What SPF Should I Use?

You should use at least SPF 30 for sun protection.

Using sunscreen is a critical step in protecting your skin from the sun's damaging ultraviolet (UV) radiation, specifically UVA and UVB rays. Consistent use helps reduce the risk of negative side effects from sun exposure.

Recommended Sun Protection Factor (SPF)

Based on expert recommendations, a minimum SPF level is advised for most people engaging in outdoor activities.

• Adults: Adults of all ages and skin colors should use at least an SPF of 30 during all outdoor activities.
• Children: Children over 6 months old should wear a cream-based sunscreen of at least SPF 30.

This recommendation is based on information suggesting that SPF 30 provides a significant level of protection against UVB rays, which are the primary cause of sunburn.

Understanding SPF

SPF stands for Sun Protection Factor. It's a measure of how much solar energy (UV radiation) is required to produce sunburn on protected skin (with sunscreen) relative to the amount of solar energy required to produce sunburn on unprotected skin.

• SPF 15: Blocks about 93% of UVB rays.
• SPF 30: Blocks about 97% of UVB rays.
• SPF 50: Blocks about 98% of UVB rays.

While higher SPFs offer marginally more protection against UVB, the difference above SPF 30 is relatively small. No sunscreen offers 100% protection.

Practical Tips for Sunscreen Use

Choosing the right SPF is just the first step. Effective sun protection also involves proper application and other sun safety measures:

1. Apply Generously: Use enough sunscreen to cover all exposed skin. Most adults need about one ounce (a shot glass full) for their entire body.
2. Apply Before Exposure: Apply sunscreen at least 15-30 minutes before going outside to allow it to bind to the skin.
3. Reapply Often: Reapply sunscreen at least every two hours, or more often if swimming or sweating heavily.
4. Choose Broad-Spectrum: Ensure your sunscreen is "broad-spectrum," meaning it protects against both UVA and UVB rays.
5. Consider Other Factors: While SPF 30 is the minimum, factors like your skin type, location (altitude, proximity to the equator), time of day, and planned activities (e.g., water sports) might warrant a higher SPF for added peace of mind.
6. Don't Rely Solely on Sunscreen: Combine sunscreen use with other protective measures like seeking shade, wearing sun-protective clothing (long sleeves, pants), wide-brimmed hats, and sunglasses.

Adhering to the minimum SPF 30 recommendation helps significantly reduce your risk of sun damage during typical outdoor activities.