SPF 65.8 Verified: Why We Test Our Sunscreen

When we launched CMe Ultra-Light Refreshing Facial Sunscreen SPF50+ PA++++, we made one commitment: no claims without proof. That's why we submitted our sunscreen formula to Solar Test Asia, an independent in-vivo testing laboratory, for third-party SPF certification under ISO standards.

What Does SPF Really Mean?

SPF (Sun Protection Factor) measures how long a product protects your skin from UVB rays compared to unprotected skin. An SPF 50 product theoretically allows you to stay in the sun 50 times longer than without protection.

But here's the catch: many brands claim SPF 50+ without independent in-vivo verification on real human skin. It's often a marketing number based on in-vitro calculation, not a tested number.

Our Testing Process

We submitted CMe Ultra-Light Refreshing Facial Sunscreen to Solar Test Asia for clinical testing under ISO 24444:2010 — the international standard for in-vivo SPF determination on human volunteers. Protocol:

1. In-vivo SPF (ISO 24444:2010) — Minimal Erythema Dose (MED) measured on n=10 human volunteers
2. In-vivo UVA PF (ISO 24442) — UVA protection measured on the same panel
3. Water Resistance (ISO 16217) — 40-minute water-resistant claim verified

The Results: SPF 65.8

Study ID: IV202602009 · n=10 panelists · Solar Test Asia (Thailand)

| Measurement | Result | Standard | |---|---|---| | SPF (in-vivo) | 65.8 | ISO 24444:2010 | | UVA PF | 24.7 | ISO 24442 | | Water Resistance | 40 minutes | ISO 16217 |

Why we claim only SPF 50+ on the label: Thai FDA (อย.) regulations cap on-label SPF claims at "50+" — claiming a specific number above 50 is not permitted regardless of the lab result. We chose Honest Numbers: publish the verified 65.8 in our science section, claim 50+ on the bottle.

Why This Matters

A sunscreen that tests at SPF 30 but claims SPF 50 is underperforming. A sunscreen that tests at SPF 65.8 and claims SPF 50+ is conservative and trustworthy.

When you choose CMe, you're choosing verified protection. No marketing fluff. Just science.

Next Steps for Your Sunscreen Routine

• Apply 1/4 teaspoon (1.25ml) to face daily
• Reapply every 2 hours if swimming or sweating
• Use 15 minutes before sun exposure
• Works with all CMe serums and cleansers

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📚 อ่านเพิ่มเติมใน CMe Wiki

• SPF PA คืออะไร
• วิธี Patch Test ที่ถูกต้อง
• Trial Size ทดลองก่อน

Your skin deserves protection you can trust. That's the CMe promise.