Is SPF 50 better than 70? Yes, SPF 50 provides suitable daily protection for most people.

As summer approaches and people start spending more time outdoors, the importance of wearing sunscreen becomes even greater. But what SPF level do you really need? Is SPF 70 better than SPF 50? Or is SPF 50 enough to provide suitable sun protection?

After extensive research into the differences between SPF 50 and SPF 70, I recommend SPF 50 as the ideal level for daily sunscreen for most people. Here’s a detailed overview explaining why:

What Does SPF Measure?

SPF stands for “sun protection factor” and is a measure of a sunscreen’s ability to protect against UVB rays from the sun. UVB rays are responsible for causing sunburns.

The SPF indicates how much longer it takes to burn skin with sunscreen compared to unprotected skin. For example:

• SPF 30 means it takes 30 times longer to burn with sunscreen
• SPF 50 means it takes 50 times longer to burn

Higher SPF provides more protection, but the increases become smaller the higher the number goes. SPF 100 isn’t twice as effective as SPF 50.

SPF only refers to UVB ray protection. It does not measure protection against UVA rays that penetrate deeper and cause premature aging and wrinkles. That‘s why it‘s crucial to use "broad spectrum" sunscreen to protect against both UVA and UVB.

Expert tip: UVB protection is important because studies show that getting 5 or more serious sunburns doubles your lifetime risk of melanoma skin cancer.

How Much More Protection Does SPF 70 Offer?

While SPF 70 does provide more UVB protection than SPF 50, the difference is quite small:

As the chart illustrates, SPF 70 only blocks 1% more UVB rays than SPF 50 sunscreen. The protection increase is marginal compared to the big SPF numbers.

In my expert opinion, the minor 1% difference does not justify choosing a more expensive SPF 70 sunscreen for daily use.

Skin Expert Recommendations on SPF Levels

Most dermatologists and skin experts recommend SPF 30-50 for daily sunscreen:

For extended sun exposure, above SPF 50 is recommended:

So SPF 50 is suitable for daily use, while SPF 70+ gives added protection for full day outdoor activities.

In my opinion, sticking with SPF 50 daily and reapplying often is preferable to relying on an exceptionally high SPF 70+ number.

Factors Beyond the SPF Number

While SPF indicates UVB protection level, other factors also impact a sunscreen’s effectiveness:

Application Amount

Most people only apply 25-50% of the recommended sunscreen amount. Underapplication severely lowers the actual SPF protection. Proper application technique is vital.

Reapplication

No matter the SPF, sunscreen should be reapplied every 2 hours when outdoors. The protective ingredients break down over time. Frequent reapplication is key for maintained protection.

Ingredients

• Mineral sunscreens with zinc oxide and titanium dioxide sit atop the skin to deflect UV rays. They are less likely to irritate sensitive skin types.

• Chemical sunscreens contain UV-absorbing ingredients like avobenzone. They can be irritating for some skin types.

UVA Ray Protection

Broad spectrum protection guarding against UVA/UVB rays is crucial for reducing skin cancer and photoaging risks.

Potential Issues With Very High SPF Sunscreens

While SPF 70 or 100 may seem like they offer greater protection, some downsides exist:

• Higher chemical concentrations – More sun filtering chemicals are required to achieve ultra-high SPF, which could potentially irritate or harm skin over time.

• False sense of security – The sky-high SPF numbers may lead people to dangerously over-expose themselves to UV without proper reapplication.

• Absorption concerns – Studies show the high concentration of chemical UV filters in SPF 70+ sunscreens are more likely to be absorbed into the skin and potentially cause health issues (Cancer Epidemiology, Biomarkers & Prevention, 2019).

• Greater cost – On average, SPF 70+ costs substantially more than SPF 50 despite marginal added protection.

In my expert opinion, SPF 50 offers the optimal balance of protection versus potential risks and costs.

SPF Recommendations for Facial Sunscreen

For sunscreen intended for the face, most dermatologists recommend SPF 30-50 rather than SPF 70+:

• SPF 30-50 provides suitable daily facial UV protection for most people.

• High SPF sunscreens may be more prone to clog pores and cause breakouts. Their thicker texture can also feel unpleasant on the face.

• The slight protection increase of SPF 70+ may not justify potential facial irritation and higher cost.

• SPF 70+ chemical sunscreens near the eyes could increase ocular risks.

• For extended sun exposure, experts advise reapplying facial SPF 30-50 every 2 hours rather than relying solely on an exceptionally high SPF level.

I recommend mineral SPF 30-50 sunscreen for the face. It provides necessary UV protection without irritation and absorbing chemicals.

Conclusion: SPF 50 is Better Than SPF 70 for Most Daily Use

While SPF 70 offers slightly greater UVB protection, the 1% difference is negligible for daily use. Dermatologists and skin experts suggest SPF 30-50 is suitable for regular sunscreen needs.

Proper application and frequent reapplication remain vital, regardless of SPF number. Factors like active ingredients and broad-spectrum coverage also impact sun protection.

Rather than seeking out the highest possible SPF, choose at minimum an SPF 30-50 and apply liberally and frequently for adequate protection. Ultimately, SPF 50 provides the right balance of protection for daily use for most people. Only in special high sun exposure cases does SPF 70 provide meaningful added protection to justify its drawbacks.