Chemical vs Physical Sunscreens: Understanding the difference (and why your skin reacts)

🌿 Physical Sunscreens: The Calm Protectors

Also known as: Mineral or natural sunscreens

Key ingredients: Zinc oxide, titanium dioxide

How they work:

Physical sunscreens create a protective barrier on the surface of your skin, reflecting and scattering UV rays away before they can cause damage. Think of them as tiny mirrors that deflect the sun.

Why they’re great for sensitive skin:

✅ Gentle and non-irritating

✅ Start protecting immediately after application

✅ Anti-inflammatory benefits (especially zinc oxide)

✅ Ideal for post-treatment or redness-prone skin

Because they sit on top of the skin rather than being absorbed, mineral sunscreens are less likely to cause stinging, itching, or redness — common reactions seen with chemical formulas.

🔥 Chemical Sunscreens: The Heat Absorbers

Also known as: Organic or synthetic sunscreens

Key ingredients: Oxybenzone, avobenzone, octocrylene, homosalate

How they work:

Chemical sunscreens absorb UV rays, convert them into heat, and then release that heat from the skin. They need around 20 minutes after application to become effective.

Potential issues for sensitive skin:

❌ The chemical reaction generates heat, which can trigger inflammation or sensitivity.

❌ Some chemical filters can penetrate deeper into the skin, potentially causing irritation or allergic reactions.

❌ Fragrance and alcohol (often added for texture) can worsen flare-ups.

If you notice stinging, redness, or small bumps after applying sunscreen — especially after treatments like peels, LED, or microneedling — a chemical sunscreen may be the culprit.

💡 Why This Matters for Your Skin Health

At Rejuvenate, we often see clients with post-treatment sensitivity, rosacea, or barrier dysfunction who unknowingly make their skin worse with the wrong sunscreen type. Switching to a physical (zinc-based) formula can dramatically reduce flare-ups and help calm the skin while still providing broad-spectrum protection.

✨ Our Professional Tip

If your skin is prone to redness, breakouts, or post-procedure heat, reach for a broad-spectrum mineral SPF — like the Ultraderm Daily Protector SPF 30+. It’s lightweight, non-comedogenic, and formulated for even the most sensitive skin types.

Remember, consistent sun protection isn’t just about avoiding burns — it’s about maintaining strong, healthy, and resilient skin every single day.