vs chemical

The short answer

Mineral (zinc oxide, titanium dioxide): physical blocker. Safer for pregnancy, sensitive skin, reef safe. Can leave white cast (tinted versions solve this). Chemical (avobenzone, octisalate, octinoxate): absorbs UV. More cosmetically elegant. Safety debate around certain filters (oxybenzone). Both effective; choose based on preference + skin.

Mineral advantages:

Pregnancy-safe
Reef-safe
Less systemic absorption
Immediate protection

Chemical advantages:

No white cast
Cosmetically elegant
Thinner application
Better for makeup wear

3. Broad-spectrum essential

The short answer

Broad-spectrum = protects against UVA (aging) + UVB (burning). Both damage skin. Modern sunscreens should be broad-spectrum; older formulas sometimes only covered UVB. Check label for “broad-spectrum” or PA+++ rating (Asian sunscreens). Non-broad-spectrum SPF is essentially missing protection.

Look for:

“Broad-spectrum” on US labels
PA+++/++++ on Asian labels
Avoid SPF without broad-spectrum claim

4. Match formula to skin type

The short answer

Sunscreen formula by skin type: Oily/acne-prone (gel or lightweight fluid (Biore UV Aqua Rich, Supergoop Unseen). Dry) cream formulas (EltaMD UV Restore, SkinMedica Total Defense). Sensitive, 100% mineral (La Roche-Posay Anthelios Mineral). Combination, hybrid mineral-chemical (EltaMD UV Clear). Melasma-prone, tinted with iron oxides (EltaMD UV Physical Tinted).

Top sunscreen picks by skin type

For most people (derm favorite)

Premium Beauty

EltaMD

UV Clear SPF 46

Under $50

Zinc + niacinamide hybrid.

Best for: Most skin types, daily wear

"The single most derm-recommended sunscreen."

Check price on Amazon →

For oily skin / invisible feel

Best value

Biore

UV Aqua Rich Watery Essence SPF 50

Under $25

Weightless Japanese chemical SPF. Invisible finish, layers under anything.

Best for: Oily skin, makeup wearers, zero white cast

"The under-$25 daily SPF that disappears on skin."

Check price on Amazon →

For sensitive/pregnancy

Derm favorite

La Roche-Posay

Anthelios Mineral SPF 50

Under $50

Pure mineral, pregnancy-safe.

Best for: Pregnancy, reactive skin, melasma

"The sensitive skin mineral standard."

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For melasma (iron oxides)

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EltaMD

UV Physical Tinted SPF 41

Under $50

100% mineral, tinted with iron oxides for visible-light defense.

Best for: Melasma, hyperpigmentation, sensitive skin

"The melasma-protective tinted mineral SPF derms reach for."

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For active/outdoor lifestyle

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EltaMD

UV Sport SPF 50

Under $50

Water-resistant 80 min.

Best for: Outdoor sports, beach, hiking

"The athletic sunscreen standard."

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5. Reapplication rules

The short answer

Sunscreen reapplication: every 2 hours in sun, immediately after swimming/heavy sweating, after 80 minutes of water activity (water-resistant formulas). Desk workers indoor: once daily often enough (UVA still penetrates windows). Spray or powder formulas (Supergoop Play Mist, Colorescience Sunforgettable) practical for reapplication over makeup.

Reapplication:

Every 2 hours in direct sun
After swimming immediately
After heavy sweating (workouts)
Water-resistant 80 min labels = reapply after that

Ingredients to avoid in sunscreen

The short answer

Sunscreen ingredients to avoid: oxybenzone (some endocrine disruption concerns, reef-damaging), octinoxate (similar concerns, banned in Hawaii/Palau). Avoid if: pregnant, reef-safety priority, children. Still FDA-approved but many switch to alternatives. Mineral filters (zinc/titanium) avoid all these concerns.

Consider avoiding:

Oxybenzone
Octinoxate (in certain markets)

These are FDA-approved but have environmental + pregnancy concerns.

Frequently asked

Is SPF 100 worth it over SPF 50? +

Slightly better real-world protection due to typical under-application. SPF 100 compensates when you apply only 50% of recommended amount. For outdoor people, yes. Desk workers, SPF 30-50 is plenty.

Can I skip sunscreen in winter? +

No. UVA penetrates clouds + windows. Winter UV still damages skin. Daily SPF year-round.

Mineral vs chemical, which is better? +

Both effective. Mineral safer for sensitive skin, pregnancy. Chemical more cosmetically elegant. Personal preference after effectiveness.

How much sunscreen should I apply? +

1/4 teaspoon for face, 1 oz for body. Most people apply 25% of this, getting SPF 10 from SPF 50.

Does SPF in makeup count? +

Usually insufficient. SPF in foundation/primer tested at thick application; typical makeup use is too thin. Apply dedicated SPF underneath.

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